fork_join

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

With no annotations provided, the description carries full responsibility for disclosing behavior. It clearly states error conditions ('Errors if the fork is unknown or already closed') and explains the purpose of registration. It does not detail side effects or idempotency, but the provided error behavior adds useful context beyond a simple statement.

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 tightly written sentences provide the core action, a parameter definition, a usage hint, and an error condition. No unnecessary words or repetition; the structure is clean and front-loaded.

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?

The description is adequate for a low-complexity registration tool with three simple parameters. It includes error handling and refers to a related tool (fork_log) for the next step. It does not describe return values, but that is acceptable given the absence of an output schema and the straightforward nature of the operation.

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?

The schema does not describe the parameters at all (0% coverage). The description gives meaning to 'component' (an agent, repo, or subsystem name) and implies that 'fork_id' refers to the fork being joined, but does not clarify 'app_id'. Thus it partially compensates for the schema gap but not fully.

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 uses a specific verb ('Register') and identifies the resource (component as a participant in an open fork). It distinctly sets this apart from sibling tools like fork_create, fork_log, and fork_status, making the tool's purpose unambiguous.

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 when to use the tool by explicitly mentioning the next step ('so its changes can then be logged against the fork via fork_log') and listing prerequisite conditions ('open fork'). However, it does not explicitly state alternatives or when not to use it, which would merit a 5.

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