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bear_add_tag

Add a tag to a Bear note, including hierarchical tags like 'parent/child', making the note discoverable under both #parent and #parent/child.

Instructions

Add a tag to an existing Bear note. The tag is inserted into the note's markdown. Hierarchical tags like 'parent/child' also index every ancestor — so the note becomes discoverable under both #parent and #parent/child in Bear's sidebar.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYesNote ID (uniqueIdentifier)
tagYesTag to add (without #)

Implementation Reference

  • Tool definition and schema for bear_add_tag. Defines the tool name, description, inputSchema (id and tag fields), and buildArgs that construct the CLI command ['tag', 'add', id, tag, '--json'].
    bear_add_tag: {
      tool: {
        name: "bear_add_tag",
        description:
          "Add a tag to an existing Bear note. The tag is inserted into the note's markdown. Hierarchical tags like 'parent/child' also index every ancestor — so the note becomes discoverable under both #parent and #parent/child in Bear's sidebar.",
        inputSchema: {
          type: "object" as const,
          properties: {
            id: {
              type: "string",
              description: "Note ID (uniqueIdentifier)",
            },
            tag: {
              type: "string",
              description: "Tag to add (without #)",
            },
          },
          required: ["id", "tag"],
        },
        annotations: {
          readOnlyHint: false,
          destructiveHint: false,
          idempotentHint: false,
        },
      },
      buildArgs: (input) => [
        "tag",
        "add",
        String(input.id),
        String(input.tag),
        "--json",
      ],
    },
  • Registration via ListToolsRequestSchema handler. On L29-31, all tool definitions (including bear_add_tag) are exported from ./tools.js and registered by listing them via the MCP SDK's ListToolsRequestSchema.
    server.setRequestHandler(ListToolsRequestSchema, async () => ({
      tools: Object.values(tools).map((t) => t.tool),
    }));
  • Execution handler for all tools (CallToolRequestSchema). On L33-42, the handler looks up the tool by name in the `tools` registry — when 'bear_add_tag' is called, it retrieves the ToolHandler and executes buildArgs(params) to construct the bcli command.
    server.setRequestHandler(CallToolRequestSchema, async (request) => {
      const { name, arguments: input } = request.params;
      const handler = tools[name];
    
      if (!handler) {
        return {
          content: [{ type: "text", text: `Unknown tool: ${name}` }],
          isError: true,
        };
      }
Behavior4/5

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

Beyond annotations (readOnlyHint=false, destructiveHint=false), the description adds behavioral context by explaining hierarchical tag indexing and insertion into markdown, which helps the agent understand side effects.

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?

Three sentences with no wasted words; the first sentence immediately conveys the core purpose, and subsequent sentences add necessary detail efficiently.

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

Completeness4/5

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

For a simple mutation tool with no output schema, the description covers the core action and an important nuance (hierarchical tags), though it omits return value details or preconditions like note existence.

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

Parameters4/5

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

While schema coverage is 100%, the description adds value by clarifying how hierarchical tags work (indexing ancestors), enhancing understanding of the 'tag' parameter beyond the schema's brief description.

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

Purpose5/5

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

The description clearly states the tool adds a tag to a Bear note, specifies it inserts into markdown, and explains hierarchical behavior, distinguishing it from sibling tools like bear_delete_tag or bear_remove_tag.

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

Usage Guidelines3/5

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

The description does not explicitly state when to use this tool versus alternatives such as bear_edit_note or other tag tools, leaving it to the agent to infer that this is the appropriate action for adding a tag without removing existing ones.

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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