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

Annotations already disclose read-only, idempotent, non-destructive behavior. The description adds a useful dynamic cue with 'current', telling agents that the returned status is the latest state and may change between calls. No contradiction with annotations was found.

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?

The description is a single, front-loaded sentence that names the action, target, and differentiating factor without any filler. It earns its place entirely.

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 one-parameter, read-only getter with robust annotations, the description is nearly complete: the agent can infer that invoking get_call with a valid call_id returns status and details. It omits edge-case behavior such as handling of unknown call_ids, but that is a minor gap for such a simple tool.

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%: the schema already documents call_id as the identifier from place_call or list_calls. The description only repeats 'by id' and does not add meaning beyond the schema, so the baseline score of 3 is appropriate.

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 states a specific verb ('Get'), a specific resource ('a single call'), and a clear dimension ('current status and details'). It distinguishes itself from sibling tools like list_calls (which retrieves multiple calls) and place_call/hangup_call (which act on calls rather than merely read them).

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 description implies the usage context — use this when you need details for a specific call by id — but it does not explicitly address when to prefer a sibling tool such as list_calls. The schema's note that call_id comes from place_call or list_calls provides some provenance, but no direct when-to-use or when-not-to-use guidance is given.

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