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

Annotations already establish this is a non-read-only, non-destructive, non-idempotent write, so the safety bar is partly met structurally. The description adds chunk-size and sequencing behavior, but says nothing about persistence, retention of uploaded chunks, or auth needs, and the phantom 'complete=true' flag conflicts with the actual schema.

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 tight sentences, front-loaded with purpose and immediately followed by the size guidance and the workflow ordering. Every sentence carries information, with only a minor deduction for the misleading 'complete=true' token.

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 multi-step chunked upload with no output schema, the description supplies the chunk strategy, size range, and the required follow-up call, which is most of what an agent needs. It omits error handling and what upload_id looks like on return, but is otherwise solid.

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%, so the baseline is 3, but the description adds genuinely non-schema semantics: the 4000–8000 character guidance for chunk_base64 and the note that upload_id is used to chain into anonymize_document. That is real meaning beyond what the schema documents.

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 (send) and resource (a Claude/Cowork file as base64 chunks) and clearly differentiates itself from siblings by naming the anonymize_document follow-up. The odd reference to 'complete=true' — a parameter that does not exist in the schema — slightly muddies the mechanism.

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 concrete operational guidance ('prefer 4000–8000 characters per chunk'), specifies the sequencing ('After complete=true, call anonymize_document with...'), and adds a prohibition ('Do not extract spreadsheet or document text'). This gives the agent both the next step and a boundary, though it doesn't cover failure/retry conditions.

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