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

With readOnlyHint/idempotentHint/non-destructive already declared, the description still adds real value: timestamps are UTC, ids/status/mode are internal, and '"active" means still running' clarifies a term that would otherwise be ambiguous. It stops short of describing error behavior for an unknown sessionId.

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 with the return contents, then the alternative routing, then the semantic clarifications. The bilingual example queries are slightly unusual but serve a selection purpose; no sentence is filler.

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, annotations cover the safety profile, and the parameter is documented, so the description only needs to add selection and behavioral context — which it does. Minor gap: nothing about failure modes or how 'last activity' relates to the transcript.

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 the single sessionId parameter is already documented with its UUID pattern and provenance (list_recordings/search_recordings). The description adds nothing about the parameter, so baseline 3 applies.

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 ('Returns one recording's...') and enumerates the exact fields returned (title, start time, duration, participant count, last activity/segment, word/audio-file counts). It also names the sibling it is not (get_transcript), so an agent can distinguish it without opening the schema.

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?

Explicitly routes the agent to get_transcript 'for what was said', and the example user questions ('how long was that call', 'wie viele Teilnehmer waren dabei') show the query shapes this tool answers. It doesn't state prerequisites or other exclusions, but the primary alternative is covered.

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