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create_comments

Add comments to Todoist tasks or projects to provide context, notes, or additional information using markdown formatting.

Instructions

Create new comments in Todoist

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
itemsYes

Implementation Reference

  • Registration of the 'create_comments' tool, including schema for input parameters (task_id, project_id, content) and configuration for batch POST to Todoist /comments endpoint.
    createBatchApiHandler({
        name: 'create_comments',
        description: 'Create new comments in Todoist',
        itemSchema: {
            task_id: z.string().optional(),
            project_id: z.string().optional(),
            content: z.string().describe('Markdown-formatted text and hyperlinks'),
            // attachment: z.object({}).optional(),
        },
        method: 'POST',
        path: '/comments',
        mode: 'create',
    });
  • Zod schema definition for individual comment creation items in batch mode.
    itemSchema: {
        task_id: z.string().optional(),
        project_id: z.string().optional(),
        content: z.string().describe('Markdown-formatted text and hyperlinks'),
        // attachment: z.object({}).optional(),
    },
  • Generic handler factory that creates the MCP tool callback for 'create_comments'. For 'create' mode, it processes batch items and calls todoistApi.post('/comments', apiParams) to create comments.
    export function createBatchApiHandler<T extends z.ZodRawShape>(
        options: {
            name: string;
            description: string;
            itemSchema: T;
            method: HttpMethod;
            mode?: 'read' | 'create' | 'update' | 'delete';
            idField?: string;
            nameField?: string;
            findByName?: (name: string, items: any[]) => any | undefined;
            validateItem?: (item: any) => { valid: boolean; error?: string };
        } & ( // Or we specify full path
            | {
                  path: string;
                  basePath?: never;
                  pathSuffix?: never;
              }
            // Or we specify base path and path suffix
            | {
                  path?: never;
                  basePath: string;
                  pathSuffix: string;
              }
        )
    ) {
        // Create basic description, we cant properly use 'anyOf' here so for now we will add info to description
        let finalDescription = options.description;
        const requiresIdOrName = options.idField && options.nameField && options.mode !== 'create';
    
        if (requiresIdOrName) {
            const requirementText = `\nEither '${options.idField}' or the '${options.nameField}' to identify the target.`;
            finalDescription += requirementText;
        }
    
        const itemSchemaObject = z.object(options.itemSchema);
    
        const enhancedItemSchema: z.ZodTypeAny = requiresIdOrName
            ? itemSchemaObject.refine(
                  (data: any) =>
                      data[options.idField!] !== undefined || data[options.nameField!] !== undefined,
                  {
                      message: `Either ${options.idField} or ${options.nameField} must be provided`,
                      path: [options.idField!, options.nameField!],
                  }
              )
            : itemSchemaObject;
    
        const batchSchema = z.object({
            items: z.array(enhancedItemSchema),
        });
    
        const handler = async (args: z.infer<typeof batchSchema>): Promise<any> => {
            const { items } = args;
    
            // For modes other than create, check if name lookup is needed
            let allItems: any[] = [];
    
            const needsNameLookup =
                options.mode !== 'create' &&
                options.nameField &&
                options.findByName &&
                items.some(item => item[options.nameField!] && !item[options.idField!]);
    
            if (needsNameLookup) {
                // Determine the base path for fetching all items
                // Example: /tasks from /tasks/{id}
                const lookupPath =
                    options.basePath || (options.path ? options.path.split('/{')[0] : '');
                allItems = await todoistApi.get(lookupPath, {});
            }
    
            const results = await Promise.all(
                items.map(async item => {
                    if (options.validateItem) {
                        const validation = options.validateItem(item);
    
                        if (!validation.valid) {
                            return {
                                success: false,
                                error: validation.error || 'Validation failed',
                                item,
                            };
                        }
                    }
    
                    try {
                        let finalPath = '';
                        const apiParams = { ...item };
    
                        // For modes where need id
                        if (options.mode !== 'create' && options.idField) {
                            let itemId = item[options.idField];
                            let matchedName = null;
                            let matchedContent = null;
    
                            // If no ID but name is provided, search by name
                            if (!itemId && item[options.nameField!] && options.findByName) {
                                const searchName = item[options.nameField!];
                                const matchedItem = options.findByName(searchName, allItems);
    
                                if (!matchedItem) {
                                    return {
                                        success: false,
                                        error: `Item not found with name: ${searchName}`,
                                        item,
                                    };
                                }
    
                                itemId = matchedItem.id;
                                matchedName = searchName;
                                matchedContent = matchedItem.content;
                            }
    
                            if (!itemId) {
                                return {
                                    success: false,
                                    error: `Either ${options.idField} or ${options.nameField} must be provided`,
                                    item,
                                };
                            }
    
