diff --git a/api/routers/decisions.py b/api/routers/decisions.py
index cd676d9..c44802d 100644
--- a/api/routers/decisions.py
+++ b/api/routers/decisions.py
@@ -1,5 +1,6 @@
 import uuid
 from datetime import datetime, timezone
+from pathlib import Path
 
 from fastapi import APIRouter, Depends, HTTPException, status
 from sqlalchemy import select
@@ -7,7 +8,8 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from api.database import get_session
 from api.models.decision import Decision, DecisionStatus, DecisionType
-from api.schemas.decision import DecisionCreate, DecisionRead, DecisionUpdate
+from api.models.progress_event import ProgressEvent
+from api.schemas.decision import DecisionCreate, DecisionRead, DecisionResolve, DecisionUpdate
 
 router = APIRouter(prefix="/decisions", tags=["decisions"])
 
@@ -108,3 +110,87 @@ async def supersede_decision(
     await session.commit()
     await session.refresh(decision)
     return decision
+
+
+@router.post("/{decision_id}/resolve", response_model=DecisionRead)
+async def resolve_decision_action(
+    decision_id: uuid.UUID,
+    body: DecisionResolve,
+    session: AsyncSession = Depends(get_session),
+) -> Decision:
+    decision = await session.get(Decision, decision_id)
+    if decision is None:
+        raise HTTPException(status_code=404, detail="Decision not found")
+    if decision.status == DecisionStatus.resolved:
+        raise HTTPException(status_code=409, detail="Decision already resolved")
+
+    decision.status = DecisionStatus.resolved
+    decision.decision_type = DecisionType.made
+    decision.rationale = body.rationale
+    decision.decided_by = body.decided_by
+    decision.decided_at = datetime.now(tz=timezone.utc)
+    await session.commit()
+    await session.refresh(decision)
+
+    event = ProgressEvent(
+        topic_id=decision.topic_id,
+        workstream_id=decision.workstream_id,
+        decision_id=decision.id,
+        event_type="decision_resolved",
+        summary=f"Decision resolved: {decision.title}",
+        author=body.decided_by,
+        detail={"rationale": body.rationale},
+    )
+    session.add(event)
+    await session.commit()
+
+    if body.write_log:
+        await _write_project_log(decision, body.rationale, body.decided_by, session)
+
+    return decision
+
+
+async def _write_project_log(
+    decision: Decision, rationale: str, decided_by: str, session: AsyncSession
+) -> None:
+    """Append a DECISIONS.md entry to the registered project directory for this topic."""
+    if decision.topic_id is None:
+        return
+
+    rows = await session.execute(
+        select(ProgressEvent)
+        .where(ProgressEvent.topic_id == decision.topic_id)
+        .where(ProgressEvent.event_type == "milestone")
+        .order_by(ProgressEvent.created_at.desc())
+    )
+    project_path: str | None = None
+    for pe in rows.scalars():
+        if pe.summary and "Project registered with State Hub:" in pe.summary:
+            project_path = (pe.detail or {}).get("project_path")
+            if project_path:
+                break
+
+    if not project_path:
+        return
+
+    p = Path(project_path)
+    if not p.is_dir():
+        return
+
+    now = datetime.now(tz=timezone.utc)
+    entry = (
+        f"\n## {decision.title}\n\n"
+        f"**Date:** {now.strftime('%Y-%m-%d')}  \n"
+        f"**Decided by:** {decided_by}  \n\n"
+        f"{rationale}\n\n"
+        f"---\n"
+    )
+    log_file = p / "DECISIONS.md"
+    if log_file.exists():
+        log_file.write_text(log_file.read_text() + entry)
+    else:
+        log_file.write_text(
+            "# Decision Log\n\n"
+            "_Auto-generated by the Custodian State Hub._\n"
+            + entry
+        )
diff --git a/api/schemas/decision.py b/api/schemas/decision.py
index 6e52fe2..f02041f 100644
--- a/api/schemas/decision.py
+++ b/api/schemas/decision.py
@@ -26,6 +26,12 @@ class DecisionCreate(BaseModel):
         return self
 
