Get call activity

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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is fully covered. The description adds nothing beyond that: it does not say what happens when the ID does not exist, whether it errors or returns empty, or what kind of record comes back. For a lookup tool with no output schema, that is a real gap.

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 core action and then the parameter. The first sentence 'Get call activity' largely restates the title and name, so it is mildly redundant, but nothing is padded 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?

This is a low-complexity single-record getter with rich annotations and a fully documented one-parameter schema, so little is strictly required. Still, it omits the not-found/miss behavior and gives no hint of what a call activity record contains, which would help an agent decide between this and the list endpoints.

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?

With a single required parameter and 100% schema description coverage, the schema already defines callActivityId including its UUID format and pattern. The description merely repeats the parameter name in backticks without adding format, sourcing, or lookup guidance, so it meets but does not exceed the baseline.

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 ('Retrieves') and resource ('a single call activity'), and the word 'single' implicitly separates it from the sibling list_call_activities. It stops short of naming that sibling explicitly, so an agent must infer the distinction from the shared vocabulary.

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?

There is no when-to-use guidance, no mention of when not to use it, and no reference to alternatives such as list_call_activities or list_call_activity_feed. The agent is left to infer that this is the detail-fetch companion to the list tools.

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