diff --git a/docs/markdown-workflows.md b/docs/markdown-workflows.md
new file mode 100644
index 0000000..626ff09
--- /dev/null
+++ b/docs/markdown-workflows.md
@@ -0,0 +1,102 @@
+# Markdown Workflows
+
+Markitect workflows provide declarative orchestration for Markdown-centered
+document pipelines.
+
+Use them when you want to:
+
+- collect Markdown files, globs, or directories
+- extract frontmatter, sections, blocks, metrics, or selector results
+- bind named data products into later steps
+- run deterministic template/compose/transform/include steps
+- define optional assisted-generation boundaries without requiring a provider
+- write one or more Markdown outputs with provenance and diagnostics
+
+The workflow definition standard is documented in
+`docs/workflow-definition-standard.md`.
+
+## Commands
+
+Inspect a workflow definition:
+
+```text
+mkt workflow inspect examples/workflows/adr-release-notes.workflow.md
+```
+
+Plan a run without writing outputs:
+
+```text
+mkt workflow plan examples/workflows/adr-release-notes.workflow.md
+```
+
+Run and write outputs:
+
+```text
+mkt workflow run examples/workflows/adr-release-notes.workflow.md --output-dir build
+```
+
+JSON/YAML output is available for agents:
+
+```text
+mkt workflow run workflow.md --format json
+```
+
+## Execution Model
+
+The first runner is deterministic and local-first:
+
+1. Load a YAML or Markdown-fenced workflow definition.
+2. Validate required ids/kinds and duplicate step ids.
+3. Collect inputs from Markdown files, directories, globs, or literal values.
+4. Resolve `${...}` bindings.
+5. Execute steps in dependency order.
+6. Render outputs and enforce output path safety.
+7. Return diagnostics, provenance, and trace events.
+
+Assisted steps are explicit boundaries. Without an injected generation hook:
+
+- optional assisted steps are skipped with a warning
+- required assisted steps fail
+
+This makes workflows useful without provider dependencies.
+
+## Supported Step Kinds
+
+| Kind | Result |
+| --- | --- |
+| `shape` | Structured data object. |
+| `extract` | `items`, `count`, and joined `text`. |
+| `query` | query `matches` and `count`. |
+| `template` | rendered `markdown`, variables, missing variables, completion flag. |
+| `compose` | composed `markdown` and sources. |
+| `transform` | transformed `markdown`, operations, provenance. |
+| `include` | include-resolved `markdown`, included paths, provenance. |
+| `contract_stub` | generated contract stub Markdown. |
+| `contract_check` | contract diagnostics and metrics. |
+| `assisted` | generated Markdown if a hook is supplied, otherwise skipped/diagnostic. |
+
+## Data Bindings
+
+Bindings use `${...}`:
+
+```yaml
+data:
+  decisions: ${sources.adrs.extracts.decisions}
+  summary: ${steps.render.markdown}
+```
+
+If the full string is one expression, the native type is preserved. If the
+expression appears inside a longer string, it is rendered as text.
+
+List projection is supported:
+
+```yaml
+paths: ${sources.adrs.items.path}
+```
+
+## Relationship To Extensions
+
+The workflow engine is registered as the built-in extension
+`workflow.markdown-dataflow`. It uses the canonical architecture for
+diagnostics, provenance, trace events, capabilities, and CLI affordance
+metadata, but workflow files remain business-facing orchestration artifacts.
diff --git a/docs/workflow-definition-standard.md b/docs/workflow-definition-standard.md
new file mode 100644
index 0000000..b80908e
--- /dev/null
+++ b/docs/workflow-definition-standard.md
@@ -0,0 +1,304 @@
+# Markitect Workflow Definition Standard
+
+## Purpose
+
+Markitect workflows describe repeatable Markdown-centered dataflow:
+
+```text
+Markdown inputs -> extracted data products -> deterministic/assisted steps
+                -> artifacts and Markdown outputs
+```
+
+The workflow standard is business-facing orchestration. It uses the internal
+extension framework for execution semantics, diagnostics, provenance,
+capabilities, and future policy gates, but it is not itself the extension
+framework.
+
+## File Format
+
+A workflow can be either:
+
+- a YAML file
+- a Markdown file with a fenced YAML block tagged `workflow`,
+  `markitect-workflow`, or `mkt-workflow`
+
+Example:
+
+````markdown
+# Release Notes Workflow
+
+```yaml workflow
+metadata:
+  id: release-notes
+  title: Release Notes
+intent:
+  summary: Build release notes from accepted ADR decisions.
+inputs:
+  adrs:
+    glob: docs/adr/*.md
+    extract:
+      decisions:
+        selector: sections[heading=Decision]
+outputs:
+  release_notes:
+    path: out/release-notes.md
+    content: ${steps.render.markdown}
+steps:
+  render:
+    kind: template
+    template: templates/release-notes.md
+    data:
+      decisions: ${sources.adrs.extracts.decisions}
+```
+````
+
+## Top-Level Sections
+
+| Section | Required | Purpose |
+| --- | --- | --- |
+| `metadata` | recommended | Stable id, title, owner, version, tags, timestamps. |
+| `intent` | recommended | Why the workflow exists and what success means. |
+| `inputs` | yes | Markdown files, directories, globs, literal values, or future index references. |
+| `steps` | yes for processing | Deterministic or assisted operations over bound data. |
+| `outputs` | optional | Files/artifacts produced from step or source data. |
+| `dependencies` | optional | Workflow-level dependencies on files, workplans, contracts, or other workflows. |
+| `conditions` | optional | Preconditions or skip rules. First version records these for inspection. |
+| `artifacts` | optional | Named non-output products such as manifests, traces, or reports. |
+| `permissions` | optional | Declared filesystem/network/provider/capability requirements. |
+| `resources` | optional | CPU, memory, token, model, or storage expectations. |
+| `timeouts` | optional | Workflow and step timeout budgets. First version records these. |
+| `retry_policies` | optional | Retry rules by step kind or id. First version records these. |
+| `escalation_rules` | optional | When human approval or operator attention is needed. |
+| `observability` | optional | Events, trace detail, metrics, and audit expectations. |
+| `responsibilities` | optional | Human/agent/system boundaries for review, approval, and execution. |
+
+Unknown top-level sections are preserved as `extensions` in the loaded model so
+the standard can evolve without immediately breaking older runners.
+
+## Metadata
+
+```yaml
+metadata:
+  id: release-notes
+  title: Release Notes
+  version: "1"
+  owner: documentation
+  tags: [adr, release]
+```
+
+`metadata.id` should be stable. It is used in diagnostics and provenance when
+available.
+
+## Intent
+
+```yaml
+intent:
+  summary: Build release notes from accepted decisions.
+  success_criteria:
+    - One output file is generated.
+    - Every accepted ADR contributes its decision section.
+```
+
+Intent is descriptive in the first implementation. Later policy and assessment
+layers may use it for review or LLM-assisted checks.
+
+## Inputs
+
+Inputs are named source collections or literal values.
+
+```yaml
+inputs:
+  adrs:
+    glob: docs/adr/*.md
+    recursive: false
+    where:
+      frontmatter.status: accepted
+    extract:
+      decisions:
+        selector: sections[heading=Decision]
+      status:
+        selector: frontmatter.status
+  static_context:
+    value:
+      product: Markitect
+```
+
+Supported source fields:
+
+- `file`: one Markdown file
+- `path`: alias for `file`
+- `files`: list of Markdown files
+- `glob`: glob pattern relative to the workflow directory
+- `directory`: directory of Markdown files
+- `recursive`: recurse when using `directory`
+- `selector`: selector to collect matches
+- `extract`: named selector map
+- `metrics`: include document metrics
+- `frontmatter`: include frontmatter
+- `value`: literal structured value, no file parsing
+
+Each Markdown input produces a collection:
+
+```yaml
+items:
+  - path: docs/adr/001.md
+    frontmatter: {...}
+    metrics: {...}
+    extracts:
+      decisions:
+        - "## Decision\n\n..."
+extracts:
+  decisions:
+    - "## Decision\n\n..."
+```
+
+## Steps
+
+Steps are named operations. `steps` may be either a mapping or a list with `id`.
+
+```yaml
+steps:
+  render:
+    kind: template
+    template: templates/release-notes.md
+    data:
+      decisions: ${sources.adrs.extracts.decisions}
+```
+
+Common fields:
+
+- `kind`: step kind
+- `depends_on`: other step ids
+- `when`: condition expression, reserved for future execution gating
+- `optional`: do not fail the whole workflow when this step is skipped or blocked
+- `permissions`: step-level permissions
+- `timeout`: step-level timeout declaration
+- `retry`: step-level retry policy reference or inline rule
+- `responsibility`: `human`, `agent`, `system`, or `mixed`
+
+First implementation step kinds:
+
+| Kind | Purpose |
+| --- | --- |
+| `shape` | Resolve data bindings into a structured object. |
+| `extract` | Extract text from a source collection or document. |
+| `query` | Return query match envelopes from a source collection or document. |
+| `template` | Render a deterministic Markdown template. |
+| `compose` | Join Markdown strings or files into one Markdown document. |
+| `transform` | Apply deterministic Markdown transforms. |
+| `include` | Resolve include markers in Markdown. |
+| `contract_stub` | Generate a Markdown stub from a contract. |
+| `contract_check` | Check a Markdown document against a contract. |
+| `assisted` | Provider-neutral assisted step boundary, optional by default. |
+
+## Data Bindings
+
+Workflow expressions use `${...}` references:
+
+```yaml
+data:
+  decisions: ${sources.adrs.extracts.decisions}
+  summary: ${steps.render.markdown}
+```
+
+If a string is exactly one expression, the resolved value keeps its native type.
