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

Annotations already declare readOnlyHint=true, so the safe read nature is covered structurally. The description adds that it returns 'every answer', clarifying the return payload's scope, plus the underlying REST route. It does not mention auth requirements, edit-link behavior, or pagination, which is acceptable for a simple single-fetch.

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 compact sentences with zero filler; the core purpose is front-loaded and the REST endpoint is given as a secondary reference. Nothing is wasted.

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 read-only single-record fetch with no output schema, the description covers the purpose, the lookup key, and the return scope. It lacks only explicit sibling routing and any note on auth or the editLink flag, minor gaps given the fully documented schema.

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% and all three parameters (formId, submissionId, includeEditLink) are fully documented in the schema, so baseline 3 applies. The description adds no parameter-level detail beyond 'by id' and 'every answer', so it does not exceed the schema.

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 (Fetch), resource (a single submission), and lookup key (by id), with 'single' implicitly distinguishing it from the batch siblings like fillout_list_submissions and fillout_export_submissions. It does not name an alternative explicitly, so it stays at 4 rather than 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?

The phrase 'by id' implies you need a known submissionId, which hints at when it applies, but there is no explicit when-to-use or when-not-to-use guidance and no naming of siblings (list/export/count) that an agent should choose between. Usage is inferable but not stated.

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