Codex Implement

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

With no annotations provided, the description carries the behavioral disclosure burden. It does state the WARNING that this modifies the codebase and mentions it returns a summary of changes. However, it doesn't disclose execution time, serialization behavior with threadKey, or whether changes are reversible/committed.

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?

Three short sentences with the critical warning front-loaded in the middle. Zero waste, effectively communicates danger and return value. Could arguably be more compact, but the structure is clean and scannable.

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?

For a mutation tool with no annotations and no output schema, the description is somewhat thin. It warns about codebase modification and mentions the summary return, but a more complete description would note that changes should be reviewed/verified, might persist in working tree, and that this is an expensive/long-running operation relative to siblings.

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 75% (3 of 4 params described in schema). The description adds minimal parameter meaning beyond schema, though the model param's 'omission' guidance IS in the schema itself. The description does not add details about workingDirectory semantics or task format beyond what schema provides. Baseline 3 is appropriate given high schema coverage.

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 tool's function: 'implement a feature, fix a bug, or make code changes' via Codex. The verb+resource is specific ('Ask Codex to implement'). However, it doesn't explicitly distinguish this from siblings like codex_query or codex_review_code, though the code-modifying nature is implied.

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 it's for implementation/code-changing tasks and explicitly warns 'This modifies your codebase,' which signals it's not appropriate for read-only inquiries. However, it doesn't explicitly name alternatives for read-only tasks (like codex_query for Q&A or codex_review_code for review) or provide when-not-to-use guidance.

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