pdf_signer.sign

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

No annotations are provided, so the description carries the full behavioral burden. It usefully discloses the invocation model and preconditions (app-triggered after name entry and consent), but is silent on the consequential facts: that the signature is binding/irreversible and what happens to the document afterward. Meaningful context, but a significant gap remains for a mutation tool.

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?

A single tightly scoped sentence with the core action front-loaded and the qualifier parenthesized. Nothing is wasted, though the brevity is partly under-specification rather than disciplined conciseness.

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?

An output schema exists, so return values need not be described, and the precondition context is supplied. However, with no annotations, four undocumented parameters, and no statement of the document's post-signing state, the definition leaves an agent without enough to safely invoke a legally consequential write.

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 0%, so the description must compensate for all four parameters. It implicitly maps 'typed their full legal name' to typed_name and 'ticked the consent box' to consent, but doc_id and user_id are left entirely unexplained. Half the parameters remain undocumented in both schema and prose.

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 ('Complete the signing ceremony'), which is enough for an agent to know this finalizes a PDF signature. It does not, however, name or differentiate itself from its siblings (pdf_signer.cancel, pdf_request_signature, pdf_signer.get_document), so the agent must infer the boundary.

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 parenthetical gives the precondition state (user typed full legal name, ticked consent), which implies when this fires. But it offers no when-not guidance, no alternatives (e.g. cancel instead of sign), and no indication of whether the agent should ever call it directly versus only observing the app-driven flow.

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