cache_presign_url

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

No annotations provided, so description must fully inform behavior. It mentions short-lived and signed (HMAC) but omits important details like required permissions, rate limits, whether the operation is safe (read-only), or error cases. The description fails to disclose behavioral traits that the agent needs to know.

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?

The description is a single concise sentence that communicates the core purpose. It is front-loaded, but lacks any structural elements like bullet points or separate sections that could improve readability for an AI agent.

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?

With no output schema and no annotations, the description is incomplete. It does not explain what the returned URL looks like, how to use it, or details on lifetime and security. For a tool that generates a presigned URL, essential context 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 50% (only path has a description). Description adds 'short-lived' which loosely relates to expire_seconds but does not explain its syntax or behavior. It provides minimal added meaning beyond the schema, failing to compensate for the low coverage.

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 the tool creates a short-lived signed local_uri for a cache file using HMAC, with the purpose of verifying cache access. The verb 'Create' and resource 'local_uri for a cache file' are specific, and it distinguishes itself from sibling tools like cache_list or cache_write_text.

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?

The description implies usage for verifying cache access but does not explicitly state when to use this tool over alternatives, nor does it provide exclusions or prerequisites. Guidance is minimal.

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