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

Goes well beyond the read-only/idempotent annotations: it discloses that file references carry only id/name/size with bytes left in customer storage, that withheld or cross-project ids silently read as not-found, and that response content is untrusted respondent input. These are non-obvious behavioral traits an agent could not infer from the schema or 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?

Two dense sentences with no filler; the core fetch purpose, the payload shape, and the security warning are all front-loaded and each clause earns its place.

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?

An output schema exists, so return values need not be spelled out, yet the description still characterizes the payload precisely. With annotations covering the safety profile and the untrusted-content warning covering the injection risk, nothing essential for correct invocation 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 coverage is 100% and the schema already documents the single id parameter and its source. The description adds a little semantic weight via 'accepted response' and the not-found behavior for withheld/cross-project ids, but does not extend the parameter syntax or format.

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 and resource ('Fetch a single accepted response by id') and enumerates the payload (answer data, meta, form version, file references), which separates it from the list-style siblings. It stops short of naming an alternative explicitly, so sibling 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 by 'by id' plus the schema note that the id comes from fillo_list_responses, so the list-then-fetch flow is discoverable. However, the description never says when to prefer this over fillo_response_summary or the list tools, and offers no prerequisites or exclusions.

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