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

Annotations already declare destructiveHint=true, idempotentHint=false and openWorldHint=true, and the description adds a meaningful scope boundary ('does not grant roles or approve a plan'). It still omits the key behavioral consequences: that assigning replaces an existing owner, that a stale `previous` produces a conflict, and that the call is non-idempotent even though an idempotency_key exists.

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 compact sentences with the action stated first and the scope exclusion second; nothing is filler. The conflict-check clause is terse enough to be slightly cryptic, which costs a point.

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 destructive mutation with no output schema, the description is thin: it does not say what a successful call returns, how a conflict is surfaced to the caller, or what permissions are required. An agent could construct the call but would not know how to interpret or recover from failure.

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 14%, so the description must carry the load, and it does explain the non-obvious `previous` argument as a conflict check and implies memberId is the new owner/reviewer. But case, company, environment and especially the nullable `requestId` (whose relationship to idempotency_key is unclear) get no explanation at all.

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 (assign) and target roles (issue owner / plan reviewer) on a case, which clearly separates it from the read-only sibling summer_cases_assignment_read. The trailing phrase 'with the previous owner as a conflict check' is a mechanism rather than purpose and slightly muddies an otherwise clear statement.

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?

'Does not grant roles or approve a plan' gives a useful negative boundary that steers an agent away from approval/grant tooling such as summer_actions_approve. However, it never states the positive precondition (e.g., you must have read the current assignment first, or that the call fails on a stale `previous`), so the when-to-use case is only implied.

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