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

Annotations already declare destructiveHint=true and idempotentHint=true, so the safety profile is partly covered; the description adds the non-obvious behavioral facts: patch semantics, per-user ownership enforcement, and the specific error case for missing or foreign ideas. It does not explain what "destructive" means here (e.g. that idea_text is overwritten wholesale), which is left to the schema.

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?

Three short sentences, front-loaded with the action and scope, then the mutation semantics, then the failure condition. No sentence is redundant with the title or 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 5-parameter mutation tool with no output schema and destructiveHint=true, the description covers ownership, patch behavior and error cases adequately. It omits what a successful call returns, which an agent might reasonably want given no output schema.

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 baseline is 3, and the description earns an increment by clarifying the semantics of the optional parameters as a group — omitted fields are left untouched rather than cleared. The per-field meaning of id, status and idea_text is fully carried by the schema.

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 ("Partially update a content idea") with ownership scope, which cleanly separates it from create-idea, get-idea and the update-* siblings for other resources. It stops short of naming a sibling or contrast alternative explicitly.

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 the fields you pass are changed" implies when this is the right call (incremental edits rather than full replacement), and the ownership error clause sets a precondition. But there is no explicit guidance on when to use this versus create-idea or get-idea first, 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.