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

With no annotations, the description carries the full burden and does so: it declares the operation read-only with no side effects, states the return medium and size (text/plain, ~500 tokens), and confirms the absence of parameters. Cost/size disclosure and safety profile are both present, leaving no behavioral surprises.

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-loads the payload contents, then the use/when-not-to-use routing, then the operational facts; every clause is informative. The trailing fragment 'No parameters.' is minor redundancy against an already-empty schema, keeping it just short of maximum.

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 zero-parameter, side-effect-free fetch with no output schema, the description covers what it returns, its approximate size, its safety profile, and how it relates to sibling artifacts. Nothing an agent needs to invoke it correctly is missing.

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?

The tool takes zero parameters, which the rubric sets at a baseline of 4. The description reinforces this with 'No parameters', consistent with the empty schema and 100% coverage, though it adds no further semantic value beyond confirming the 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?

States a specific verb ('Get') and resource ('the Designesy /llms.txt') and enumerates the payload (canonical reference, topic index, ingest steps, package list, contact). It also names the sibling tools it must not be confused with (designesy_llms_full_txt, designesy_contract), so an agent can distinguish it without opening any 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?

Gives an explicit use-first rule ('Use this first when you don't know what Designesy is'), a rationale ('cheapest orientation path before pulling heavier artifacts'), and an explicit when-NOT-to-use section that routes to the full brief and the contract tool. Both the selection and exclusion conditions are spelled out.

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