+If an expression appears inside a longer string, it is rendered as text.
+
+Supported roots:
+
+- `metadata`
+- `intent`
+- `sources`
+- `steps`
+- `artifacts`
+- `workflow`
+
+Path behavior:
+
+- dictionary keys use dot notation
+- numeric list indexes are supported
+- applying a field to a list maps that field over every dictionary item
+
+## Outputs
+
+```yaml
+outputs:
+  release_notes:
+    path: out/release-notes.md
+    content: ${steps.render.markdown}
+```
+
+Supported output fields:
+
+- `path`: output path relative to `--output-dir` or workflow directory
+- `content`: Markdown/string/structured value to write
+- `template`: optional template path
+- `data`: data for template rendering
+- `artifact`: optional artifact name
+
+Output paths must stay within the output root.
+
+## Assisted Steps
+
+Assisted steps define the boundary; they do not require a provider dependency:
+
+```yaml
+review:
+  kind: assisted
+  optional: true
+  prompt: prompts/review.md
+  input: ${steps.render.markdown}
+  data:
+    rubric: concise release note review
+```
+
+When no assisted adapter is supplied:
+
+- optional assisted steps are skipped with a warning diagnostic
+- required assisted steps fail with an error diagnostic
+
+This keeps workflows runnable in deterministic environments.
+
+## Permissions And Responsibilities
+
+Permissions and responsibilities are declarative in the first runner and become
+policy inputs for later access-control work.
+
+```yaml
+permissions:
+  filesystem:
+    read: [docs, templates]
+    write: [out]
+  network: false
+  assisted_generation: false
+responsibilities:
+  human:
+    approves_outputs: true
+  agent:
+    may_run_deterministic_steps: true
+  system:
+    enforces_path_safety: true
+```
+
+## Observability
+
+```yaml
+observability:
+  events:
+    - workflow.started
+    - step.completed
+    - output.written
+  trace: summary
+```
+
+Workflow runs return trace events and diagnostics in JSON/YAML output. Future
+backends can persist these events.
+
+## Design Rules
+
+- Keep deterministic execution useful without providers.
+- Keep all outputs explainable through provenance and diagnostics.
+- Preserve unknown metadata rather than rejecting reasonable future extensions.
+- Make assisted, external, networked, or sensitive steps explicit.
+- Keep internal extension registration separate from business workflow
+  orchestration.
diff --git a/docs/workplan-planning-map.md b/docs/workplan-planning-map.md
index 8903fc0..8fd9de2 100644
--- a/docs/workplan-planning-map.md
+++ b/docs/workplan-planning-map.md
@@ -36,7 +36,7 @@ and descriptions mirror the operational view.
 | `MKTT-WP-0007` | complete | done | `MKTT-WP-0006` | Advanced query and local index backend is complete: AST inspection, optional JSONPath, SQLite snapshots/metadata, FTS5 search, incremental refresh, and local index CLI. |
 | `MKTT-WP-0013` | complete | done | `MKTT-WP-0003`, `MKTT-WP-0004`, `MKTT-WP-0006`, `MKTT-WP-0007`, `MKTT-WP-0010` | Internal extension framework is complete: characterization tests, canonical processing model, descriptors, registries, lifecycle callbacks, query-engine registry, built-in extension catalog, CLI command specs, and authoring guide. |
 | `MKTT-WP-0005` | P2 | todo | `MKTT-WP-0003`, `MKTT-WP-0004` | Pick up when generation/form/context or semantic assessment pressure appears. |
-| `MKTT-WP-0011` | P2 | todo | `MKTT-WP-0003`; task-level triggers: `MKTT-WP-0010-T001`, `MKTT-WP-0010-T005` | Declarative Markdown dataflow workflows: source extraction, deterministic/assisted processing, and multi-output generation. |
+| `MKTT-WP-0011` | complete | done | `MKTT-WP-0003`; task-level triggers: `MKTT-WP-0010-T001`, `MKTT-WP-0010-T005` | Markdown dataflow workflow layer is complete: workflow standard, source collectors, binding model, deterministic steps, assisted boundary, safe outputs, CLI, docs, and examples. |
 | `MKTT-WP-0009` | P2 | todo | `MKTT-WP-0006` | Establish access-control gateway before security-sensitive cache/context use. |
 | `MKTT-WP-0012` | P3 | todo | `MKTT-WP-0004`, `MKTT-WP-0010`, `MKTT-WP-0011` | Future Quarkdown-inspired document function layer: reusable Markdown-native function calls over processors, references, contracts, workflows, and later assisted steps. |
 | `MKTT-WP-0008` | P3 | todo | `MKTT-WP-0006`, `MKTT-WP-0007`, `MKTT-WP-0009` | Agent working-memory cache after backend and policy floor are available. |
diff --git a/examples/workflows/adr-release-notes.workflow.md b/examples/workflows/adr-release-notes.workflow.md
new file mode 100644
index 0000000..ab44b2f
--- /dev/null
+++ b/examples/workflows/adr-release-notes.workflow.md
@@ -0,0 +1,55 @@
+# ADR Release Notes Workflow
+
+```yaml workflow
+metadata:
+  id: adr-release-notes
+  title: ADR Release Notes
+  version: "1"
+  owner: documentation
+intent:
+  summary: Build release notes from accepted ADR decisions.
+inputs:
+  adrs:
+    glob: adrs/*.md
+    where:
+      frontmatter.status: accepted
+    extract:
+      decisions:
+        selector: sections[heading=Decision]
+      statuses:
+        selector: frontmatter.status
+steps:
+  render:
+    kind: template
+    template: templates/release-notes.md
+    data:
+      title: ADR Release Notes
+      decisions: ${sources.adrs.extracts.decisions}
+outputs:
+  release_notes:
+    path: out/release-notes.md
+    content: ${steps.render.markdown}
+permissions:
+  filesystem:
+    read: [adrs, templates]
+    write: [out]
+  network: false
+resources:
+  cpu: local
+timeouts:
+  workflow: 30s
+retry_policies:
+  default:
+    max_attempts: 1
+escalation_rules:
+  output_review:
+    when: before_publish
+    responsible: human
+observability:
+  events: [workflow.started, workflow.step.completed, workflow.output.ready]
+responsibilities:
+  agent:
+    may_run_deterministic_steps: true
+  human:
+    approves_publication: true
+```
diff --git a/examples/workflows/adrs/001-record-contract-framework.md b/examples/workflows/adrs/001-record-contract-framework.md
new file mode 100644
index 0000000..2386c3d
--- /dev/null
+++ b/examples/workflows/adrs/001-record-contract-framework.md
@@ -0,0 +1,14 @@
+---
+status: accepted
+---
+
+# Record Contract Framework
+
+## Context
+
+Document generation needs clear semantic contracts.
+
+## Decision
+
+Use Markdown-native contracts with deterministic assertions before optional
+assisted assessments.
diff --git a/examples/workflows/adrs/002-record-cache-backend.md b/examples/workflows/adrs/002-record-cache-backend.md
new file mode 100644
index 0000000..5ee24fa
--- /dev/null
+++ b/examples/workflows/adrs/002-record-cache-backend.md
@@ -0,0 +1,13 @@
+---
+status: accepted
+---
+
+# Record Cache Backend
+
+## Context
+
+Repeated query and context workflows benefit from cached parsed structure.
+
+## Decision
+
+Use an optional local SQLite backend for snapshots, metadata, JSON, and FTS.
diff --git a/examples/workflows/assisted-review.workflow.md b/examples/workflows/assisted-review.workflow.md
new file mode 100644
index 0000000..6cca2fc
--- /dev/null
+++ b/examples/workflows/assisted-review.workflow.md
@@ -0,0 +1,24 @@
+# Assisted Review Workflow
+
+```yaml workflow
+metadata:
+  id: assisted-review-boundary
+intent:
+  summary: Show an optional assisted-generation boundary.
+steps:
+  review:
+    kind: assisted
+    optional: true
+    prompt_text: Review the generated Markdown for clarity.
+    data:
+      rubric: concise
+outputs:
+  review:
+    path: out/review.md
+    content: ${steps.review.skipped}
+permissions:
+  assisted_generation: false
+responsibilities:
+  human:
+    approves_assisted_use: true
+```
diff --git a/examples/workflows/snippets/source.md b/examples/workflows/snippets/source.md
new file mode 100644
index 0000000..5c80d61
--- /dev/null
+++ b/examples/workflows/snippets/source.md
@@ -0,0 +1,6 @@
+# Source
+
+```python
+def example():
+    return "markitect"
+```
diff --git a/examples/workflows/source-snippets.workflow.md b/examples/workflows/source-snippets.workflow.md
new file mode 100644
index 0000000..cc1163d
--- /dev/null
+++ b/examples/workflows/source-snippets.workflow.md
@@ -0,0 +1,32 @@
+# Source Snippets Workflow
+
+```yaml workflow
+metadata:
+  id: source-snippets
+  title: Source Snippets
+intent:
+  summary: Extract code fences from Markdown documents into a generated note.
+inputs:
+  docs:
+    file: snippets/source.md
+    extract:
+      code:
+        selector: blocks[type=code]
+steps:
+  render:
+    kind: template
+    template: templates/snippets.md
+    data:
+      snippets: ${sources.docs.extracts.code}
+outputs:
+  snippets:
+    path: out/snippets.md
+    content: ${steps.render.markdown}
+permissions:
+  filesystem:
+    read: [snippets, templates]
+    write: [out]
+responsibilities:
+  agent:
+    may_run_deterministic_steps: true
+```
diff --git a/examples/workflows/templates/release-notes.md b/examples/workflows/templates/release-notes.md
new file mode 100644
index 0000000..9ea69d2
--- /dev/null
+++ b/examples/workflows/templates/release-notes.md
@@ -0,0 +1,3 @@
+# {{title}}
+
+{{decisions}}
diff --git a/examples/workflows/templates/snippets.md b/examples/workflows/templates/snippets.md
new file mode 100644
index 0000000..8b954d8
--- /dev/null
+++ b/examples/workflows/templates/snippets.md
@@ -0,0 +1,3 @@
+# Extracted Snippets
+
+{{snippets}}
diff --git a/src/markitect_tool/__init__.py b/src/markitect_tool/__init__.py
index 04c23cb..2e72e46 100644
--- a/src/markitect_tool/__init__.py
+++ b/src/markitect_tool/__init__.py
@@ -156,6 +156,15 @@ from markitect_tool.template import (
     analyze_template,
     render_template,
 )
+from markitect_tool.workflow import (
+    WorkflowError,
+    WorkflowOutputRecord,
+    WorkflowPlan,
+    WorkflowRunResult,
+    WorkflowRunner,
+    load_workflow_file,
+    resolve_workflow_bindings,
+)
 
