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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=true, idempotentHint=true), so the core behavior is covered. The description adds valuable auth context (write scope), but does not explain what 'destructive' means here, whether omitted optional fields are cleared or preserved, or the effect on the record.

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 action and followed by the prerequisite. No wasted words and no restatement of the schema.

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 whose annotations carry the safety profile and whose schema fully documents parameters, the description covering purpose plus scope is nearly complete; no output schema exists so return values needn't be described. The only gap is not clarifying partial-update semantics for the 7 optional fields.

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% across all 8 params, so the schema already documents id, title, content, author_id, timeframe, project_id, period_year, and period_value. The description adds nothing parameter-specific, so baseline 3 is appropriate.

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 ('Update an existing project update') and identifies the record by ID, which separates it from update_project and update_project_comment. It is clear what the tool does, though it doesn't explicitly name a sibling or contrast itself with list/get variants.

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 scoping requirement ('Requires project_updates:write scope') is a useful prerequisite, but the description never says when to reach for this tool versus get_project_update (read) or delete_project_update, nor when-not to use it. Usage is implied by the update verb rather than stated.

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