Medium Risk

`linear_add_comment`

Add comments to issues

Part of the Linearapp server.

`linear_add_comment` can modify Linearapp data, with no limits today. PolicyLayer puts allow, deny, and rate-limit rules on every call. Live in minutes.

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AI agents use `linear_add_comment` to create or modify resources in Linearapp. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.

Without a policy, an AI agent could call `linear_add_comment` repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Linearapp.

Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.

policy.json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "`linear_add_comment`": {
      "limits": [
        {
          "counter": "`linear_add_comment`_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

See the full Linearapp policy for all 24 tools.

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These attack patterns abuse exactly the kind of access `linear_add_comment` gives an agent. Each links to the full case and the policy that stops it:

Browse the full MCP Attack Database →

Every attack above starts with a tool call. PolicyLayer checks each one against your policy first, so `linear_add_comment` only ever does what you allow.

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Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.

What does the `linear_add_comment` tool do? +

Add comments to issues. It is categorised as a Write tool in the Linearapp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on `linear_add_comment`? +

Register the Linearapp MCP server in PolicyLayer and add a rule for `linear_add_comment`: 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 Linearapp. Nothing to install.

What risk level is `linear_add_comment`? +

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

Can I rate-limit `linear_add_comment`? +

Yes. Add a rate_limit block to the `linear_add_comment` 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 `linear_add_comment` completely? +

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

`linear_add_comment` is provided by the Linearapp MCP server (mcp-server-linearapp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Linearapp tool call.

Deterministic rules across all 24 Linearapp tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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