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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds a useful trust caveat (local working copies are not independently checked or finally approved; works while production is gated), which is real context beyond the annotations. However the caveat is dense and does not clarify pagination termination or the relationship between handoff state and approval.

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 and reasonably short, with the read scope stated first. Some sentences are cryptic and carry opaque jargon ('managed binary production is gated') that costs more parsing effort than it repays, so it is adequate but not tight.

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?

It does enumerate the returned fields, partly compensating for the absent output schema, and it flags the gated-production condition. But for a 5-parameter tool with a nested required object and only 20% schema coverage, the missing parameter documentation and the ambiguous state/approval semantics leave meaningful gaps.

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 only 20%, with just projectId documented, so the description must carry the remaining four parameters. It hints at 'revision' (expectedRevision) and 'nextOffset' (offset), but says nothing about documentId, the maxFields cap of 10, or the structure/format of the nested expectedRevision object (outputJobId, payloadHash). Too little to compensate for the coverage gap.

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 ('Read') and resource (a bounded inventory of fields to fill in a buyer original), plus enumerates what the payload contains (revision, evidence, missing values, approval state). It also explicitly distinguishes itself from the sibling read_filling_field, which is the actual value lookup. The jargon ('real buyer original', 'managed binary production') keeps it from being a clean 5.

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 a concrete continuation rule ('Continue nextOffset') and routes the agent to the alternative tool for per-value reads ('Use read_filling_field for each actual value'), plus a prohibition ('Never reconstruct an original from source excerpts'). Context is clear, though there is no explicit statement of when NOT to use this tool or what prerequisites gate it.

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