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

With readOnlyHint=false, idempotentHint=true, and destructiveHint=false already declared, the description adds meaningful context the annotations don't: 'Does not notify the owner or mark the brief out of date,' plus the return shape. This is real side-effect disclosure rather than a restatement of the annotations.

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?

The purpose is front-loaded and every sentence carries information (preconditions, parameter format, side effects, return value). It is dense but skimmable, with no filler sentences, though it is longer than strictly necessary.

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 annotations covering the safety profile and no output schema, the description is nearly complete: it covers preconditions, parameter format, side effects, and the return value ('the action with assignedTo and ownerName'). Little an agent needs to invoke it correctly is missing.

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?

The schema is an empty object (0 params), which sets a baseline of 4, and the description adds genuine semantics for the implied fields: 'assignedTo is a member's user id or sign-in email; pass null to unassign' and a pointer to devtune_get_actions for valid owner ids. This compensates for the undocumented 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?

The description opens with a specific verb+resource pair: 'Rename an action, set its owner, or both,' which clearly states the mutation scope. It is distinct from sibling reads like devtune_get_actions and creates like devtune_create_prompt_action, though it never names a sibling to reinforce the distinction.

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 preconditions and negative cases: 'Works on accepted and live actions; restore an archived action first' and 'DevTune's suggestions... accept one first.' This tells the agent when the tool will and won't succeed, but it does not name an alternative tool for those preconditions.

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