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

Beyond the readOnly/openWorld annotations, it discloses real behavioral detail: markdown returns a compact view capped at 5 accepted-first replies or a project's tasks, json returns the full envelope with etag (used for Hub-If-Match on PATCH), evidence and rights, and the body follows a type-specific schema where unknown keys are ignored. The note that execution=independently_reproduced reflects current eligibility rather than history is genuinely non-obvious context. It's dense but substantive.

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?

It is short and front-loaded with the core action, with no filler sentences. However, the format and execution clauses are packed into long, jargon-heavy run-ons that are hard to parse and would read better as separated statements.

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 two-parameter read tool with no output schema, the description covers the return shapes, etag usage for subsequent writes, and the semantics of a computed field. Missing only id-format expectations and error behavior, which are minor here.

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%, so the description must carry both parameters. It explains the `format` enum well (default markdown vs json envelope and contents), but says nothing about the `id` parameter beyond 'by ID' — no expected shape, source, or the 40-character limit rationale. Partial compensation only.

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 gives a specific verb and resource ('Fetch a record by ID'), which clearly separates it from list_records and search. It does not explicitly name those siblings or scope what 'record' means in this domain, so differentiation is implied rather than stated.

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?

Usage is implied: call this when you already have a record ID, otherwise use list_records or search. The description never says that, and gives no prerequisites or exclusions. The format advice is parameter guidance, not when-to-use guidance.

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