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

Annotations cover the safety profile (readOnlyHint, openWorldHint), and the description adds genuinely new behavioral context beyond them: the push-triggered deploy model, the correct call sequence after code_write_files, and the state/target semantics that determine prod_url. It leaves one gap: the annotations declare destructiveHint=true while the operation reads as a pure query, and the description does nothing to explain that discrepancy.

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?

Three short sentences, each earning its place: what is returned, when to call it, and how to interpret the result. The core verb and resource are front-loaded.

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?

No output schema exists, so the description must carry the return shape, and it does summarize it (state, url, target, prod_url). It is nearly complete for a one-parameter read tool, though it omits whether polling/retry is expected while a build is pending.

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?

With a single parameter and 100% schema description coverage, the schema already carries the meaning of site_id. The description adds no format, id-source, or lookup guidance beyond it, 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 and resource ("Get the latest Vercel deployment for a code site") and even names the returned fields (state, url, target), so an agent can distinguish it from siblings like code_status, code_build_logs, or code_write_files.

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 triggering context: "Deploys are push-triggered, so call this after code_write_files to watch the build." It does not, however, name an alternative (e.g. code_build_logs for logs) or state when not to use it, so it stops short of the explicit when/when-not/alternatives bar.

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