Codex Code Review

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

With no annotations, the description carries the full burden. It states that the tool invokes Codex and 'Returns specific, actionable feedback', which covers the primary behavior and output. However, it does not mention side effects, whether the tool modifies files, prerequisites like a git repository, or external-service considerations, leaving some behavioral ambiguity.

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 two tight sentences with the core purpose front-loaded and input options compressed efficiently. Every phrase earns its place and there is no fluff or repetition.

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 no annotations and no output schema, the description plus schema covers the target formats, optional context, focus areas, thread continuation, and the return type at a high level. The main gap is the undocumented workingDirectory parameter, though its meaning is reasonably inferable from its name.

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 high at 80%, so the schema already documents most parameters. The description mostly restates the target options already present in the schema and adds no meaningful detail about workingDirectory or other optional parameters.

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 and resource: 'Ask Codex to review code', and clarifies what can be reviewed (git diff range, file paths, snippet) and what is returned (specific, actionable feedback). It is clear from 'review' how this differs from siblings like codex_explain_code, though it does not explicitly name them.

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 communicates the context clearly: use this tool when you want Codex to review code, and it tells the agent what to supply ('Provide a git diff range, file paths, or a code snippet.'). It does not explicitly mention alternatives or when-not-to-use, so it stops short of a 5.

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