 __all__ = [
     "ContentBlock",
@@ -287,4 +296,11 @@ __all__ = [
     "TemplateRenderResult",
     "analyze_template",
     "render_template",
+    "WorkflowError",
+    "WorkflowOutputRecord",
+    "WorkflowPlan",
+    "WorkflowRunResult",
+    "WorkflowRunner",
+    "load_workflow_file",
+    "resolve_workflow_bindings",
 ]
diff --git a/src/markitect_tool/cli/main.py b/src/markitect_tool/cli/main.py
index 2277b87..9894c70 100644
--- a/src/markitect_tool/cli/main.py
+++ b/src/markitect_tool/cli/main.py
@@ -72,6 +72,7 @@ from markitect_tool.template import (
     analyze_template,
     render_template,
 )
+from markitect_tool.workflow import WorkflowError, WorkflowRunner, load_workflow_file
 
 
 @click.group()
@@ -1124,6 +1125,90 @@ def search(
     _emit_search_results(data, output_format)
 
 
+@main.group()
+def workflow() -> None:
+    """Inspect, plan, and run declarative Markdown workflows."""
+
+
+@workflow.command("inspect")
+@click.argument("workflow_file", type=click.Path(exists=True, dir_okay=False, path_type=Path))
+@click.option(
+    "--format",
+    "output_format",
+    type=click.Choice(["json", "yaml", "text"], case_sensitive=False),
+    default="text",
+    show_default=True,
+)
+def workflow_inspect(workflow_file: Path, output_format: str) -> None:
+    """Inspect a workflow definition without executing steps."""
+
+    try:
+        plan = load_workflow_file(workflow_file)
+        result = WorkflowRunner(plan).inspect()
+    except WorkflowError as exc:
+        raise click.ClickException(str(exc)) from exc
+    _emit_workflow_result(result.to_dict() | {"workflow": plan.to_dict()}, output_format)
+    raise click.exceptions.Exit(0 if result.valid else 1)
+
+
+@workflow.command("plan")
+@click.argument("workflow_file", type=click.Path(exists=True, dir_okay=False, path_type=Path))
+@click.option(
+    "--output-dir",
+    type=click.Path(file_okay=False, path_type=Path),
+    help="Output root for path-safety checks. No files are written in plan mode.",
+)
+@click.option(
+    "--format",
+    "output_format",
+    type=click.Choice(["json", "yaml", "text"], case_sensitive=False),
+    default="text",
+    show_default=True,
+)
+def workflow_plan(workflow_file: Path, output_dir: Path | None, output_format: str) -> None:
+    """Run a workflow in dry-run mode and report planned outputs."""
+
+    try:
+        plan = load_workflow_file(workflow_file)
+        result = WorkflowRunner(plan, output_dir=output_dir).run(dry_run=True)
+    except WorkflowError as exc:
+        raise click.ClickException(str(exc)) from exc
+    _emit_workflow_result(result.to_dict(), output_format)
+    raise click.exceptions.Exit(0 if result.valid else 1)
+
+
+@workflow.command("run")
+@click.argument("workflow_file", type=click.Path(exists=True, dir_okay=False, path_type=Path))
+@click.option(
+    "--output-dir",
+    type=click.Path(file_okay=False, path_type=Path),
+    help="Output root for workflow outputs. Defaults to the workflow directory.",
+)
+@click.option("--dry-run", is_flag=True, help="Execute without writing output files.")
+@click.option(
+    "--format",
+    "output_format",
+    type=click.Choice(["json", "yaml", "text"], case_sensitive=False),
+    default="text",
+    show_default=True,
+)
+def workflow_run(
+    workflow_file: Path,
+    output_dir: Path | None,
+    dry_run: bool,
+    output_format: str,
+) -> None:
+    """Run a deterministic Markdown workflow."""
+
+    try:
+        plan = load_workflow_file(workflow_file)
+        result = WorkflowRunner(plan, output_dir=output_dir).run(dry_run=dry_run)
+    except WorkflowError as exc:
+        raise click.ClickException(str(exc)) from exc
+    _emit_workflow_result(result.to_dict(), output_format)
+    raise click.exceptions.Exit(0 if result.valid else 1)
+
+
 @main.group()
 def template() -> None:
     """Render and inspect deterministic Markdown templates."""
@@ -1560,6 +1645,32 @@ def _emit_search_results(data: dict, output_format: str) -> None:
                 click.echo(f"  {preview[:160]}")
 
 
+def _emit_workflow_result(data: dict, output_format: str) -> None:
+    if output_format == "json":
+        click.echo(json.dumps(data, indent=2, ensure_ascii=False))
+    elif output_format == "yaml":
+        click.echo(yaml.safe_dump(data, sort_keys=False))
+    else:
+        click.echo("valid" if data.get("valid", True) else "invalid")
+        click.echo(f"workflow: {data.get('workflow_id') or data.get('workflow', {}).get('id', '<unknown>')}")
+        if data.get("sources"):
+            click.echo(f"sources: {len(data['sources'])}")
+            for source_id, source_data in data["sources"].items():
+                click.echo(f"- {source_id}: {source_data.get('count', 1)}")
+        if data.get("steps"):
+            click.echo(f"steps: {len(data['steps'])}")
+            for step_id, step_data in data["steps"].items():
+                click.echo(f"- {step_id}: {step_data.get('kind', '<unknown>')}")
+        if data.get("outputs"):
+            click.echo(f"outputs: {len(data['outputs'])}")
+            for output in data["outputs"]:
+                status = "written" if output.get("written") else "planned"
+                path = output.get("path") or "<memory>"
+                click.echo(f"- {output['id']}: {status} {path}")
+        for diagnostic in data.get("diagnostics", []):
+            click.echo(f"! [{diagnostic['severity']}] {diagnostic['code']}: {diagnostic['message']}")
+
+
 def _emit_reference_result(data: dict, output_format: str) -> None:
     if output_format == "json":
         click.echo(json.dumps(data, indent=2, ensure_ascii=False))
diff --git a/src/markitect_tool/extension/builtins.py b/src/markitect_tool/extension/builtins.py
index 5037f02..f021b46 100644
--- a/src/markitect_tool/extension/builtins.py
+++ b/src/markitect_tool/extension/builtins.py
@@ -11,7 +11,10 @@ def builtin_extension_registry() -> ExtensionRegistry:
     """Return descriptors for built-in Markitect extensions."""
 
     registry = default_query_engine_registry().extension_registry()
-    for descriptor in _processor_descriptors() + [_local_sqlite_backend_descriptor()]:
+    for descriptor in _processor_descriptors() + [
+        _local_sqlite_backend_descriptor(),
+        _workflow_engine_descriptor(),
+    ]:
         registry.register(descriptor)
     return registry
 