 
+class DecisionResolve(BaseModel):
+    rationale: str
+    decided_by: str
+    write_log: bool = True  # append to DECISIONS.md in the registered project directory
+
+
 class DecisionUpdate(BaseModel):
     title: str | None = None
     description: str | None = None
diff --git a/dashboard/src/index.md b/dashboard/src/index.md
index b33c622..a289d50 100644
--- a/dashboard/src/index.md
+++ b/dashboard/src/index.md
@@ -209,12 +209,66 @@ const blocking = summary.blocking_decisions ?? [];
 if (blocking.length === 0) {
   display(html`<p style="color:green">✓ No blocking decisions.</p>`);
 } else {
-  display(Inputs.table(blocking.map(d => ({
-    Title:     d.title,
-    Status:    d.status,
-    Deadline:  d.deadline ? new Date(d.deadline).toLocaleDateString() : "—",
-    Escalated: d.escalation_note ? "⚠️" : "",
-  }))));
+  for (const d of blocking) {
+    const card = html`<div class="dec-card ${d.escalation_note ? 'dec-escalated' : ''}">
+      <div class="dec-header">
+        <span class="dec-title">${d.title}</span>
+        <span class="dec-meta">
+          ${d.escalation_note ? html`<span class="dec-warn-badge">⚠ escalated</span>` : ""}
+          ${d.deadline ? html`<span>Due ${new Date(d.deadline).toLocaleDateString()}</span>` : ""}
+        </span>
+      </div>
+      ${d.description ? html`<p class="dec-desc">${d.description}</p>` : ""}
+      ${d.rationale   ? html`<p class="dec-context"><strong>Context:</strong> ${d.rationale}</p>` : ""}
+      ${d.escalation_note ? html`<p class="dec-context dec-warn-text">${d.escalation_note}</p>` : ""}
+      <details class="dec-resolve">
+        <summary>Resolve this decision →</summary>
+        <div class="dec-resolve-inner">
+          <label>Your decision &amp; rationale</label>
+          <textarea class="r-text" rows="4" placeholder="State the chosen option and your reasoning…"></textarea>
+          <label>Decided by</label>
+          <input class="r-by" type="text" value="Bernd">
+          <div class="dec-resolve-actions">
+            <button class="r-submit">Record &amp; close</button>
+            <span class="r-msg"></span>
+          </div>
+        </div>
+      </details>
+    </div>`;
+
+    const btn  = card.querySelector(".r-submit");
+    const msg  = card.querySelector(".r-msg");
+    const det  = card.querySelector(".dec-resolve");
+
+    btn.addEventListener("click", async () => {
+      const rationale  = card.querySelector(".r-text").value.trim();
+      const decidedBy  = card.querySelector(".r-by").value.trim() || "Bernd";
+      if (!rationale) { msg.textContent = "⚠ Please enter a rationale."; return; }
+      btn.disabled = true; btn.textContent = "Saving…";
+      try {
+        const r = await fetch(`${API}/decisions/${d.id}/resolve`, {
+          method: "POST",
+          headers: {"Content-Type": "application/json"},
+          body: JSON.stringify({rationale, decided_by: decidedBy}),
+        });
+        if (r.ok) {
+          det.open = false;
+          det.querySelector("summary").textContent = "✓ Resolved — DECISIONS.md written, updates in next poll";
+          det.querySelector("summary").style.color = "green";
+          card.style.opacity = "0.55";
+        } else {
+          const err = await r.json().catch(() => ({}));
+          msg.textContent = `Error ${r.status}: ${err.detail ?? "unknown"}`;
+          btn.disabled = false; btn.textContent = "Record & close";
+        }
+      } catch (e) {
+        msg.textContent = `Network error: ${e.message}`;
+        btn.disabled = false; btn.textContent = "Record & close";
+      }
+    });
+
+    display(card);
+  }
 }
 ```
 
@@ -253,4 +307,23 @@ display(Inputs.table((summary.recent_progress ?? []).map(e => ({
 .warning { background: #fff3cd; border: 1px solid #ffc107; border-radius: 4px; padding: 0.75rem; }
 .hint-box { background: var(--theme-background-alt); border-left: 3px solid steelblue; border-radius: 4px; padding: 0.75rem 1rem; margin-top: 0.75rem; font-size: 0.9rem; }
 .hint-box code { background: var(--theme-background); padding: 0.15rem 0.4rem; border-radius: 3px; font-size: 0.85rem; }
+.dec-card { background: var(--theme-background-alt); border-radius: 8px; padding: 1rem 1.25rem; margin-bottom: 1rem; border-left: 4px solid steelblue; }
+.dec-card.dec-escalated { border-left-color: orange; }
+.dec-header { display: flex; align-items: baseline; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 0.5rem; }
+.dec-title { font-weight: 600; font-size: 1rem; }
+.dec-meta { font-size: 0.8rem; color: gray; display: flex; gap: 0.5rem; align-items: center; }
+.dec-warn-badge { background: orange; color: white; border-radius: 3px; padding: 0.1rem 0.35rem; font-size: 0.75rem; }
+.dec-desc { font-size: 0.9rem; margin: 0.4rem 0 0.25rem; white-space: pre-wrap; line-height: 1.5; }
+.dec-context { font-size: 0.85rem; color: gray; margin: 0.25rem 0; }
+.dec-warn-text { color: #b45309; }
+.dec-resolve { margin-top: 0.75rem; }
+.dec-resolve summary { cursor: pointer; font-size: 0.85rem; color: steelblue; user-select: none; }
+.dec-resolve-inner { display: flex; flex-direction: column; gap: 0.4rem; margin-top: 0.6rem; }
+.dec-resolve-inner label { font-size: 0.8rem; font-weight: 600; color: gray; }
+.dec-resolve-inner textarea { width: 100%; box-sizing: border-box; padding: 0.4rem; border-radius: 4px; border: 1px solid var(--theme-foreground-faint); background: var(--theme-background); font-family: inherit; font-size: 0.875rem; resize: vertical; }
+.dec-resolve-inner input[type=text] { width: 220px; padding: 0.3rem 0.5rem; border-radius: 4px; border: 1px solid var(--theme-foreground-faint); background: var(--theme-background); font-family: inherit; font-size: 0.875rem; }
+.dec-resolve-actions { display: flex; align-items: center; gap: 0.75rem; margin-top: 0.25rem; }
+.dec-resolve-actions button { padding: 0.35rem 0.9rem; border-radius: 4px; border: none; background: steelblue; color: white; cursor: pointer; font-size: 0.875rem; }
+.dec-resolve-actions button:disabled { opacity: 0.5; cursor: default; }
+.r-msg { font-size: 0.8rem; color: #b45309; }
 </style>