Record that a time-entry favorite was used, incrementing its use count and updating last-used timestamp.
| Name | Required | Description | Default |
|---|---|---|---|
| favorite_id | Yes | Id of the favorite to record usage for. | |
| idempotency_key | No | Optional caller-supplied key; retrying with the same key returns the original result instead of acting twice. |
Changes observed during successful MCP inspections.
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations provided, so description bears full burden. It states incrementing count and updating timestamp but omits side effects, authorization needs, rate limits, or the idempotency mechanism described in the schema.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Single sentence, 15 words, directly conveys the action. No filler, front-loaded with key information.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a 2-param tool with no output schema, coverage is moderate. Covers basic action but lacks usage context and behavioral details that are not already in schema.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100% (both favorite_id and idempotency_key described). Description adds no extra meaning beyond schema; baseline 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
Description clearly states verb (record), resource (time-entry favorite), and actions (incrementing use count, updating timestamp). This distinguishes it from sibling tools like create_favorite, delete_favorite, and list_favorites.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No guidance on when to use this tool vs alternatives. Does not mention when not to use, nor provides context on prerequisites, idempotency behavior, or relationships to other favorite-related tools.
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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