linear_addIssueLabel

Add a label to an issue in Linear to organize and categorize project tasks for better tracking and management.

Instructions

Add a label to an issue in Linear

Input Schema

TableJSON Schema

Name	Required	Description	Default
`issueId`	Yes	ID or identifier of the issue to add the label to (e.g., ABC-123)
`labelId`	Yes	ID of the label to add to the issue

Implementation Reference

src/tools/handlers/issue-handlers.ts:139-152 (handler)

The main handler function that implements the linear_addIssueLabel tool. It validates input using isAddIssueLabelArgs and calls linearService.addIssueLabel to add the label to the issue.

export function handleAddIssueLabel(linearService: LinearService) {
  return async (args: unknown) => {
    try {
      if (!isAddIssueLabelArgs(args)) {
        throw new Error('Invalid arguments for addIssueLabel');
      }

      return await linearService.addIssueLabel(args.issueId, args.labelId);
    } catch (error) {
      logError('Error adding label to issue', error);
      throw error;
    }
  };
}

src/tools/definitions/issue-tools.ts:403-428 (schema)

The schema definition for the linear_addIssueLabel tool, including input and output schemas.

export const addIssueLabelToolDefinition: MCPToolDefinition = {
  name: 'linear_addIssueLabel',
  description: 'Add a label to an issue in Linear',
  input_schema: {
    type: 'object',
    properties: {
      issueId: {
        type: 'string',
        description: 'ID or identifier of the issue to add the label to (e.g., ABC-123)',
      },
      labelId: {
        type: 'string',
        description: 'ID of the label to add to the issue',
      },
    },
    required: ['issueId', 'labelId'],
  },
  output_schema: {
    type: 'object',
    properties: {
      success: { type: 'boolean' },
      issueId: { type: 'string' },
      labelId: { type: 'string' },
    },
  },
};

src/tools/handlers/index.ts:109-109 (registration)
Registration of the linear_addIssueLabel tool handler in the registerToolHandlers function.
```
linear_addIssueLabel: handleAddIssueLabel(linearService),
```

src/tools/type-guards.ts:226-238 (schema)

Type guard function for validating input arguments to the linear_addIssueLabel tool.

export function isAddIssueLabelArgs(args: unknown): args is {
  issueId: string;
  labelId: string;
} {
  return (
    typeof args === 'object' &&
    args !== null &&
    'issueId' in args &&
    typeof (args as { issueId: string }).issueId === 'string' &&
    'labelId' in args &&
    typeof (args as { labelId: string }).labelId === 'string'
  );
}

Linear