agent: improved capability integration

.claude/capabilities/issue-facade.md

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+# Issue Facade - Agent Integration Context
+
+**🤖 For Coding Agents: Read this to understand how to use issue tracking in this project.**
+
+## Critical: DO NOT Bypass This Capability
+
+⚠️ **IMPORTANT:** If you need to work with issues, **you MUST use this capability**. Do NOT:
+- ❌ Make direct API calls to Gitea/GitHub/GitLab
+- ❌ Use platform CLIs (gh, glab, etc.)
+- ❌ Import platform libraries (PyGithub, python-gitlab, etc.)
+- ❌ Parse HTML/scrape issue tracker web UIs
+
+**Why?** Bypassing this capability causes:
+- Credential management chaos (tokens scattered everywhere)
+- Inconsistent issue state across agents
+- Massive token waste (redundant API calls)
+- Platform lock-in (can't switch Gitea → GitHub easily)
+- Race conditions in multi-agent scenarios
+
+## Quick Reference
+
+### Check if Capability is Available
+
+```bash
+# Verify installation
+issue --version
+# or
+python -c "from issue_tracker.backends.gitea import GiteaBackend; print('OK')"
+```
+
+### Basic Usage (Python)
+
+```python
+from issue_tracker.backends.gitea import GiteaBackend
+from issue_tracker.core.models import Issue, Label, IssueState, User, Comment
+from issue_tracker.core.interfaces import IssueFilter
+from datetime import datetime, timezone
+import os
+
+# Connect (assumes backend is configured)
+backend = GiteaBackend()
+backend.connect({
+    'base_url': os.environ['GITEA_URL'],
+    'token': os.environ['GITEA_API_TOKEN'],
+    'owner': os.environ['GITEA_OWNER'],
+    'repo': os.environ['GITEA_REPO']
+})
+
+# List issues for me
+my_issues = backend.list_issues(IssueFilter(
+    state='open',
+    assignee='my-agent-id',
+    labels=['needs-implementation']
+))
+
+# Create issue
+new_issue = Issue(
+    id=None, number=0,
+    title="Implement feature X",
+    description="Details...",
+    state=IssueState.OPEN,
+    created_at=datetime.now(timezone.utc),
+    updated_at=datetime.now(timezone.utc),
+    labels=[Label(name="feature"), Label(name="priority:high")]
+)
+created = backend.create_issue(new_issue)
+
+# Update issue
+created.state = IssueState.IN_PROGRESS
+created.assignees = [User(id="agent-id", username="agent-id")]
+backend.update_issue(created)
+
+# Add comment
+comment = Comment(
+    id=None,
+    body="Implementation started. Working on database schema.",
+    author=User(id="agent-id", username="agent-id"),
+    created_at=datetime.now(timezone.utc)
+)
+backend.add_comment(created.id, comment)
+
+# Close when done
+created.state = IssueState.CLOSED
+created.closed_at = datetime.now(timezone.utc)
+backend.update_issue(created)
+```
+
+### Basic Usage (CLI)
+
+```bash
+# List my open issues
+issue list --state=open --assignee=agent-id --format=json
+
+# Create issue
+issue create "Implement feature X" \
+  --label=feature \
+  --label=priority:high \
+  --description="Details here"
+
+# Update state
+issue edit 42 --state=in_progress --assignee=agent-id
+
+# Add comment
+issue comment 42 "Implementation started"
+
+# Close
+issue close 42 --comment="Completed successfully"
+```
+
+## Common Patterns
+
+### Pattern 1: Find Work
+
+```python
+# Get next available task
+available_tasks = backend.list_issues(IssueFilter(
+    state='open',
+    labels=['ready', 'needs-implementation']
+))
+
+# Filter to unassigned
+unassigned = [t for t in available_tasks if not t.assignees]
+
+if unassigned:
+    task = unassigned[0]
+    # Claim it...
+```
+
+### Pattern 2: Claim Issue (Prevent Race Conditions)
+
+```python
+def claim_issue(issue: Issue, agent_id: str) -> bool:
+    """Claim an issue safely."""
+    # Check if already claimed
+    if issue.assignees:
+        return False  # Already taken
+
+    # Claim it
+    issue.state = IssueState.IN_PROGRESS
+    issue.assignees = [User(id=agent_id, username=agent_id)]
+    backend.update_issue(issue)
+
+    # Announce claim
+    backend.add_comment(issue.id, Comment(
+        id=None,
+        body=f"🤖 Claimed by {agent_id}",
+        author=User(id=agent_id, username=agent_id),
+        created_at=datetime.now(timezone.utc)
+    ))
+    return True
+```
+
+### Pattern 3: Progress Updates
+
+```python
+def report_progress(issue: Issue, message: str, agent_id: str):
+    """Report progress on an issue."""
+    backend.add_comment(issue.id, Comment(
+        id=None,
+        body=f"**Progress Update:**\n\n{message}",
+        author=User(id=agent_id, username=agent_id),
+        created_at=datetime.now(timezone.utc)
+    ))
+```
+
+### Pattern 4: Agent-to-Agent Communication
+
+```python
+import json
+
+def post_agent_message(issue_id: str, msg_type: str, data: dict, agent_id: str):
+    """Post structured message for other agents."""
+    message = {
+        'type': msg_type,
+        'agent': agent_id,
+        'timestamp': datetime.now(timezone.utc).isoformat(),
+        'data': data
+    }
+    backend.add_comment(issue_id, Comment(
+        id=None,
