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

With no annotations, the description does disclose a genuinely important behavioral trait: it is a paid call costing $0.07 USDC on Base, settled in-band via x402 with the `_meta "x402/payment"` key, and there is an HTTP fallback. It says nothing about result size, ordering, time window defaults, or what happens on unpaid calls, leaving real gaps for a metered tool.

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?

Three compact sentences with the data description front-loaded, followed by pricing and the alternate access path. The endpoint URL is arguably redundant given the MCP transport but is short and harmless.

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 six-parameter, unannotated, no-output-schema tool, the description covers only payment mechanics. It never explains what a 'growth lane' or 'rule' is, how the five filter parameters shape the response, or what a snapshot looks like — the agent cannot confidently construct a call.

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 only 17% — of six parameters only `pass` carries a description. The description does not compensate: kind (chain/app/all), weeks, minTvlUsd, triggerOnly, and minRulesPassed are unexplained in both places, so the agent must guess whether these filter snapshots or the underlying rules.

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 resource and scope: 'Weekly growth-lane snapshots and the week each rule first passed', which tells an agent exactly what data comes back. It does not differentiate itself from siblings like get_growth_screen or get_growth_setup, so the agent must infer that this is the time-series counterpart to those screens.

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 statement of when to call this versus get_growth_screen, get_growth_setup, or get_history. The only actionable guidance is payment-related (in-band x402 or an alternate GET endpoint), which is useful but is not use-case guidance.

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