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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=false, so the safety profile is covered by structured data. The description adds only that the target must be an existing recording; it says nothing about what happens when the id is unknown, whether the old title is recoverable, or any side effects.

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; the action statement comes first and the usage trigger follows. No filler or restatement of the tool name.

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 an output schema present, a fully documented two-parameter schema, and complete annotations, the description covers what an agent needs to select and call it. The only meaningful omission is error behavior for an invalid or non-existent recording id.

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%, so both parameters (id, title) including the 1-255 length constraint are already documented in the schema. The description mentions only the title concept generically and adds no format, sourcing, or validation detail beyond it — 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 ('changes the title of an existing recording') and adds the auto-titled-upload use case, which pins down the intent. It is trivially distinguishable from siblings like delete_transcript, retranscribe_transcript, or export_transcript.

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 says when to call it: 'when the user wants to rename a recording or give an auto-titled upload a meaningful name.' It does not name a when-not condition or a competing sibling, but no sibling plausibly competes for this action.

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