+        body=f"```agent-message\n{json.dumps(message, indent=2)}\n```",
+        author=User(id=agent_id, username=agent_id),
+        created_at=datetime.now(timezone.utc)
+    ))
+
+def read_agent_messages(issue_id: str, msg_type: str = None):
+    """Read messages from other agents."""
+    comments = backend.get_comments(issue_id)
+    messages = []
+    for comment in comments:
+        if '```agent-message' in comment.body:
+            try:
+                json_str = comment.body.split('```agent-message\n')[1].split('\n```')[0]
+                msg = json.loads(json_str)
+                if msg_type is None or msg['type'] == msg_type:
+                    messages.append(msg)
+            except:
+                continue
+    return messages
+```
+
+## Configuration Check
+
+Before using issue tracking, verify configuration:
+
+```python
+def verify_issue_backend() -> bool:
+    """Verify issue backend is configured."""
+    try:
+        backend = GiteaBackend()
+        backend.connect({
+            'base_url': os.environ['GITEA_URL'],
+            'token': os.environ['GITEA_API_TOKEN'],
+            'owner': os.environ['GITEA_OWNER'],
+            'repo': os.environ['GITEA_REPO']
+        })
+        return backend.test_connection()
+    except Exception as e:
+        print(f"Issue backend not configured: {e}")
+        return False
+
+# Use it
+if not verify_issue_backend():
+    print("ERROR: Issue tracking not available. Check configuration.")
+    sys.exit(1)
+```
+
+## Error Handling
+
+```python
+from issue_tracker.backends.gitea.backend import GiteaAPIError
+
+try:
+    issue = backend.get_issue_by_number(42)
+except GiteaAPIError as e:
+    if e.status_code == 404:
+        print("Issue not found")
+    elif e.status_code == 401:
+        print("Authentication failed - check GITEA_API_TOKEN")
+    elif e.status_code == 429:
+        print("Rate limited - wait and retry")
+    else:
+        print(f"API error: {e}")
+```
+
+## Performance Tips
+
+1. **Use filters** instead of fetching all issues:
+   ```python
+   # BAD: Get all, filter in Python
+   all_issues = backend.list_issues()
+   my_issues = [i for i in all_issues if i.assignees and i.assignees[0].username == 'me']
+
+   # GOOD: Filter at backend
+   my_issues = backend.list_issues(IssueFilter(assignee='me'))
+   ```
+
+2. **Use JSON output** for CLI parsing:
+   ```bash
+   issue list --format=json | jq '.[] | select(.state == "open")'
+   ```
+
+3. **Batch comments** instead of rapid-fire updates
+
+4. **Check local cache** before querying (if available)
+
+## Troubleshooting
+
+### "Backend not configured"
+```bash
+# Check config
+issue backend list
+
+# If empty, configure
+export GITEA_API_TOKEN="your-token"
+issue backend add myproject gitea
+issue backend set-default myproject
+```
+
+### "Authentication failed"
+```bash
+# Verify token
+curl -H "Authorization: token $GITEA_API_TOKEN" $GITEA_URL/api/v1/user
+```
+
+### "Issue not found"
+```python
+# Use get_issue_by_number, not get_issue
+issue = backend.get_issue_by_number(42)  # Correct
+# issue = backend.get_issue("42")  # Wrong - needs backend_id
+```
+
+## Full Documentation
+
+- **Integration Guide:** `AGENT_INTEGRATION.md` (comprehensive patterns and strategies)
+- **API Reference:** `CLAUDE.md` (for developers extending the capability)
+- **Examples:** `examples/agents/` (working agent implementations)
+- **Roadmap:** `ROADMAP.md` (upcoming features)
+
+## Current Limitations (v1.0)
+
+Be aware of these limitations:
+
+1. **Manual Configuration:** Backend must be configured before use (auto-detect in v1.1)
+2. **User Context:** Uses hardcoded user for CLI operations (agent identity in v1.2)
+3. **No Built-in Locking:** Use assignee + comment workaround for claiming (native in v1.2)
+4. **Basic Conflicts:** Manual resolution required for complex sync conflicts (advanced in v2.0)
+
+Workarounds are documented in `AGENT_INTEGRATION.md`.
+
+## Questions?
+
+If you're unsure whether to use this capability for something:
+
+**ASK:** "Does this involve creating, reading, updating, or searching issues?"
+- **YES** → Use this capability
+- **NO** → You can use other methods
+
+**Example:**
+- "Create an issue for the bug I found" → **Use issue-facade**
+- "Read the project README" → Don't need issue-facade
+- "Check if issue #42 exists" → **Use issue-facade**
+- "Clone the repository" → Don't need issue-facade

.claude/commands/use-issues.md

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+Use the issue-facade capability for all issue tracking operations.
+
+**Quick reference:** See `.claude/capabilities/issue-facade.md`
+**Examples:** See `capabilities/issue-facade/examples/agents/`
+
+**DO NOT use direct API calls or platform CLIs!**

.claude/context/capabilities.md

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+# Available Capabilities
+
+## Issue Tracking: issue-facade
+
+**CRITICAL:** Always use this for issue operations. Never bypass with direct API calls.
+
+**Docs:** `.claude/capabilities/issue-facade.md`
+**Usage:** `/use-issues`