linear_createComment
Add a comment to an issue in Linear (supports threaded replies)
This record as markdown: /tools/linear/linear-createcomment.md
What linear_createComment does on Linear
AI agents use linear_createComment to create or update resources in Linear, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Linear environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
body | string | — | Text of the comment (Markdown supported) |
issueId | string | — | ID or identifier of the issue to comment on (e.g., ABC-123) |
parentId | string | — | ID of the parent comment to reply to (for threaded comments) |
Parameters from the server's own tool schema.
Why linear_createComment is rated Medium
This tool creates new data (a comment) in a reversible manner. It does not execute arbitrary code, delete data, or move money. However, it could be misused to spam issues, post misleading information, or add comments that derail project communication, warranting medium severity. The confidence is high because the intent is clearly to write/create data.
From the tool's definition Tool performs 'Add a comment' which creates new data (a comment) in the Linear issue tracking system. The description explicitly states it adds/creates content.
Risk signalsAccepts raw HTML/template content (body)
Attacks that exploit this kind of access
The rule that runs linear_createComment safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Linear, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For linear_createComment, this is the rule to start with:
linear_createComment 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Linear, apply this rule, and every linear_createComment call is checked against it from then on.
Questions about linear_createComment
Add a comment to an issue in Linear (supports threaded replies). It is categorised as a Write tool in the Linear MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
linear_createComment accepts 3 parameters: body, issueId, parentId. The full parameter table on this page comes from the server's own tool schema.
Register the Linear MCP server in PolicyLayer and add a rule for linear_createComment: 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 Linear. Nothing to install.
linear_createComment is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the linear_createComment 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.
Set action: deny in the PolicyLayer policy for linear_createComment. 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.
linear_createComment is provided by the Linear MCP server (@linear-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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