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

Annotations already declare readOnlyHint=true, so the safe-read profile is covered. The description adds useful scope detail ("with every answer," i.e. the full answer set is returned) and the underlying REST mapping, but says nothing about pagination, missing-id behavior, or whether edit links require extra handling beyond the includeEditLink flag.

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 short sentences, front-loaded with the action and resource, with the endpoint mapping appended as a compact reference. Nothing is wasted or buried.

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 a fully described schema and no output schema, the description covers the essentials and notes that all answers come back. It is sufficient to call correctly, though a note on error/not-found behavior would round it out.

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%, so all three parameters are already documented, including formId's connection to fillout_list_forms and includeEditLink's effect. The description adds nothing beyond "by id," so the baseline 3 applies for a schema that does the heavy lifting.

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 gives a specific verb and resource ("Fetch a single submission by id") and signals scope with "single" and "with every answer," which distinguishes it from the sibling list/count/export tools without naming them. It is clear but stops short of explicitly contrasting with fillout_list_submissions or fillout_export_submissions.

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 rather than stated: an agent can infer this is the tool to call when it already has a submissionId and wants that one record. There is no explicit when-not guidance or mention of the sibling alternatives (list, count, export) that an agent might otherwise consider.

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