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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the agent knows this is a non-destructive write; the description is consistent with that. It adds that the emission is manual and phase-scoped, but says nothing about persistence, idempotency, duplicate handling, or required authorization — meaningful gaps for a write tool.

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 short sentences, front-loaded with the core action and no filler; 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?

For a 7-parameter write tool with no output schema, the description covers purpose and audience but leaves out what happens on emission (persistence, confirmation, failure behavior) and any note that the optional fields (level, source, metadata, duration_ms) are optional. Adequate but with clear gaps.

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% and both enums (level, status) are documented in the schema, so the baseline is 3. The description adds no syntax, default, or semantic detail beyond what the schema already provides.

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+resource+scope: 'Manually emit a telemetry event for a job pipeline phase.' The word 'Manually' cleanly distinguishes it from the read-side siblings (get_job_telemetry, get_active_telemetry, get_telemetry_logs) and from automatic/system telemetry emission, so an agent can tell write-event from read-event without opening a schema.

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?

The second sentence ('Used by kernels and agents to report execution progress') gives implied context on who calls it and why, but there is no explicit when-to-use vs when-not, no mention of alternatives (e.g. system_telemetry or send_diagnostics), and no stated prerequisites.

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