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

With no annotations, the description carries the full burden and does disclose important behavior: the call is paid ($0.01 USDC on Base), payment is in-band via x402 MCP with a _meta 'x402/payment' field, and a day pass can bypass it. It does not describe the return shape or any rate limits, but cost/auth disclosure is genuinely valuable context not present in structured fields.

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 purpose in the first clause, followed by payment and endpoint details. It is short and mostly earns its place, though the raw URL and package name are somewhat operational noise for an agent that uses the MCP tool.

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 paid data-retrieval tool with no output schema and no annotations, the description covers the payment path well but says nothing about what the returned regime values look like or how to interpret 'raw values and rules'. Adequate but with a clear gap in output expectations.

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 coverage is 100% and the single optional 'pass' parameter is fully documented in the schema, including its source and that it skips per-call payment. The description adds no parameter syntax or format detail beyond that, so the baseline 3 applies.

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 concrete verb+resource: it performs a 'crypto regime check' and returns 'raw values and rules'. However, 'Stage 1' is unexplained jargon and the description does nothing to distinguish it from siblings like get_full_signal or get_band_dots, so it clears the bar for clarity but not differentiation.

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?

No when-to-use guidance is given: it never says when an agent should call get_regime versus get_full_signal, get_band_dots, or get_daily_brief, nor what preconditions apply. The only routing information is the alternate HTTP endpoint and payment mechanics, which is access info rather than usage guidance.

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