update_pr_branch

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

The description adds context about upstream changes, which is beyond the annotations (idempotentHint=true, readOnlyHint=false). However, it does not explain what happens during the update (e.g., merge vs rebase) or potential side effects like conflicts.

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 efficient sentence, but it could include more useful information without becoming overly verbose. It is missing critical details, making it less effective.

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?

Given the tool has 4 parameters and an output schema, the description is too brief. It omits details about the optional parameter, output behavior, and when to use the tool. The existence of an output schema is not referenced.

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 0%, and the description does not explain any parameters (e.g., the purpose of expected_head_sha). The schema provides types and required flags but no semantic meaning.

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 clearly states the action ('updates'), the resource ('pull request branch'), and what it does ('with latest upstream changes'). This is specific and distinguishes it from siblings like merge_pr or create_pr.

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 is given on when to use this tool versus alternatives like merge_pr or update_reviews. It does not mention prerequisites, scenarios, or exclusions.

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