linear_createComment
Add comments to Linear issues to provide updates, ask questions, or reply in threads for better team collaboration.
Instructions
Add a comment to an issue in Linear (supports threaded replies)
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| issueId | Yes | ID or identifier of the issue to comment on (e.g., ABC-123) | |
| body | Yes | Text of the comment (Markdown supported) | |
| parentId | No | ID of the parent comment to reply to (for threaded comments) |
Implementation Reference
- The handler function that implements the core logic for the linear_createComment tool. It performs input validation and calls the Linear service to create the comment./** * Handler for creating a comment */ export function handleCreateComment(linearService: LinearService) { return async (args: unknown) => { try { if (!isCreateCommentArgs(args)) { throw new Error('Invalid arguments for createComment'); } return await linearService.createComment(args); } catch (error) { logError('Error creating comment', error); throw error; } }; }
- The MCP tool definition for linear_createComment, including input and output schemas.export const createCommentToolDefinition: MCPToolDefinition = { name: 'linear_createComment', description: 'Add a comment to an issue in Linear (supports threaded replies)', input_schema: { type: 'object', properties: { issueId: { type: 'string', description: 'ID or identifier of the issue to comment on (e.g., ABC-123)', }, body: { type: 'string', description: 'Text of the comment (Markdown supported)', }, parentId: { type: 'string', description: 'ID of the parent comment to reply to (for threaded comments)', }, }, required: ['issueId', 'body'], }, output_schema: { type: 'object', properties: { id: { type: 'string' }, body: { type: 'string' }, url: { type: 'string' }, parentId: { type: 'string' }, }, }, };
- src/tools/handlers/index.ts:64-126 (registration)The registration of the linear_createComment handler within the tool handlers registry function.export function registerToolHandlers(linearService: LinearService) { return { // User tools linear_getViewer: handleGetViewer(linearService), linear_getOrganization: handleGetOrganization(linearService), linear_getUsers: handleGetUsers(linearService), linear_getLabels: handleGetLabels(linearService), // Team tools linear_getTeams: handleGetTeams(linearService), linear_getWorkflowStates: handleGetWorkflowStates(linearService), // Project tools linear_getProjects: handleGetProjects(linearService), linear_createProject: handleCreateProject(linearService), // Project Management tools linear_updateProject: handleUpdateProject(linearService), linear_addIssueToProject: handleAddIssueToProject(linearService), linear_getProjectIssues: handleGetProjectIssues(linearService), // Cycle Management tools linear_getCycles: handleGetCycles(linearService), linear_getActiveCycle: handleGetActiveCycle(linearService), linear_addIssueToCycle: handleAddIssueToCycle(linearService), // Initiative Management tools linear_getInitiatives: getInitiativesHandler(linearService), linear_getInitiativeById: getInitiativeByIdHandler(linearService), linear_createInitiative: createInitiativeHandler(linearService), linear_updateInitiative: updateInitiativeHandler(linearService), linear_archiveInitiative: archiveInitiativeHandler(linearService), linear_unarchiveInitiative: unarchiveInitiativeHandler(linearService), linear_deleteInitiative: deleteInitiativeHandler(linearService), linear_getInitiativeProjects: getInitiativeProjectsHandler(linearService), linear_addProjectToInitiative: addProjectToInitiativeHandler(linearService), linear_removeProjectFromInitiative: removeProjectFromInitiativeHandler(linearService), // Issue tools linear_getIssues: handleGetIssues(linearService), linear_getIssueById: handleGetIssueById(linearService), linear_searchIssues: handleSearchIssues(linearService), linear_createIssue: handleCreateIssue(linearService), linear_updateIssue: handleUpdateIssue(linearService), linear_createComment: handleCreateComment(linearService), linear_addIssueLabel: handleAddIssueLabel(linearService), linear_removeIssueLabel: handleRemoveIssueLabel(linearService), // New Issue Management tools linear_assignIssue: handleAssignIssue(linearService), linear_subscribeToIssue: handleSubscribeToIssue(linearService), linear_convertIssueToSubtask: handleConvertIssueToSubtask(linearService), linear_createIssueRelation: handleCreateIssueRelation(linearService), linear_archiveIssue: handleArchiveIssue(linearService), linear_setIssuePriority: handleSetIssuePriority(linearService), linear_transferIssue: handleTransferIssue(linearService), linear_duplicateIssue: handleDuplicateIssue(linearService), linear_getIssueHistory: handleGetIssueHistory(linearService), // Comment Management tools linear_getComments: handleGetComments(linearService), }; }
- src/tools/type-guards.ts:184-201 (helper)Type guard function used by the handler to validate input arguments for linear_createComment./** * Type guard for linear_createComment tool arguments */ export function isCreateCommentArgs(args: unknown): args is { issueId: string; body: string; parentId?: string; } { return ( typeof args === 'object' && args !== null && 'issueId' in args && typeof (args as { issueId: string }).issueId === 'string' && 'body' in args && typeof (args as { body: string }).body === 'string' && (!('parentId' in args) || typeof (args as { parentId: string }).parentId === 'string') ); }