@@ -90,3 +93,30 @@ def _local_sqlite_backend_descriptor() -> ExtensionDescriptor:
         docs=["docs/local-index-backend.md", "docs/backend-fabric.md"],
         examples=["examples/backends/local-sqlite-backend.md"],
     )
+
+
+def _workflow_engine_descriptor() -> ExtensionDescriptor:
+    return ExtensionDescriptor(
+        id="workflow.markdown-dataflow",
+        kind="workflow-engine",
+        summary="Declarative Markdown dataflow workflow engine.",
+        capabilities=[
+            ProcessingCapability(id="workflow", kind="execute"),
+            ProcessingCapability(id="markdown", kind="read"),
+            ProcessingCapability(id="templates", kind="execute"),
+            ProcessingCapability(id="provenance", kind="emit"),
+        ],
+        safety={
+            "reads_files": True,
+            "writes_output_files": True,
+            "network": False,
+            "assisted_generation": "adapter-only",
+        },
+        input_contract="Markdown/YAML workflow definition",
+        output_contract="WorkflowRunResult",
+        diagnostics_namespace="workflow",
+        provenance_prefix="workflow",
+        cli={"commands": ["mkt workflow inspect", "mkt workflow plan", "mkt workflow run"]},
+        docs=["docs/workflow-definition-standard.md"],
+        examples=["examples/workflows/adr-release-notes.workflow.md"],
+    )
diff --git a/src/markitect_tool/workflow/__init__.py b/src/markitect_tool/workflow/__init__.py
new file mode 100644
index 0000000..c10e224
--- /dev/null
+++ b/src/markitect_tool/workflow/__init__.py
@@ -0,0 +1,21 @@
+"""Declarative Markdown dataflow workflows."""
+
+from markitect_tool.workflow.engine import (
+    WorkflowError,
+    WorkflowOutputRecord,
+    WorkflowPlan,
+    WorkflowRunResult,
+    WorkflowRunner,
+    load_workflow_file,
+    resolve_workflow_bindings,
+)
+
+__all__ = [
+    "WorkflowError",
+    "WorkflowOutputRecord",
+    "WorkflowPlan",
+    "WorkflowRunResult",
+    "WorkflowRunner",
+    "load_workflow_file",
+    "resolve_workflow_bindings",
+]
diff --git a/src/markitect_tool/workflow/engine.py b/src/markitect_tool/workflow/engine.py
new file mode 100644
index 0000000..2f0a5a7
--- /dev/null
+++ b/src/markitect_tool/workflow/engine.py
@@ -0,0 +1,827 @@
+"""Workflow definition loading and deterministic execution."""
+
+from __future__ import annotations
+
+import glob
+import re
+from dataclasses import asdict, dataclass, field
+from pathlib import Path
+from typing import Any
+
+import yaml
+
+from markitect_tool.cache import scan_markdown_files
+from markitect_tool.contract import check_markdown_file, collect_metrics, load_contract_file
+from markitect_tool.core import Document, parse_markdown_file
+from markitect_tool.diagnostics import Diagnostic, SourceLocation, has_error
+from markitect_tool.extension import ProcessingProvenance, ProcessingTrace
+from markitect_tool.generation import (
+    GenerationHook,
+    GenerationHookRequest,
+    generate_stub_from_contract,
+)
+from markitect_tool.ops import compose_files, resolve_includes, transform_markdown
+from markitect_tool.query import (
+    extract_document_with_engine,
+    query_document_with_engine,
+)
+from markitect_tool.template import MissingTemplateVariable, TemplateError, render_template
+
+
+WORKFLOW_FENCE_TAGS = {"workflow", "markitect-workflow", "mkt-workflow"}
+KNOWN_TOP_LEVEL = {
+    "metadata",
+    "intent",
+    "inputs",
+    "outputs",
+    "steps",
+    "dependencies",
+    "conditions",
+    "artifacts",
+    "permissions",
+    "resources",
+    "timeouts",
+    "retry_policies",
+    "escalation_rules",
+    "observability",
+    "responsibilities",
+}
+_EXPRESSION_RE = re.compile(r"\$\{(?P<path>[^}]+)\}")
+
+
+class WorkflowError(ValueError):
+    """Raised when a workflow definition cannot be loaded or executed."""
+
+
+@dataclass(frozen=True)
+class WorkflowPlan:
+    """Loaded declarative workflow definition."""
+
+    metadata: dict[str, Any] = field(default_factory=dict)
+    intent: dict[str, Any] = field(default_factory=dict)
+    inputs: dict[str, dict[str, Any]] = field(default_factory=dict)
+    steps: list[dict[str, Any]] = field(default_factory=list)
+    outputs: dict[str, dict[str, Any]] = field(default_factory=dict)
+    dependencies: list[Any] = field(default_factory=list)
+    conditions: dict[str, Any] = field(default_factory=dict)
+    artifacts: dict[str, Any] = field(default_factory=dict)
+    permissions: dict[str, Any] = field(default_factory=dict)
+    resources: dict[str, Any] = field(default_factory=dict)
+    timeouts: dict[str, Any] = field(default_factory=dict)
+    retry_policies: dict[str, Any] = field(default_factory=dict)
+    escalation_rules: dict[str, Any] = field(default_factory=dict)
+    observability: dict[str, Any] = field(default_factory=dict)
+    responsibilities: dict[str, Any] = field(default_factory=dict)
+    extensions: dict[str, Any] = field(default_factory=dict)
+    source_path: str | None = None
+
+    @property
+    def id(self) -> str:
+        return str(self.metadata.get("id") or self.metadata.get("name") or "workflow")
+
+    def to_dict(self) -> dict[str, Any]:
+        data = asdict(self)
+        return {key: value for key, value in data.items() if value not in (None, [], {})}
+
+
+@dataclass(frozen=True)
+class WorkflowOutputRecord:
+    """One output considered or written by a workflow run."""
+
+    id: str
+    path: str | None
+    content: str
+    written: bool = False
+    artifact: str | None = None
+
+    def to_dict(self) -> dict[str, Any]:
+        return {key: value for key, value in asdict(self).items() if value not in (None, "")}
+
+
+@dataclass(frozen=True)
+class WorkflowRunResult:
+    """Result envelope for workflow inspect/plan/run operations."""
+
+    workflow_id: str
+    plan_path: str | None
+    dry_run: bool
+    sources: dict[str, Any] = field(default_factory=dict)
+    steps: dict[str, Any] = field(default_factory=dict)
+    outputs: list[WorkflowOutputRecord] = field(default_factory=list)
+    diagnostics: list[Diagnostic] = field(default_factory=list)
+    provenance: list[ProcessingProvenance] = field(default_factory=list)
+    trace: list[ProcessingTrace] = field(default_factory=list)
+
+    @property
+    def valid(self) -> bool:
+        return not has_error(self.diagnostics)
+
+    def to_dict(self) -> dict[str, Any]:
+        data = {
+            "workflow_id": self.workflow_id,
+            "plan_path": self.plan_path,
+            "dry_run": self.dry_run,
+            "valid": self.valid,
+            "sources": self.sources,
+            "steps": self.steps,
+            "outputs": [output.to_dict() for output in self.outputs],
+            "diagnostics": [diagnostic.to_dict() for diagnostic in self.diagnostics],
+            "provenance": [event.to_dict() for event in self.provenance],
+            "trace": [event.to_dict() for event in self.trace],
+        }
+        return {key: value for key, value in data.items() if value not in (None, [], {})}
+
+
+class WorkflowRunner:
+    """Execute deterministic Markitect workflows."""
+
+    def __init__(
+        self,
+        plan: WorkflowPlan,
+        *,
+        base_dir: str | Path | None = None,
+        output_dir: str | Path | None = None,
+        assisted_hook: GenerationHook | None = None,
+    ) -> None:
+        self.plan = plan
+        self.base_dir = Path(base_dir or Path(plan.source_path or ".").parent).resolve()
+        self.output_dir = Path(output_dir).resolve() if output_dir else self.base_dir
+        self.assisted_hook = assisted_hook
+
+    def inspect(self) -> WorkflowRunResult:
+        diagnostics = validate_workflow_plan(self.plan)
+        return WorkflowRunResult(
+            workflow_id=self.plan.id,
+            plan_path=self.plan.source_path,
+            dry_run=True,
+            diagnostics=diagnostics,
+            trace=[ProcessingTrace(event="workflow.inspected", metadata={"id": self.plan.id})],
+        )
+
+    def run(self, *, dry_run: bool = False) -> WorkflowRunResult:
+        diagnostics = validate_workflow_plan(self.plan)
+        trace = [ProcessingTrace(event="workflow.started", metadata={"id": self.plan.id})]
+        provenance: list[ProcessingProvenance] = []
+        sources: dict[str, Any] = {}
+        steps: dict[str, Any] = {}
+        outputs: list[WorkflowOutputRecord] = []
+
+        if has_error(diagnostics):
+            return WorkflowRunResult(
+                workflow_id=self.plan.id,
+                plan_path=self.plan.source_path,
+                dry_run=dry_run,
+                diagnostics=diagnostics,
+                trace=trace,
+            )
+
+        context = _base_context(self.plan, sources, steps)
+        for input_id, spec in self.plan.inputs.items():
+            try:
+                sources[input_id] = self._collect_input(input_id, spec)
+                trace.append(ProcessingTrace(event="workflow.input.collected", metadata={"id": input_id}))
+            except Exception as exc:
+                diagnostics.append(_diagnostic("workflow.input_failed", str(exc), details={"input": input_id}))
+        if has_error(diagnostics):
+            return WorkflowRunResult(self.plan.id, self.plan.source_path, dry_run, sources, steps, outputs, diagnostics, provenance, trace)
+
+        context = _base_context(self.plan, sources, steps)
+        for step in _ordered_steps(self.plan.steps, diagnostics):
+            step_id = str(step["id"])
+            try:
+                resolved_step = resolve_workflow_bindings(step, context)
+                step_result = self._run_step(resolved_step)
+                steps[step_id] = step_result
+                context = _base_context(self.plan, sources, steps)
+                trace.append(ProcessingTrace(event="workflow.step.completed", metadata={"id": step_id, "kind": step.get("kind")}))
+                provenance.append(
+                    ProcessingProvenance(
+                        operation=f"workflow.step.{step.get('kind', 'unknown')}",
+                        source_path=self.plan.source_path,
+                        metadata={"step_id": step_id},
+                    )
+                )
+            except Exception as exc:
+                optional = bool(step.get("optional", False))
+                diagnostics.append(
+                    _diagnostic(
+                        "workflow.step_failed",
+                        str(exc),
+                        severity="warning" if optional else "error",
+                        details={"step": step_id, "kind": step.get("kind"), "optional": optional},
+                    )
+                )
+                if not optional:
+                    break
+        if has_error(diagnostics):
+            return WorkflowRunResult(self.plan.id, self.plan.source_path, dry_run, sources, steps, outputs, diagnostics, provenance, trace)
+
+        context = _base_context(self.plan, sources, steps)
+        for output_id, spec in self.plan.outputs.items():
+            try:
+                output = self._render_output(output_id, spec, context, dry_run=dry_run)
+                outputs.append(output)
+                trace.append(ProcessingTrace(event="workflow.output.ready", metadata={"id": output_id, "written": output.written}))
+                provenance.append(
+                    ProcessingProvenance(
+                        operation="workflow.output",
+                        source_path=self.plan.source_path,
+                        dependencies=[output.path] if output.path else [],
+                        metadata={"output_id": output_id, "written": output.written},
+                    )
+                )
+            except Exception as exc:
+                diagnostics.append(_diagnostic("workflow.output_failed", str(exc), details={"output": output_id}))
+
+        trace.append(ProcessingTrace(event="workflow.completed", metadata={"id": self.plan.id, "valid": not has_error(diagnostics)}))
+        return WorkflowRunResult(
+            workflow_id=self.plan.id,
+            plan_path=self.plan.source_path,
+            dry_run=dry_run,
+            sources=sources,
+            steps=steps,
+            outputs=outputs,
+            diagnostics=diagnostics,
+            provenance=provenance,
+            trace=trace,
+        )
+
