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

readOnlyHint=true already tells the agent this is a safe read, so the description must add something beyond that — but it adds nothing about return shape, missing-id behavior, or whether recording data is included. The phrase 'one call record' only restates the name/title at a slightly finer grain.

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?

A single front-loaded sentence with zero padding. Brevity is appropriate for a simple getter, though it borders on under-specification rather than tightness.

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?

With no output schema and one of two parameters undocumented, the description leaves real gaps: what fields a call record contains and what includeRecordingUrl changes. Annotations cover safety only, so for a tool whose output shape is unknown the description should say more.

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 50%: `id` is documented in the schema, but `includeRecordingUrl` has no description anywhere. The description says 'by call id' but adds no format details, and it silently omits the optional recording-URL flag, which is exactly the kind of behavioral choice a caller needs explained.

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 ('Get one call record by call id'), which clearly separates it from spokephone_list_calls (many) and spokephone_get_call_recording (a sub-resource). It doesn't explicitly name those siblings, but the singular 'one call record' plus the id-based lookup makes the distinction inferable.

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?

No guidance on when to use this versus spokephone_list_calls or spokephone_get_call_recording, and no mention of prerequisites, error cases (unknown id), or what happens after a call is deleted. The agent must infer usage entirely from the name and description.

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