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

Annotations already declare this is a non-read-only, destructive, idempotent operation, so the safety profile is covered structurally. The description adds the behavioral caution against speculative invocation, which is useful, but it does not disclose the scope-expanding side effect of the markAllAsFixed parameter. With annotations carrying the mutation severity, a 3 is appropriate.

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 tight sentences with zero filler. The core action is front-loaded and the caution follows immediately; every clause 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?

There is no output schema, so an agent must infer return behavior, but the description plus the annotations and fully-covered schema give enough to invoke it correctly. The only modest gap is the implications of markAllAsFixed, which the schema already explains.

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%, so all three parameters including markAllAsFixed are documented in the schema itself. The description adds no syntax or behavioral detail about them, 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 and resource: 'Mark a log message as fixed by ID,' which tells an agent exactly what mutation occurs and on which entity (identified by logId/messageId). It is clear enough to distinguish from read-oriented siblings like messages_get or messages_list_recent, though it does not explicitly contrast with adjacent mutators such as messages_hide or messages_open.

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?

It gives explicit when-to-use and when-not-to-use guidance: only call when the user has explicitly asked to mark an error as fixed, and never speculatively while investigating. That is a real constraint agents otherwise get wrong. It stops short of naming an alternative tool for speculative investigation, which keeps it below a 5.

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