+    def _collect_input(self, input_id: str, spec: dict[str, Any]) -> Any:
+        if "value" in spec:
+            return {"id": input_id, "kind": "value", "value": spec["value"]}
+
+        paths = _input_paths(spec, self.base_dir)
+        selector = spec.get("selector")
+        extract_specs = _extract_specs(spec.get("extract"))
+        include_metrics = bool(spec.get("metrics", True))
+        include_frontmatter = bool(spec.get("frontmatter", True))
+        where = dict(spec.get("where") or {})
+        items: list[dict[str, Any]] = []
+        aggregate_extracts: dict[str, list[Any]] = {name: [] for name in extract_specs}
+        aggregate_matches: list[dict[str, Any]] = []
+
+        for path in paths:
+            document = parse_markdown_file(path)
+            if where and not _matches_where(document.to_dict(), where):
+                continue
+            item: dict[str, Any] = {
+                "path": _relative(path, self.base_dir),
+                "markdown": path.read_text(encoding="utf-8"),
+                "document": document.to_dict(),
+            }
+            if include_frontmatter:
+                item["frontmatter"] = document.frontmatter
+            if include_metrics:
+                item["metrics"] = collect_metrics(document).to_dict()
+            if selector:
+                matches = [match.to_dict() for match in query_document_with_engine(document, str(selector), engine=str(spec.get("engine", "selector")))]
+                item["matches"] = matches
+                aggregate_matches.extend(matches)
+            if extract_specs:
+                item_extracts: dict[str, list[str]] = {}
+                for name, extract_spec in extract_specs.items():
+                    selected = extract_document_with_engine(
+                        document,
+                        str(extract_spec["selector"]),
+                        engine=str(extract_spec.get("engine", spec.get("engine", "selector"))),
+                    )
+                    item_extracts[name] = selected
+                    aggregate_extracts[name].extend(selected)
+                item["extracts"] = item_extracts
+            items.append(item)
+
+        return {
+            "id": input_id,
+            "kind": "markdown_collection",
+            "count": len(items),
+            "items": items,
+            "paths": [item["path"] for item in items],
+            "extracts": aggregate_extracts,
+            "matches": aggregate_matches,
+        }
+
+    def _run_step(self, step: dict[str, Any]) -> dict[str, Any]:
+        kind = str(step.get("kind", "")).strip()
+        if not kind:
+            raise WorkflowError("Workflow step requires `kind`")
+        if kind == "shape":
+            return {"kind": kind, "data": step.get("data", step.get("value", {}))}
+        if kind == "extract":
+            return self._step_extract(step)
+        if kind == "query":
+            return self._step_query(step)
+        if kind == "template":
+            return self._step_template(step)
+        if kind == "compose":
+            return self._step_compose(step)
+        if kind == "transform":
+            return self._step_transform(step)
+        if kind == "include":
+            return self._step_include(step)
+        if kind == "contract_stub":
+            return self._step_contract_stub(step)
+        if kind == "contract_check":
+            return self._step_contract_check(step)
+        if kind == "assisted":
+            return self._step_assisted(step)
+        raise WorkflowError(f"Unsupported workflow step kind `{kind}`")
+
+    def _step_extract(self, step: dict[str, Any]) -> dict[str, Any]:
+        selector = str(step.get("selector", ""))
+        if not selector:
+            raise WorkflowError("extract step requires `selector`")
+        values = _query_like_step(step, selector, query=False)
+        return {"kind": "extract", "items": values, "count": len(values), "text": "\n\n".join(values)}
+
+    def _step_query(self, step: dict[str, Any]) -> dict[str, Any]:
+        selector = str(step.get("selector", ""))
+        if not selector:
+            raise WorkflowError("query step requires `selector`")
+        matches = _query_like_step(step, selector, query=True)
+        return {"kind": "query", "matches": matches, "count": len(matches)}
+
+    def _step_template(self, step: dict[str, Any]) -> dict[str, Any]:
+        template_text = _template_text(step, self.base_dir)
+        try:
+            rendered = render_template(template_text, dict(step.get("data") or {}), strict=bool(step.get("strict", True)))
+        except MissingTemplateVariable as exc:
+            raise WorkflowError(str(exc)) from exc
+        except TemplateError as exc:
+            raise WorkflowError(str(exc)) from exc
+        return rendered.to_dict() | {"kind": "template"}
+
+    def _step_compose(self, step: dict[str, Any]) -> dict[str, Any]:
+        if step.get("files"):
+            result = compose_files(
+                [_safe_input_path(self.base_dir, value) for value in step["files"]],
+                title=step.get("title"),
+                heading_delta=int(step.get("heading_delta", 0)),
+                include_frontmatter=bool(step.get("include_frontmatter", False)),
+                separator=str(step.get("separator", "\n\n---\n\n")),
+            )
+            return result.to_dict() | {"kind": "compose"}
+        items = step.get("items", step.get("input", []))
+        if not isinstance(items, list):
+            items = [items]
+        separator = str(step.get("separator", "\n\n---\n\n"))
+        parts = [str(item).strip() for item in items if item is not None and str(item).strip()]
+        title = step.get("title")
+        if title:
+            parts.insert(0, f"# {str(title).strip()}")
+        return {"kind": "compose", "markdown": separator.join(parts).strip() + "\n", "sources": []}
+
+    def _step_transform(self, step: dict[str, Any]) -> dict[str, Any]:
+        markdown = _markdown_input(step, self.base_dir)
+        result = transform_markdown(
+            markdown,
+            strip_frontmatter=bool(step.get("strip_frontmatter", False)),
+            set_frontmatter=dict(step.get("set_frontmatter") or {}),
+            heading_delta=int(step.get("heading_delta", 0)),
+            extract_selector=step.get("extract_selector"),
+            source_path=step.get("source_path"),
+        )
+        return result.to_dict() | {"kind": "transform"}
+
+    def _step_include(self, step: dict[str, Any]) -> dict[str, Any]:
+        markdown = _markdown_input(step, self.base_dir)
+        result = resolve_includes(
+            markdown,
+            base_dir=_safe_dir(self.base_dir, step.get("base_dir", ".")),
+            current_path=step.get("current_path"),
+            max_depth=int(step.get("max_depth", 10)),
+        )
+        return result.to_dict() | {"kind": "include"}
+
+    def _step_contract_stub(self, step: dict[str, Any]) -> dict[str, Any]:
+        contract = load_contract_file(_safe_input_path(self.base_dir, step.get("contract")))
+        generated = generate_stub_from_contract(
+            contract,
+            data=dict(step.get("data") or {}),
+            include_optional=bool(step.get("include_optional", False)),
+        )
+        return generated.to_dict() | {"kind": "contract_stub"}
+
+    def _step_contract_check(self, step: dict[str, Any]) -> dict[str, Any]:
+        document_path = _safe_input_path(self.base_dir, step.get("document"))
+        contract_path = _safe_input_path(self.base_dir, step.get("contract"))
+        result = check_markdown_file(document_path, contract_path)
+        return result.to_dict() | {"kind": "contract_check"}
+
+    def _step_assisted(self, step: dict[str, Any]) -> dict[str, Any]:
+        optional = bool(step.get("optional", True))
+        if self.assisted_hook is None:
+            diagnostic = _diagnostic(
+                "workflow.assisted_unavailable",
+                "Assisted workflow step has no generation hook adapter.",
+                severity="warning" if optional else "error",
+                details={"step": step.get("id"), "optional": optional},
+            )
+            if optional:
+                return {"kind": "assisted", "skipped": True, "diagnostics": [diagnostic.to_dict()]}
+            raise WorkflowError(diagnostic.message)
+        prompt = str(step.get("prompt_text") or "")
+        if step.get("prompt"):
+            prompt = _safe_input_path(self.base_dir, step["prompt"]).read_text(encoding="utf-8")
+        request = GenerationHookRequest(
+            prompt=prompt,
+            data=dict(step.get("data") or {}),
+            template=step.get("template"),
+            contract_id=step.get("contract_id"),
+            metadata={"workflow_id": self.plan.id, "step_id": step.get("id")},
+        )
+        generated = self.assisted_hook.generate(request)
+        return generated.to_dict() | {"kind": "assisted"}
+
+    def _render_output(
+        self,
+        output_id: str,
+        spec: dict[str, Any],
+        context: dict[str, Any],
+        *,
+        dry_run: bool,
+    ) -> WorkflowOutputRecord:
+        resolved = resolve_workflow_bindings(spec, context)
+        if "template" in resolved:
+            template_text = _safe_input_path(self.base_dir, resolved["template"]).read_text(encoding="utf-8")
+            content = render_template(template_text, dict(resolved.get("data") or {}), strict=bool(resolved.get("strict", True))).markdown
+        else:
+            content = _format_output_value(resolved.get("content", resolved.get("value", "")))
+        output_path: Path | None = None
+        written = False
+        if resolved.get("path"):
+            output_path = _safe_output_path(self.output_dir, resolved["path"])
+            if not dry_run:
+                output_path.parent.mkdir(parents=True, exist_ok=True)
+                output_path.write_text(content, encoding="utf-8")
+                written = True
+        return WorkflowOutputRecord(
+            id=output_id,
+            path=str(output_path) if output_path else None,
+            content=content,
+            written=written,
+            artifact=resolved.get("artifact"),
+        )
+
+
+def load_workflow_file(path: str | Path) -> WorkflowPlan:
+    """Load a YAML or Markdown-fenced workflow definition."""
+
+    file_path = Path(path)
+    text = file_path.read_text(encoding="utf-8")
+    data = _load_workflow_mapping(text, file_path)
+    return _workflow_from_mapping(data, source_path=str(file_path))
+
+
+def validate_workflow_plan(plan: WorkflowPlan) -> list[Diagnostic]:
+    diagnostics: list[Diagnostic] = []
+    if not plan.inputs and not plan.steps:
+        diagnostics.append(_diagnostic("workflow.empty", "Workflow requires at least inputs or steps."))
+    seen_steps: set[str] = set()
+    for step in plan.steps:
+        step_id = str(step.get("id", "")).strip()
+        if not step_id:
+            diagnostics.append(_diagnostic("workflow.step_missing_id", "Workflow step requires `id`."))
+            continue
+        if step_id in seen_steps:
+            diagnostics.append(_diagnostic("workflow.step_duplicate_id", f"Duplicate workflow step id `{step_id}`."))
+        seen_steps.add(step_id)
+        if not step.get("kind"):
+            diagnostics.append(_diagnostic("workflow.step_missing_kind", f"Workflow step `{step_id}` requires `kind`."))
+    return diagnostics
+
+
+def resolve_workflow_bindings(value: Any, context: dict[str, Any]) -> Any:
+    """Resolve `${...}` expressions recursively."""
+
+    if isinstance(value, dict):
+        return {key: resolve_workflow_bindings(item, context) for key, item in value.items()}
+    if isinstance(value, list):
+        return [resolve_workflow_bindings(item, context) for item in value]
+    if not isinstance(value, str):
+        return value
+    matches = list(_EXPRESSION_RE.finditer(value))
+    if not matches:
+        return value
+    if len(matches) == 1 and matches[0].span() == (0, len(value)):
+        return _resolve_path(context, matches[0].group("path").strip())
+
+    def replace(match: re.Match[str]) -> str:
+        return _format_output_value(_resolve_path(context, match.group("path").strip()))
+
+    return _EXPRESSION_RE.sub(replace, value)
+
+
