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

The description openly says 'MUTATES by removing' and describes side effects, but annotations mark destructiveHint=false and idempotentHint=true. Removing a row and returning an error for an unknown/other-user ID contradicts both annotations, so this is an annotation contradiction.

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?

Compact and front-loaded; most clauses carry decision-relevant information. The parenthetical '($0.10; API key required)' partly duplicates the earlier auth sentence and adds ambiguity, preventing a perfect score.

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 one-parameter mutating tool with an output schema present, the description covers side effects, error behavior, auth, cost, and sibling routing. The annotation contradiction and the auth wording inconsistency keep it from being fully complete.

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 coverage is 100% for the single parameter. The description reinforces that food_id is required and adds behavior beyond the schema: unknown or other-user food_id returns an error, and the row must be owned by the authenticated user.

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?

States a spsecific verb ('removing') and resource ('one Food Diary row ... and its mirrored calendar event'), and explicitly distinguiishes it from deete_event for meals logged via log_food. Ownership and error conditions are also clear.

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?

Gives direct routing guidance: prefer this over delete_event for meals logged via log_food. Auth constraints are stated, but the text is internally inconsistent: it says 'API key or OAuth with scope context' yet ends with 'API key required'.

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