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

Annotations declare destructiveHint=true and idempotentHint=false, and the description usefully explains the destructive mechanic ("Calling it again replaces the notes") plus translation defaults, the 1500-character limit, and that summarize returns the English it used. It does not mention auth requirements or failure modes, but the added behavioral context is substantial.

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?

Front-loads the core action and is dense with no filler, though several clauses are run together into long sentences (the notes/translation sentence in particular) which slightly hurts scannability. Size is justified by the number of behaviors being disclosed.

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 6-parameter tool with a nested object and no output schema, the description covers the overwrite semantics, translation behavior, character limits, and what summarize returns. It leaves permission requirements and error behavior unstated, but nothing critical to correct invocation is missing.

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%, so baseline is 3, but the description adds real meaning beyond the schema: per-language notes are used as written, untranslated languages fall back to English on submit, and the 1500 vs 20000 character split maps to the summarize flag. This is more than restating field descriptions.

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 specific verb and resource ("Saves the 'What's new' notes on the update") and situates itself in a workflow ("Step 3"), which separates it from start_update and submit_update. An agent can tell what it writes and where without opening the schema.

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 clear conditional guidance: use summarize true for long notes like a GitHub release or changelog section, use translate false to skip translation, and "Then call submit_update" establishes sequencing. It stops short of an explicit when-not-to-use or naming an alternative sibling, so it is strong context rather than full routing.

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