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

Annotations only say write, non-idempotent, non-destructive. The description goes far beyond: it enumerates the returned credentials (manage key, read-only public key), the seeded products collection, base URL and claim_url, warns that the project is deleted after 72 hours unless claimed, and states concrete quotas (250 req/day, 3 collections, 100 records). No account or API key is required. This is exactly the extra context annotations cannot supply.

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?

Front-loaded with the core capability, then usage, then return values/side effects. Every sentence is functional, though the return-value list, the claim_url instruction, and the quota list are three packed concerns in one paragraph that could be slightly tighter.

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 input or output schema, the description carries the full explanatory load and does so: what is created, what comes back, the critical claim_url action, the 72-hour expiry risk, and usage limits. An agent can invoke this correctly and relay the necessary follow-up step to the user.

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?

Zero parameters, so the baseline of 4 applies. There is no parameter surface for the description to clarify or for the schema to leave undocumented.

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+resource with scope: 'Create a real hosted backend (a REST API with a persistent database) in one call.' It is unmistakably distinct from the sibling tools, which all operate on an already-existing project (create_collection, create_record, list_records), making this the top-level provisioning step.

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?

Explicit when-to-use: 'when the user needs to store data, persist an app or prototype, or give a frontend a live API.' It also implicitly serves as the prerequisite for every sibling tool. No explicit when-not or named alternative is given (e.g., reusing an existing project instead of provisioning another), so it falls short of a 5.

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