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

With no annotations, the description carries the full burden and delivers important behavioral context: it requires full data access (paid plan, verification-only excluded) and requires X-API-Key with an argument fallback. It doesn't cover pagination semantics or rate limits, but the auth/plan prerequisites are the material behavioral facts.

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-loaded with purpose, then the parameter rule, then auth requirements — each sentence carries load. The auth sentence is slightly verbose (three clauses) but nothing is wasted.

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 9-parameter tool with no annotations and no output schema, the description covers the returned fields, the exclusivity constraint, and the auth/plan prerequisites. It is essentially complete, though pagination behavior and the missing-output-schema return shape rely entirely on the 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%, so all nine parameters are already documented. The description restates the project/vault exclusivity rule (also encoded in the oneOf) but adds no syntax or semantic detail beyond the schema, so the baseline 3 applies.

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+resource and enumerates the returned aggregates (commit count, lines added/deleted, first/last commit). It clearly distinguishes the two aggregation scopes (project = all vaults vs single vault), letting an agent tell it apart from siblings like get-git-history without opening a 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?

Explicitly states the operating condition 'Provide exactly one of project_id or vault_id' and what each selects, plus the plan prerequisite. It gives clear context for use but never names a sibling alternative (e.g. get-git-history) or a when-not-to-use case.

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