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

Annotations only declare readOnlyHint=false and destructiveHint=false; the description adds two genuinely useful behaviors beyond that: the plaintext token is returned exactly once and must be stored, and an admin scope is required. It does not mention session expiry or what happens on budget exhaustion, which would have pushed this higher.

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 with zero waste; the critical one-time-token warning and the scope requirement are both front-loaded rather than buried. Nothing could be removed without losing information.

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?

With no output schema, the description correctly covers the key return value (the plaintext token, delivered once) and the authorization requirement. For a four-parameter creation tool that is nearly sufficient; only lifecycle details such as expiry or revocation path are absent.

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 coverage is 100%, so all four parameters including the budget default and uniqueness constraint on name are already documented in the schema. The description adds nothing about parameter meaning, so the baseline 3 applies.

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: 'Mint a new agent-multiplayer session.' That is clearly distinct from credential siblings like create_repo_token or create_deploy_token, though the description never explicitly contrasts with them. An agent can identify the operation without opening the schema.

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 description supplies a prerequisite ('Requires admin scope'), which helps gate usage, but offers no when-to-use guidance against the many token/credential siblings (get_token, create_repo_token, rotate_token). The context of use is implied by the name rather than stated.

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