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

Annotations cover the safety profile (readOnlyHint=false, destructiveHint=true, openWorldHint=true, idempotentHint=false), so the bar is lower. The description still adds real value beyond them: it clarifies no secrets are stored here and that the definition alone grants no runtime access, describing the follow-up CLI workflow. It does not explain the destructive/overwrite semantics implied by destructiveHint=true, which is the main remaining gap.

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 core purpose before the workflow caveat. Minimal waste, though the CLI/verification tail could be tightened slightly. Structure is good and every sentence carries 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?

For a save tool with no output schema and annotations already declaring the safety profile, the description supplies the key missing context: no secret values, and no runtime access from the definition. The overwrite/destructive behavior flagged by annotations is not addressed, but overall an agent has what it needs to invoke this correctly.

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 57%, above the midpoint baseline. The schema already documents company, environment, idempotency_key, expected_version, and fields.name. The description only adds the general notion that fields hold names/labels (no values), which marginally clarifies the fields array but does not compensate for the undocumented required params (name, integration).

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: 'Define a custom integration's credential names and labels,' reinforced by 'No secret values.' This distinguishes it from the credentials-writing siblings, though it never names them explicitly. Clear enough to pick apart from summer_credentials_set, but the differentiation is implied rather than stated.

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?

Gives useful workflow context ('Saving a definition does not establish runtime access; upload secrets through the local CLI and verify an agent-usable path'), which tells the agent this is one step in a sequence. However, it never points to a specific alternative tool for the secret-upload step and provides no exclusions or prerequisites for when to call this versus other save tools. Usage is implied rather than explicit.

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