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

The description adds substantial behavior beyond the annotations: bounded base64 paging, mandatory SHA-256 verification after reassembly, copy-only safety, and specific failure modes for changed assignments, sources, draft originals, or expired originals. It does not contradict the readOnly, idempotent, or non-destructive annotations.

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?

The description is three sentences with no filler. The first sentence front-loads the verb, resource, and format, and every subsequent sentence adds meaningful operational or safety information.

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?

Despite no output schema and a nested assignmentRevision object, the description covers purpose, encoding, paging, hash verification, and failure conditions. It is missing an explicit connection to how assignmentRevision is obtained and does not mention sibling reader tools, which leaves minor gaps for a tool of this complexity.

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 0% schema coverage, the description compensates by explaining pagination via 'bounded base64 pages', the payload hash via 'verify the full original SHA-256 after reassembly', and assignment freshness via 'current client-file assignment' and 'changed assignments... fail'. However, it does not explicitly define itemId or the outputJobId field within assignmentRevision, leaving those to inference.

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 opens with a specific verb and resource: 'Read actual original bytes for a current client-file assignment', and it clarifies the tool's scope by warning that source excerpts must not be treated as original. It does not explicitly name sibling tools such as read_source_original or read_original_page, so differentiation is implied rather than explicit.

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 description implies usage by targeting a 'current client-file assignment' and warns against treating source excerpts as original, but it never names an alternative tool or states when-not-to-use conditions. 'Only work on a copy' is operational guidance rather than tool-selection guidance.

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