                            // Apply security validation to itemId before using in path
                            const safeItemId = validatePathParameter(itemId, options.idField || 'id');
    
                            if (options.basePath && options.pathSuffix) {
                                finalPath = `${options.basePath}${options.pathSuffix.replace('{id}', safeItemId)}`;
                            } else if (options.path) {
                                finalPath = options.path.replace('{id}', safeItemId);
                            }
    
                            delete apiParams[options.idField];
                            if (options.nameField) {
                                delete apiParams[options.nameField];
                            }
    
                            let result;
                            switch (options.method) {
                                case 'GET':
                                    result = await todoistApi.get(finalPath, apiParams);
                                    break;
                                case 'POST':
                                    result = await todoistApi.post(finalPath, apiParams);
                                    break;
                                case 'DELETE':
                                    result = await todoistApi.delete(finalPath);
                                    break;
                            }
    
                            const response: any = {
                                success: true,
                                id: itemId,
                                result,
                            };
    
                            if (matchedName) {
                                response.found_by_name = matchedName;
                                response.matched_content = matchedContent;
                            }
    
                            return response;
                        }
                        // Create mode
                        else {
                            finalPath = options.path || options.basePath || '';
    
                            let result;
                            switch (options.method) {
                                case 'GET':
                                    result = await todoistApi.get(finalPath, apiParams);
                                    break;
                                case 'POST':
                                    result = await todoistApi.post(finalPath, apiParams);
                                    break;
                                case 'DELETE':
                                    result = await todoistApi.delete(finalPath);
                                    break;
                            }
    
                            return {
                                success: true,
                                created_item: result,
                            };
                        }
                    } catch (error) {
                        return {
                            success: false,
                            error: error instanceof Error ? error.message : String(error),
                            item,
                        };
                    }
                })
            );
    
            const successCount = results.filter(r => r.success).length;
            return {
                success: successCount === items.length,
                summary: {
                    total: items.length,
                    succeeded: successCount,
                    failed: items.length - successCount,
                },
                results,
            };
        };
    
        return createHandler(options.name, finalDescription, batchSchema.shape, handler);
    }
  • Utility function that registers the tool with the MCP server using server.tool, wrapping the handler logic with error handling.
    export function createHandler<T extends z.ZodRawShape>(
        name: string,
        description: string,
        paramsSchema: T,
        handler: (args: HandlerArgs<T>) => Promise<any>
    ): void {
        const mcpToolCallback = async (args: HandlerArgs<T>): Promise<CallToolResult> => {
            try {
                const result = await handler(args);
    
                return {
                    content: [
                        {
                            type: 'text',
                            text: JSON.stringify(result ?? null, null, 2).trim(),
                        },
                    ],
                };
            } catch (error) {
                const errorMessage = error instanceof Error ? error.message : String(error);
    
                console.error(`Error in tool ${name}:`, error);
    
                return {
                    isError: true,
                    content: [
                        {
                            type: 'text',
                            text: `Error executing tool '${name}': ${errorMessage}`,
                        },
                    ],
                };
            }
        };
    
        // Crazy cast, if you can do it better, please, let me knows
        server.tool(name, description, paramsSchema, mcpToolCallback as unknown as ToolCallback<T>);
    }
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. While 'Create new comments' implies a write operation, the description doesn't address important behavioral aspects: whether this requires specific permissions, what happens when creating multiple comments, whether there are rate limits, what the response format looks like, or how errors are handled. For a mutation tool with zero annotation coverage, this is insufficient.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is maximally concise - a single sentence with no wasted words. It's front-loaded with the essential action and target system. Every word earns its place, though this conciseness comes at the expense of completeness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given this is a mutation tool with no annotations, no output schema, and complex nested parameters (items array with objects), the description is severely incomplete. It doesn't address the behavioral implications of creating comments, doesn't explain the parameter structure, and provides no context about the Todoist comment system. For a tool that creates data in a task management system, this leaves too many unknowns for effective agent use.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has 0% description coverage, so the description must compensate but provides no parameter information. The schema shows a complex 'items' array with nested objects containing 'task_id', 'project_id', and 'content' fields, but the description doesn't explain what these mean, their relationships, or usage patterns. The description adds zero value beyond what's visible in the bare schema structure.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Create new comments') and the target system ('in Todoist'), which provides a specific verb+resource combination. However, it doesn't distinguish this tool from its sibling 'update_comments' or explain how it differs from 'get_comments' - it only establishes basic purpose without sibling differentiation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance about when to use this tool versus alternatives like 'update_comments' or 'delete_comments'. There's no mention of prerequisites, appropriate contexts, or when this tool should be preferred over other comment-related operations. The agent receives no usage direction beyond the basic purpose statement.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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