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

Annotations already declare readOnlyHint=false, idempotentHint=true and destructiveHint=false, so the safety/idempotency profile is covered. The description adds only the vague phrase 'using privacy-filtered project metadata' and does not explain what is mutated, conflict/versioning behavior, or permissions beyond what annotations and schema already state.

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 short sentence with no padding, so it is concise, but it is concise at the cost of being uninformative rather than front-loading useful detail. Appropriate size is not the issue; content is.

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 mutation tool with 11 required parameters, no output schema, and version-conflict semantics implied by expectedVersion/expectedProjectVersion, the description is grossly inadequate. It neither explains the operation nor helps an agent understand the preconditions or outcome.

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 only 55%, and the description contributes no parameter meaning at all. Several parameters (graphDigest, resultSummary, resultingMeterKey, baseSourceFingerprint, resultingSourceFingerprint) have no schema descriptions either, so the burden is unmet. The schema also contains a copy-paste defect where requestId and sessionId reuse the projectId description, which the description does nothing to resolve.

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 largely restates the tool name ('Update hosted apply implementation meter change'), which is essentially a tautology. It does not clarify what an 'implementation meter change' is or how it differs from close siblings like queue_implementation_meter_request or get_pending_implementation_meter_changes.

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?

No when-to-use, when-not-to-use, or alternative guidance is given. An agent cannot tell from this text whether it should call this tool or the closely related queue_implementation_meter_request / get_pending_implementation_meter_changes siblings.

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