+def _load_workflow_mapping(text: str, path: Path) -> dict[str, Any]:
+    if path.suffix.lower() in {".yaml", ".yml"}:
+        data = yaml.safe_load(text) or {}
+    else:
+        data = _extract_markdown_workflow_block(text)
+    if not isinstance(data, dict):
+        raise WorkflowError("Workflow definition must be a mapping")
+    return data
+
+
+def _extract_markdown_workflow_block(text: str) -> dict[str, Any]:
+    fence_re = re.compile(r"```(?P<info>[^\n`]*)\n(?P<body>.*?)\n```", re.DOTALL)
+    for match in fence_re.finditer(text):
+        info = set(match.group("info").strip().lower().split())
+        if info & WORKFLOW_FENCE_TAGS:
+            data = yaml.safe_load(match.group("body")) or {}
+            if not isinstance(data, dict):
+                raise WorkflowError("Workflow fenced block must contain a YAML mapping")
+            return data
+    raise WorkflowError("No fenced workflow YAML block found")
+
+
+def _workflow_from_mapping(data: dict[str, Any], *, source_path: str | None) -> WorkflowPlan:
+    metadata = _mapping(data.get("metadata"))
+    inputs = _mapping(data.get("inputs"))
+    outputs = _normalize_outputs(data.get("outputs"))
+    steps = _normalize_steps(data.get("steps"))
+    known = {key: data.get(key) for key in KNOWN_TOP_LEVEL}
+    extensions = {key: value for key, value in data.items() if key not in KNOWN_TOP_LEVEL}
+    return WorkflowPlan(
+        metadata=metadata,
+        intent=_intent(data.get("intent")),
+        inputs=inputs,
+        steps=steps,
+        outputs=outputs,
+        dependencies=list(data.get("dependencies") or []),
+        conditions=_mapping(data.get("conditions")),
+        artifacts=_mapping(data.get("artifacts")),
+        permissions=_mapping(data.get("permissions")),
+        resources=_mapping(data.get("resources")),
+        timeouts=_mapping(data.get("timeouts")),
+        retry_policies=_mapping(data.get("retry_policies")),
+        escalation_rules=_mapping(data.get("escalation_rules")),
+        observability=_mapping(data.get("observability")),
+        responsibilities=_mapping(data.get("responsibilities")),
+        extensions=extensions,
+        source_path=source_path,
+    )
+
+
+def _normalize_steps(raw_steps: Any) -> list[dict[str, Any]]:
+    if raw_steps is None:
+        return []
+    if isinstance(raw_steps, dict):
+        return [dict(spec or {}) | {"id": step_id} for step_id, spec in raw_steps.items()]
+    if isinstance(raw_steps, list):
+        steps: list[dict[str, Any]] = []
+        for item in raw_steps:
+            if not isinstance(item, dict):
+                raise WorkflowError("Workflow steps list must contain mappings")
+            steps.append(dict(item))
+        return steps
+    raise WorkflowError("Workflow `steps` must be a mapping or list")
+
+
+def _normalize_outputs(raw_outputs: Any) -> dict[str, dict[str, Any]]:
+    if raw_outputs is None:
+        return {}
+    if isinstance(raw_outputs, dict):
+        return {str(output_id): dict(spec or {}) for output_id, spec in raw_outputs.items()}
+    if isinstance(raw_outputs, list):
+        outputs: dict[str, dict[str, Any]] = {}
+        for item in raw_outputs:
+            if not isinstance(item, dict) or not item.get("id"):
+                raise WorkflowError("Workflow output list entries require `id`")
+            outputs[str(item["id"])] = dict(item)
+        return outputs
+    raise WorkflowError("Workflow `outputs` must be a mapping or list")
+
+
+def _input_paths(spec: dict[str, Any], base_dir: Path) -> list[Path]:
+    paths: list[Path] = []
+    if spec.get("file") or spec.get("path"):
+        paths.append(_safe_input_path(base_dir, spec.get("file") or spec.get("path")))
+    for raw_path in spec.get("files") or []:
+        paths.append(_safe_input_path(base_dir, raw_path))
+    if spec.get("glob"):
+        pattern = str((base_dir / str(spec["glob"])).resolve())
+        paths.extend(Path(path) for path in glob.glob(pattern, recursive=bool(spec.get("recursive", False))))
+    if spec.get("directory"):
+        paths.extend(scan_markdown_files([_safe_dir(base_dir, spec["directory"])], recursive=bool(spec.get("recursive", True))))
+    return sorted({path.resolve() for path in paths if path.exists() and path.is_file()})
+
+
+def _extract_specs(raw_extract: Any) -> dict[str, dict[str, Any]]:
+    if raw_extract is None:
+        return {}
+    if not isinstance(raw_extract, dict):
+        raise WorkflowError("Input `extract` must be a mapping")
+    specs: dict[str, dict[str, Any]] = {}
+    for name, spec in raw_extract.items():
+        if isinstance(spec, str):
+            specs[str(name)] = {"selector": spec}
+        elif isinstance(spec, dict) and spec.get("selector"):
+            specs[str(name)] = dict(spec)
+        else:
+            raise WorkflowError(f"Input extract `{name}` requires a selector")
+    return specs
+
+
+def _ordered_steps(steps: list[dict[str, Any]], diagnostics: list[Diagnostic]) -> list[dict[str, Any]]:
+    by_id = {str(step.get("id")): step for step in steps if step.get("id")}
+    ordered: list[dict[str, Any]] = []
+    temporary: set[str] = set()
+    permanent: set[str] = set()
+
+    def visit(step_id: str) -> None:
+        if step_id in permanent:
+            return
+        if step_id in temporary:
+            diagnostics.append(_diagnostic("workflow.dependency_cycle", f"Workflow dependency cycle includes `{step_id}`."))
+            return
+        step = by_id.get(step_id)
+        if step is None:
+            diagnostics.append(_diagnostic("workflow.unknown_step_dependency", f"Unknown workflow step dependency `{step_id}`."))
+            return
+        temporary.add(step_id)
+        for dep in _as_list(step.get("depends_on")):
+            visit(str(dep))
+        temporary.remove(step_id)
+        permanent.add(step_id)
+        ordered.append(step)
+
+    for step in steps:
+        if step.get("id"):
+            visit(str(step["id"]))
+    return ordered
+
+
+def _query_like_step(step: dict[str, Any], selector: str, *, query: bool) -> list[Any]:
+    source = step.get("source", step.get("input"))
+    engine = str(step.get("engine", "selector"))
+    documents = _documents_from_source(source)
+    results: list[Any] = []
+    for document in documents:
+        if query:
+            results.extend(match.to_dict() for match in query_document_with_engine(document, selector, engine=engine))
+        else:
+            results.extend(extract_document_with_engine(document, selector, engine=engine))
+    return results
+
+
+def _documents_from_source(source: Any) -> list[Document]:
+    if isinstance(source, dict) and "items" in source:
+        return [Document.from_dict(item["document"]) for item in source["items"] if isinstance(item, dict) and "document" in item]
+    if isinstance(source, dict) and "document" in source:
+        return [Document.from_dict(source["document"])]
+    if isinstance(source, dict) and {"headings", "blocks", "sections"} <= set(source):
+        return [Document.from_dict(source)]
+    raise WorkflowError("query/extract step requires a source collection or document")
+
+
+def _template_text(step: dict[str, Any], base_dir: Path) -> str:
+    if step.get("template_text") is not None:
+        return str(step["template_text"])
+    if step.get("template"):
+        return _safe_input_path(base_dir, step["template"]).read_text(encoding="utf-8")
+    raise WorkflowError("template step requires `template` or `template_text`")
+
+
+def _markdown_input(step: dict[str, Any], base_dir: Path) -> str:
+    if step.get("markdown") is not None:
+        return str(step["markdown"])
+    if step.get("input") is not None:
+        return _format_output_value(step["input"])
+    if step.get("file"):
+        return _safe_input_path(base_dir, step["file"]).read_text(encoding="utf-8")
+    raise WorkflowError("step requires `markdown`, `input`, or `file`")
+
+
+def _base_context(plan: WorkflowPlan, sources: dict[str, Any], steps: dict[str, Any]) -> dict[str, Any]:
+    return {
+        "metadata": plan.metadata,
+        "intent": plan.intent,
+        "sources": sources,
+        "steps": steps,
+        "artifacts": plan.artifacts,
+        "workflow": plan.to_dict(),
+    }
+
+
+def _resolve_path(context: dict[str, Any], path: str) -> Any:
+    current: Any = context
+    for part in path.split("."):
+        if isinstance(current, dict) and part in current:
+            current = current[part]
+        elif isinstance(current, list):
+            if part.isdigit():
+                current = current[int(part)]
+            else:
+                current = [
+                    item[part]
+                    for item in current
+                    if isinstance(item, dict) and part in item
+                ]
+        else:
+            raise WorkflowError(f"Cannot resolve workflow binding `${{{path}}}`")
+    return current
+
+
+def _matches_where(document: dict[str, Any], where: dict[str, Any]) -> bool:
+    context = {"frontmatter": document.get("frontmatter", {}), "document": document}
+    for path, expected in where.items():
+        try:
+            value = _resolve_path(context, str(path))
+        except WorkflowError:
+            return False
+        if value != expected:
+            return False
+    return True
+
+
+def _safe_input_path(base_dir: Path, raw_path: Any) -> Path:
+    if not raw_path:
+        raise WorkflowError("Expected path")
+    path = (base_dir / str(raw_path)).resolve()
+    if not _is_within(path, base_dir):
+        raise WorkflowError(f"Path escapes workflow directory: {raw_path}")
+    if not path.exists():
+        raise WorkflowError(f"Path does not exist: {raw_path}")
+    return path
+
+
+def _safe_dir(base_dir: Path, raw_path: Any) -> Path:
+    path = _safe_input_path(base_dir, raw_path)
+    if not path.is_dir():
+        raise WorkflowError(f"Expected directory: {raw_path}")
+    return path
+
+
+def _safe_output_path(output_dir: Path, raw_path: Any) -> Path:
+    path = (output_dir / str(raw_path)).resolve()
+    if not _is_within(path, output_dir):
+        raise WorkflowError(f"Output path escapes output directory: {raw_path}")
+    return path
+
+
+def _is_within(path: Path, root: Path) -> bool:
+    try:
+        path.relative_to(root)
+        return True
+    except ValueError:
+        return False
+
+
+def _relative(path: Path, root: Path) -> str:
+    try:
+        return path.resolve().relative_to(root).as_posix()
+    except ValueError:
+        return str(path)
+
+
+def _mapping(value: Any) -> dict[str, Any]:
+    if value is None:
+        return {}
+    if isinstance(value, dict):
+        return dict(value)
+    raise WorkflowError("Expected mapping")
+
+
+def _intent(value: Any) -> dict[str, Any]:
+    if value is None:
+        return {}
+    if isinstance(value, str):
+        return {"summary": value}
+    if isinstance(value, dict):
+        return dict(value)
+    raise WorkflowError("Workflow `intent` must be a string or mapping")
+
+
+def _as_list(value: Any) -> list[Any]:
+    if value is None:
+        return []
+    if isinstance(value, list):
+        return value
+    return [value]
+
+
+def _format_output_value(value: Any) -> str:
+    if value is None:
+        return ""
+    if isinstance(value, str):
+        return value
+    if isinstance(value, list):
+        return "\n".join(f"- {_format_output_value(item)}" for item in value)
+    if isinstance(value, dict):
+        return yaml.safe_dump(value, sort_keys=False).strip()
+    return str(value)
+
+
+def _diagnostic(
+    code: str,
+    message: str,
+    *,
+    severity: str = "error",
+    details: dict[str, Any] | None = None,
+) -> Diagnostic:
+    return Diagnostic(
+        severity=severity,
+        code=code,
+        message=message,
+        source=SourceLocation(),
+        details=details or {},
+    )
diff --git a/tests/test_builtin_extension_catalog.py b/tests/test_builtin_extension_catalog.py
index d9e2185..ca7a037 100644
--- a/tests/test_builtin_extension_catalog.py
+++ b/tests/test_builtin_extension_catalog.py
@@ -13,6 +13,7 @@ def test_builtin_extension_registry_lists_query_processors_and_backend():
     assert "processor.uppercase" in ids
     assert "processor.include" in ids
     assert "backend.local-sqlite" in ids
+    assert "workflow.markdown-dataflow" in ids
 
