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

With no annotations provided, the description carries the full burden, and it does a good job: it discloses the payment requirement, price, payment address, HTTP 402 behavior for unpaid requests, and that a valid X-PAYMENT makes the same URL return JSON. It does not cover edge cases like invalid payment, but the core behavioral contract is transparent.

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 description is compact and packs several important facts into a short space: pricing, endpoint, chunk semantics, payment failure behavior, and JSON response. It is slightly dense and opens with payment details rather than the resource purpose, but almost every sentence earns its place.

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 an unannotated paid HTTP endpoint with no output schema, the description covers the essential operational context: what to pay, where to pay, what happens when unpaid, how to request the official text, and how to page backward. It could be more explicit about how a valid X-PAYMENT is obtained, but the core workflow is understandable.

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 100%, so the baseline is 3. The tool description adds some context beyond the schema, such as the $0.02 cost for id and the $0.05 cost for newer/older chunks, but most parameter meaning is already fully documented in the input 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 identifies the resource as "UK CMA CA98 infringement-decision text" and explains that a plain GET returns the newest chunk while ?id returns one official text. It makes the endpoint's function reasonably clear, though it never uses a crisp verb like "retrieve" and does not distinguish it from sibling tools beyond the resource name.

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?

Usage is implied: this is the tool for a CMA CA98 infringement-decision text, with plain GET for the newest chunk, ?id for the official catalog text, and ?before for older chunks. It does not explicitly say when to choose this over sibling tools or name any alternatives, so guidance is only contextual rather than direct.

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