et_log_action

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

No annotations are provided, so the description carries the full burden. It conveys the key behavioral trait that the entry becomes persistent compliance evidence, but discloses nothing about permissions, durability/flushing, failure behavior, or latency. The buffering hint ("subsequent flushes in this session") appears only in the schema, not the description.

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 sentences, zero filler, with the purpose front-loaded and the invocation trigger immediately after. Every sentence earns 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?

For a 5-parameter write tool with no output schema and no annotations, the description covers purpose and when to call it, and the schema fills in field-level detail. It omits session/flush semantics and the fact that modelId only needs to be set once, which are relevant operational facts.

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 100% with 5 parameters, so the schema already documents every field including enum-like actionType names and the 500-char limits. The description adds no syntax, format, or default information beyond what the schema provides, so the 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?

The description states a specific verb ("Log") and resource ("an agent action as compliance evidence in EvidentTrail"), so an agent immediately knows this writes an audit record. With no sibling tools present, there is nothing to differentiate from, so the lack of alternative routing costs it the top mark rather than reflecting vagueness.

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?

"Call this whenever you perform a significant action" gives explicit trigger conditions and even parenthetical examples (file edit, API call, decision) that map onto the actionType values. It stops short of stating when-not to call it (e.g. trivial/read-only steps) or any batching guidance.

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