openspec_save_proposal

THE RISK

Medium Risk

Why openspec_save_proposal needs a policy

This tool creates or stores new proposal and task records in the OpenSpec system. It modifies system state by adding new data but does not delete, execute external code, or trigger financial transactions. The reversible nature (evidenced by sibling archive/update capabilities) places it in Write rather than Destructive.

From the tool's definition Tool name 'openspec_save_proposal' and description 'Save a generated proposal and tasks to a new change' indicate creation of new data records (proposals and tasks).

Documented attack patterns abuse exactly the kind of access openspec_save_proposal gives an agent:

POLICY

How to control openspec_save_proposal

PolicyLayer is an MCP gateway — it sits between your AI agents and OpenSpec MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for openspec_save_proposal:

policy.json

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

openspec_save_proposal 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.

Create a free account and register OpenSpec MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

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EXPLORE

Related tools and policies

More OpenSpec MCP tools

Execute openspec_setup_hooks Install or uninstall OpenSpec Git hooks Write openspec_record_revision Record a design revision when fixing bugs or adjusting design that deviates from the origi Write openspec_reply_review Reply to a review comment Write openspec_request_approval Request approval for a change Write openspec_sync_revisions Sync recorded revisions to design.md or proposal.md before archiving Write openspec_add_review Add a review comment to a change or spec Write openspec_approve_change Approve a change Write openspec_archive_change Archive a completed change proposal. Automatically syncs revisions to design.md before arc

All 40 OpenSpec MCP tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about openspec_save_proposal

What does the openspec_save_proposal tool do? +

Save a generated proposal and tasks to a new change. It is categorised as a Write tool in the OpenSpec MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on openspec_save_proposal? +

Register the OpenSpec MCP server in PolicyLayer and add a rule for openspec_save_proposal: 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 OpenSpec MCP. Nothing to install.

What risk level is openspec_save_proposal? +

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

Can I rate-limit openspec_save_proposal? +

Yes. Add a rate_limit block to the openspec_save_proposal 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 openspec_save_proposal completely? +

Set action: deny in the PolicyLayer policy for openspec_save_proposal. 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 openspec_save_proposal? +

openspec_save_proposal is provided by the OpenSpec MCP server (lumiaqian/openspec-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every OpenSpec MCP tool call.

Start from OpenSpec MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →