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

With no annotations, the description carries the full burden. It usefully discloses result ordering (newest first) and defines what each event type actually means, which is real domain behavior. It does not state that the tool is read-only, whether results are paginated or truncated by limit, or any auth/rate-limit constraints.

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 compact sentences with the core purpose front-loaded and no filler. The enum glossary is telegraphic ("type 'reset' = ..."), which is efficient but slightly abrupt as prose.

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 simple two-parameter read tool with full schema coverage and no output schema, the description covers purpose, ordering, and filter semantics well. The main remaining gap is that it never says the default is 'all' or how limit interacts with the result set, though the schema covers the defaults.

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 100%, so the baseline would be 3, but the description goes beyond the schema's generic "Event type filter" by defining each enum value: 'reset' as verified global resets, 'credits' as banked-reset sightings, 'all' as both. That distinction is not derivable from the enum names alone. The limit parameter is left entirely to the schema, which documents it adequately.

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?

"List recorded Codex events, newest first" gives a specific verb (list) and resource (Codex events) plus a result ordering. It does not name the sibling tools (get_latest_reset, get_reset_stats), so the agent must infer the boundary from the plural/collection framing rather than being told explicitly.

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?

Usage is implied: this is the collection-listing tool, so it is the right choice when the agent wants many events rather than the single latest one. There is no explicit when-to-use/when-not statement and no mention of the siblings that would make the choice unambiguous.

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