coord_post_update · Session Coord MCP: Risk & Policy

WHAT IT DOES

What coord_post_update does on Session Coord

AI agents use coord_post_update to create or update resources in Session Coord — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Session Coord environment.

WHY IT NEEDS A POLICY

Why coord_post_update needs a policy

This tool writes status and progress information to a coordination system for parallel coding sessions. It creates new update records or modifies state in a way that is reversible and informational in nature. The impact is scoped to session coordination metadata rather than the actual codebase, and updates can be corrected or superseded by subsequent posts.

From the tool's definition Tool description states 'Post a progress, blocker, warning, or handoff update', indicating it creates or modifies coordination metadata without irreversible deletion or financial consequences.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

coord_post_update Rate-limited

coord_post_update stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "coord_post_update": {
      "limits": [
        {
          "counter": "coord_post_update_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Session Coord, so you can run agents against it safely.

FAQ

Questions about coord_post_update

What does the coord_post_update tool do? +

Post a progress, blocker, warning, or handoff update. It is categorised as a Write tool in the Session Coord MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on coord_post_update? +

Register the Session Coord MCP server in PolicyLayer and add a rule for coord_post_update: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Session Coord. Nothing to install.

What risk level is coord_post_update? +

coord_post_update is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit coord_post_update? +

Yes. Add a rate_limit block to the coord_post_update rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block coord_post_update completely? +

Set action: deny in the PolicyLayer policy for coord_post_update. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides coord_post_update? +

coord_post_update is provided by the Session Coord MCP server (lingfeng-vels/session-coord-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.