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

With no annotations, the description carries the full burden and does disclose two meaningful traits: the destructive cascade to vaults and the authentication requirement/fallback. It omits irreversibility, required permission level, and failure behavior on partially-populated projects, which matter for a delete operation.

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?

Two short sentences, front-loaded with the destructive action and scope, followed by auth mechanics with no filler. The parenthetical about generating a key in the web app is marginally verbose but still useful to an agent that lacks credentials.

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 an unannotated destructive tool with no output schema, the description covers the essential blast radius and auth needs but leaves irreversibility, permission requirements, and error/edge behavior unspecified. Adequate to call correctly, thin on consequences.

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% and both parameters are documented there, so the baseline is 3. The description's mention of api_key as a header fallback restates the schema description rather than adding format or precedence details beyond it.

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 ('Deletes a project') and adds the cascade scope ('and its vaults'), which immediately separates it from delete-code-vault and delete_account. It stops short of explicitly naming an alternative or confirming whether nested vault data is fully purged, so it is clear but not sibling-aware.

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?

Provides a conditional usage instruction for the api_key argument when headers cannot be set, plus where to obtain a key, which is genuinely actionable context. It gives no guidance on when deletion is appropriate versus archiving or when-not-to-use, so usage remains implied rather than explicit.

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