 
 def test_builtin_processor_descriptors_capture_safety_and_provenance():
@@ -48,3 +49,18 @@ def test_builtin_local_sqlite_descriptor_exposes_backend_capabilities():
         "mkt cache query",
         "mkt search",
     ]
+
+
+def test_builtin_workflow_descriptor_exposes_cli_and_safety():
+    registry = builtin_extension_registry()
+
+    descriptor = registry.get("workflow.markdown-dataflow")
+
+    assert descriptor.kind == "workflow-engine"
+    assert descriptor.safety["writes_output_files"] is True
+    assert descriptor.safety["assisted_generation"] == "adapter-only"
+    assert descriptor.cli["commands"] == [
+        "mkt workflow inspect",
+        "mkt workflow plan",
+        "mkt workflow run",
+    ]
diff --git a/tests/test_workflow_engine.py b/tests/test_workflow_engine.py
new file mode 100644
index 0000000..2861a0e
--- /dev/null
+++ b/tests/test_workflow_engine.py
@@ -0,0 +1,228 @@
+from pathlib import Path
+
+from click.testing import CliRunner
+
+from markitect_tool.cli import main
+from markitect_tool.generation import GenerationHookRequest, GenerationHookResult
+from markitect_tool.workflow import (
+    WorkflowRunner,
+    load_workflow_file,
+    resolve_workflow_bindings,
+)
+
+
+WORKFLOW = """# ADR Release Workflow
+
+```yaml workflow
+metadata:
+  id: adr-release
+  title: ADR Release Notes
+intent:
+  summary: Collect accepted ADR decisions.
+permissions:
+  filesystem:
+    read: [adrs, templates]
+    write: [out]
+responsibilities:
+  agent:
+    may_run_deterministic_steps: true
+inputs:
+  adrs:
+    glob: adrs/*.md
+    where:
+      frontmatter.status: accepted
+    extract:
+      decisions:
+        selector: sections[heading=Decision]
+steps:
+  render:
+    kind: template
+    template: templates/release.md
+    data:
+      decisions: ${sources.adrs.extracts.decisions}
+outputs:
+  release_notes:
+    path: out/release-notes.md
+    content: ${steps.render.markdown}
+observability:
+  events: [workflow.started, workflow.completed]
+```
+"""
+
+
+def _write_workflow_fixture(tmp_path: Path) -> Path:
+    (tmp_path / "adrs").mkdir()
+    (tmp_path / "templates").mkdir()
+    (tmp_path / "adrs" / "one.md").write_text(
+        "---\nstatus: accepted\n---\n# One\n\n## Decision\n\nUse the workflow engine.\n",
+        encoding="utf-8",
+    )
+    (tmp_path / "adrs" / "two.md").write_text(
+        "---\nstatus: proposed\n---\n# Two\n\n## Decision\n\nIgnore this one.\n",
+        encoding="utf-8",
+    )
+    (tmp_path / "templates" / "release.md").write_text(
+        "# Release Notes\n\n{{decisions}}\n",
+        encoding="utf-8",
+    )
+    workflow = tmp_path / "workflow.md"
+    workflow.write_text(WORKFLOW, encoding="utf-8")
+    return workflow
+
+
+def test_load_workflow_file_preserves_standard_sections(tmp_path: Path):
+    workflow = _write_workflow_fixture(tmp_path)
+
+    plan = load_workflow_file(workflow)
+
+    assert plan.id == "adr-release"
+    assert plan.intent["summary"] == "Collect accepted ADR decisions."
+    assert plan.permissions["filesystem"]["read"] == ["adrs", "templates"]
+    assert plan.responsibilities["agent"]["may_run_deterministic_steps"] is True
+    assert plan.observability["events"] == ["workflow.started", "workflow.completed"]
+    assert plan.steps[0]["id"] == "render"
+
+
+def test_workflow_runner_collects_sources_and_renders_output(tmp_path: Path):
+    workflow = _write_workflow_fixture(tmp_path)
+    plan = load_workflow_file(workflow)
+
+    result = WorkflowRunner(plan).run(dry_run=True)
+
+    assert result.valid
+    assert result.sources["adrs"]["count"] == 1
+    assert "Use the workflow engine." in result.sources["adrs"]["extracts"]["decisions"][0]
+    assert result.steps["render"]["complete"]
+    assert result.outputs[0].path.endswith("out/release-notes.md")
+    assert not result.outputs[0].written
+    assert "Ignore this one" not in result.outputs[0].content
+
+
+def test_workflow_runner_writes_outputs_under_output_dir(tmp_path: Path):
+    workflow = _write_workflow_fixture(tmp_path)
+    plan = load_workflow_file(workflow)
+    output_dir = tmp_path / "build"
+
+    result = WorkflowRunner(plan, output_dir=output_dir).run()
+
+    assert result.valid
+    output = output_dir / "out" / "release-notes.md"
+    assert output.exists()
+    assert "Use the workflow engine" in output.read_text(encoding="utf-8")
+    assert result.outputs[0].written
+
+
+def test_resolve_workflow_bindings_preserves_native_types_and_projects_lists():
+    context = {
+        "sources": {
+            "docs": {
+                "items": [
+                    {"path": "a.md", "frontmatter": {"status": "accepted"}},
+                    {"path": "b.md", "frontmatter": {"status": "proposed"}},
+                ],
+            }
+        }
+    }
+
+    value = resolve_workflow_bindings(
+        {
+            "paths": "${sources.docs.items.path}",
+            "sentence": "Files: ${sources.docs.items.path}",
+        },
+        context,
+    )
+
+    assert value["paths"] == ["a.md", "b.md"]
+    assert value["sentence"] == "Files: - a.md\n- b.md"
+
+
+def test_optional_assisted_step_skips_without_hook(tmp_path: Path):
+    workflow = tmp_path / "workflow.yaml"
+    workflow.write_text(
+        """
+metadata:
+  id: assisted-demo
+steps:
+  review:
+    kind: assisted
+    optional: true
+    prompt_text: Review this.
+outputs:
+  review:
+    content: ${steps.review.skipped}
+""",
+        encoding="utf-8",
+    )
+
+    result = WorkflowRunner(load_workflow_file(workflow)).run(dry_run=True)
+
+    assert result.valid
+    assert result.steps["review"]["skipped"] is True
+    assert result.steps["review"]["diagnostics"][0]["code"] == "workflow.assisted_unavailable"
+
+
+class _FakeHook:
+    def generate(self, request: GenerationHookRequest) -> GenerationHookResult:
+        return GenerationHookResult(
+            markdown=f"Reviewed: {request.prompt}",
+            provider="fake",
+        )
+
+
+def test_assisted_step_uses_injected_hook(tmp_path: Path):
+    workflow = tmp_path / "workflow.yaml"
+    workflow.write_text(
+        """
+metadata:
+  id: assisted-demo
+steps:
+  review:
+    kind: assisted
+    optional: false
+    prompt_text: Review this.
+outputs:
+  review:
+    content: ${steps.review.markdown}
+""",
+        encoding="utf-8",
+    )
+
+    result = WorkflowRunner(load_workflow_file(workflow), assisted_hook=_FakeHook()).run(dry_run=True)
+
+    assert result.valid
+    assert result.steps["review"]["provider"] == "fake"
+    assert result.outputs[0].content == "Reviewed: Review this."
+
+
+def test_mkt_workflow_inspect_plan_and_run(tmp_path: Path):
+    workflow = _write_workflow_fixture(tmp_path)
+    runner = CliRunner()
+
+    inspected = runner.invoke(main, ["workflow", "inspect", str(workflow)])
+    planned = runner.invoke(main, ["workflow", "plan", str(workflow)])
+    run = runner.invoke(main, ["workflow", "run", str(workflow), "--output-dir", str(tmp_path / "build")])
+
+    assert inspected.exit_code == 0
+    assert "valid" in inspected.output
+    assert planned.exit_code == 0
+    assert "outputs: 1" in planned.output
+    assert run.exit_code == 0
+    assert "written" in run.output
+
+
+def test_example_adr_release_notes_workflow_runs(tmp_path: Path):
+    workflow = Path("examples/workflows/adr-release-notes.workflow.md")
+    result = WorkflowRunner(load_workflow_file(workflow), output_dir=tmp_path).run()
+
+    assert result.valid
+    assert result.sources["adrs"]["count"] == 2
+    assert (tmp_path / "out" / "release-notes.md").exists()
+    assert "local SQLite backend" in (tmp_path / "out" / "release-notes.md").read_text(encoding="utf-8")
+
+
+def test_example_assisted_review_workflow_is_deterministic_without_hook(tmp_path: Path):
+    workflow = Path("examples/workflows/assisted-review.workflow.md")
+    result = WorkflowRunner(load_workflow_file(workflow), output_dir=tmp_path).run(dry_run=True)
+
+    assert result.valid
+    assert result.steps["review"]["skipped"] is True
diff --git a/workplans/MKTT-WP-0011-markdown-dataflow-pipeline-workflows.md b/workplans/MKTT-WP-0011-markdown-dataflow-pipeline-workflows.md
index 7cf8d96..53f0a71 100644
--- a/workplans/MKTT-WP-0011-markdown-dataflow-pipeline-workflows.md
+++ b/workplans/MKTT-WP-0011-markdown-dataflow-pipeline-workflows.md
@@ -3,7 +3,7 @@ id: MKTT-WP-0011
 type: workplan
 title: "Markdown Dataflow Pipeline Workflows"
 domain: markitect
-status: todo
+status: done
 owner: markitect-tool
 topic_slug: markitect
 planning_priority: P2
@@ -51,7 +51,7 @@ See `docs/markdown-dataflow-workflow-assessment.md`.
 
 ```task
 id: MKTT-WP-0011-T001
-status: todo
+status: done
 priority: high
 state_hub_task_id: "c335cbaa-dfb9-4df5-b1ae-87aaf6097bd8"
 ```
@@ -61,11 +61,18 @@ steps, outputs, variables, dry-run behavior, diagnostics, and provenance.
 
