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

Annotations already cover read-only, idempotent, non-destructive safety, so the bar is lower; the description still adds real value by naming the backing table (admin_change_history), enumerating what mutations are captured (update_agent_config, business rules, phone secretary, dashboard), and stating that every entry is reversible via rollback_config.

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?

A single dense sentence, front-loaded with the verb and resource, followed by field list and provenance. The aside about the voice tool is slightly decorative but supports the provenance claim, so it earns most of its place.

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?

With an output schema present, return-value detail is optional, and the description still names the key fields. Combined with full schema coverage and annotations, nothing essential is missing, though a note on ordering/recency window would close the last gap.

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% and both parameters (agent_id, limit with default 20 / max 100) are fully documented in the schema. The description adds no parameter-level meaning such as ordering or time-window semantics, so baseline 3 applies.

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?

States a specific verb and resource ('List an agent's recent config-change audit trail') and enumerates the record's fields, so the agent knows exactly what comes back. It does not, however, distinguish itself from the overlapping sibling list_config_versions, which an agent may confuse with this audit trail.

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 only implied: 'Every mutation KaiCalls makes to an agent ... is logged here' tells the agent what will be found, and the rollback_config mention hints at a follow-up action. There is no explicit when-to-use/when-not guidance and no comparison against list_config_versions.

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