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

Beyond the readOnly/idempotent annotations, the description discloses concrete limits (10 MB base64, 2,000 revisions/comments, fields truncated at 20,000 chars), failure handling (unsafe/over-limit files refused but not charged), latency (~2 s), pricing (USD 0.005, no free tier), and an untrusted-content warning. That is exactly the operational context annotations cannot carry.

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?

Front-loaded with purpose and outputs before constraints and pricing, with essentially no filler. It is dense but every clause carries information; the only cost is that the limits/pricing sentence is packed tightly.

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?

Although an output schema exists, the description still orients the agent to the return structure and adds coverage limits, edge cases, and cost behavior. For a paid, file-processing tool, nothing an agent needs to decide and invoke correctly 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 description coverage is 100%, so the baseline is 3. The description restates that `include_text` adds accepted/rejected body text only and that `file_base64` is one DOCX, but it does not add syntax or format detail beyond the schema entries.

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 opening sentence names a specific verb (list) and precise resources (DOCX insertions, deletions, moves, formatting changes, comments), and the output keys `revisions` and `comments` further pin down what is returned. An agent can easily distinguish this from pdf_inspect, extract_pdf, or convert_document_to_markdown because the scope is explicitly tracked changes in a DOCX.

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 clear operational context: one DOCX as base64, optional include_text, coverage of body/headers/footers/footnotes/endnotes, and explicit exclusions (text boxes not covered, comment anchors body-only). It does not name a sibling alternative or spell out when-not-to-use conditions beyond scope limits, which keeps it out of the top band.

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