 Output: workflow schema, examples, and validation diagnostics.
 
+Implemented: `docs/workflow-definition-standard.md` defines the workflow
+standard with metadata, intent, inputs, outputs, steps, dependencies,
+conditions, artifacts, permissions, resource requirements, timeouts, retry
+policies, escalation rules, observability events, and human/agent/system
+responsibility boundaries. `WorkflowPlan` preserves all standard sections and
+unknown extension fields.
+
 ## P11.2 - Implement Markdown source collectors
 
 ```task
 id: MKTT-WP-0011-T002
-status: todo
+status: done
 priority: high
 state_hub_task_id: "16a89801-d96d-437f-a883-81d09586f47a"
 ```
@@ -75,11 +82,15 @@ selectors, sections, blocks, metrics, and future reference/index backends.
 
 Output: source collector API, selector integration, and tests.
 
+Implemented: workflow inputs collect `file`, `path`, `files`, `glob`, and
+`directory` Markdown sources, support frontmatter filters, metrics,
+frontmatter, selectors, and named extractions.
+
 ## P11.3 - Implement deterministic step registry
 
 ```task
 id: MKTT-WP-0011-T003
-status: todo
+status: done
 priority: high
 state_hub_task_id: "808bed93-c7e2-4b34-90f4-f6f961fef503"
 ```
@@ -89,11 +100,15 @@ render, contract stub generation, contract checks, and data shaping.
 
 Output: deterministic workflow runner with dependency ordering.
 
+Implemented: deterministic workflow runner supports dependency ordering and
+step kinds `shape`, `extract`, `query`, `template`, `compose`, `transform`,
+`include`, `contract_stub`, `contract_check`, and `assisted` boundary.
+
 ## P11.4 - Implement data expression and binding model
 
 ```task
 id: MKTT-WP-0011-T004
-status: todo
+status: done
 priority: high
 state_hub_task_id: "ea1ad9d2-3668-4b65-afb4-f490e5bfd0c6"
 ```
@@ -103,11 +118,15 @@ for example `${sources.adrs.decisions}` or `${steps.summary.markdown}`.
 
 Output: expression resolver, type checks, and missing-reference diagnostics.
 
+Implemented: `${...}` bindings preserve native types for full-expression
+values, interpolate text inside longer strings, support dictionary paths,
+numeric list indexes, and list projection over dictionaries.
+
 ## P11.5 - Add optional assisted processing step boundary
 
 ```task
 id: MKTT-WP-0011-T005
-status: todo
+status: done
 priority: medium
 state_hub_task_id: "ed1adc60-fdd8-4d4c-b4d7-7ce906e641c6"
 ```
@@ -118,11 +137,15 @@ dry-run, optional steps, and policy gates before sending data to a provider.
 
 Output: hook adapter interface and tests with fake providers.
 
+Implemented: assisted steps use the provider-neutral generation hook boundary.
+Without a hook, optional assisted steps are skipped with warning diagnostics and
+required assisted steps fail. Tests include an injected fake hook.
+
 ## P11.6 - Implement multi-output sinks
 
 ```task
 id: MKTT-WP-0011-T006
-status: todo
+status: done
 priority: high
 state_hub_task_id: "902707d7-46fe-45d6-a9ec-b85763065ff9"
 ```
@@ -133,11 +156,15 @@ their source data.
 
 Output: output sink API, path-safety checks, and provenance manifests.
 
+Implemented: outputs can render content or templates, write multiple Markdown
+files under a safe output root, support dry-run planning, and emit output
+records plus provenance/trace events.
+
 ## P11.7 - Add workflow CLI
 
 ```task
 id: MKTT-WP-0011-T007
-status: todo
+status: done
 priority: high
 state_hub_task_id: "ccc26867-5724-4205-b3fe-a8b9d046775d"
 ```
@@ -152,11 +179,19 @@ mkt workflow run <workflow.md>
 
 Include JSON/YAML outputs for agent use.
 
+Implemented:
+
+- `mkt workflow inspect <workflow.md>`
+- `mkt workflow plan <workflow.md>`
+- `mkt workflow run <workflow.md>`
+
+All commands support text, JSON, and YAML output.
+
 ## P11.8 - Add representative end-to-end examples
 
 ```task
 id: MKTT-WP-0011-T008
-status: todo
+status: done
 priority: high
 state_hub_task_id: "f8501ea6-1ead-477d-8f64-c196e7edfe68"
 ```
@@ -168,6 +203,9 @@ Create examples covering:
 - source snippets -> docs
 - deterministic summary -> optional assisted review -> final Markdown
 
+Implemented: examples under `examples/workflows/` cover ADR release notes,
+source snippet extraction, and an optional assisted review boundary.
+
 ## Exit Criteria
 
 - A non-programmer can write a Markdown/YAML workflow that extracts data from