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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description adds only the scope of content it covers, and with no output schema it does not say what form the answer takes (prose guide vs. structured steps) or how large it is.

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?

A single compact sentence with the subject front-loaded and no filler. The trailing 'read margins back' is slightly awkward phrasing, but nothing is redundant.

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 informational tool the definition is adequate but thin: it lists topics without indicating that the result is reference documentation, without noting it is the natural first call before estimate_llm_cost or get_margin_overview, and without any sense of return size or format.

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, so the baseline is 4; there is nothing for the description to disambiguate. It correctly implies a no-argument call.

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 names the resource (FiscaLLM setup) and enumerates the concrete topics covered: ingestion paths (OpenTelemetry, LiteLLM, SDK, HTTP), revenue connection, and margin readback. That is enough for an agent to tell it apart from the sibling cost/margin tools, though it never uses an explicit verb such as 'returns a setup guide'.

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 only implied: the title 'How to set up FiscaLLM' suggests calling it during onboarding, but the description never says when to call it, whether it should precede the cost/margin tools, or what an agent should do instead if it already knows the setup. No exclusions or alternatives are stated.

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