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

Annotations declare readOnlyHint=false, idempotentHint=false and destructiveHint=false, and the description is consistent with a non-destructive mutation ('just a counter'). It adds that no text is transmitted and that consent is required, but it never explains what the counter is, whether the acknowledgement is visible to others, or what happens on repeat calls (relevant given idempotentHint=false).

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 English sentence is tight and front-loaded, but the French half is a verbatim restatement that adds no information for an agent and roughly doubles the payload. The core content earns its place; the duplication does not.

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 one-parameter mutation with no output schema, the description covers intent and consent but omits what the acknowledgement counter means, whether it is user-visible, and any return/error behavior. It is adequate but leaves real gaps for a state-changing call.

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 there is a single required 'id' parameter already documented as 'Id of the trace'. The description adds no meaning about the id beyond the schema, 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 ('silent acknowledgement of a trace') and clarifies the operation's nature ('no text, just a counter'), which separates it from siblings like leave_trace that presumably attach content. It never names a sibling explicitly, so differentiation is by implication rather than by routing.

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?

'Only if your user is fine with it' gives a soft consent condition, implying usage requires user approval, but it never states when to choose this over flag_trace or leave_trace. The guidance is implied rather than actionable.

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