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

Annotations already declare non-read-only, idempotent, non-destructive behavior, so the safety profile is covered. The description usefully adds that the caller must upload the returned archive to R2 with exact headers, which is behavior beyond the annotations, but it says nothing about presign expiry, failure modes, or why idempotency matters.

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 tight sentences, front-loaded with the action and followed by the required follow-up steps. No filler.

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 mutation tool with five undocumented parameters, no output schema, and no annotations about failure modes, the description should explain required inputs and the consequences of the upload step. It conveys the workflow but leaves parameter meaning and error behavior entirely unaddressed.

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% across 5 parameters, so the description carries the full burden and largely fails it. Only vague hints ('ZIP', 'archive') touch on sizeBytes/sha256; projectId, message, and idempotencyKey are never explained.

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?

The description states a specific verb and resource ('Start a presigned ZIP deployment') and implicitly distinguishes itself from finalize_deploy by describing the two-phase flow. It is clear, though 'presigned' deployment terminology assumes the reader already knows the domain.

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?

It gives the operative sequence: start, upload the returned archive to R2 with the exact headers, then finalize. That places the tool clearly in a workflow relative to finalize_deploy, but there are no explicit conditions or exclusions for when this tool should not be used.

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