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

Annotations already flag destructive/openWorld/non-idempotent, and the description adds genuinely new context beyond them: that execution may create records or settle an authorized fee, that the server never signs wallets, that off-host and operator routes are denied, and that an unsigned call returns an x402 challenge. This is exactly the behavioral detail annotations cannot carry.

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 write-gate and return behavior are front-loaded, and each sentence carries information (denials, payment, API schema link). It is dense with domain jargon (SML, x402, SqueezeOS) that slightly taxes first-read parsing, but there is no redundant filler.

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?

With an output schema present, the description need not detail return values, yet it still sketches the two outcomes (target result or x402 challenge). Combined with auth/fee handling, denial rules, and a link to the API schema, an agent has everything needed to invoke it safely.

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%, so the baseline is 3, but the description adds real meaning: confirm_write is a write authorization gate, payment_signature is caller-signed and authorizes the published SML service fee (server does not sign), and the path must be a concrete public path rather than a full URL. It goes beyond restating the schema fields.

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 states a concrete verb and resource — 'Execute one public SqueezeOS REST path with POST' — and constrains scope to public paths while denying operator routes and off-host URLs. It is clear what the tool does, though it never names the sibling it competes with (e.g. call_capability / read_capability), so differentiation is inferred from scope rather than stated.

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?

It gives a hard prerequisite ('after confirm_write=true'), notes that a caller-signed payment_signature may be needed to settle the published fee, and discloses that operator routes and off-host URLs are rejected. No explicit alternative tool is named for when this is the wrong choice, so it falls short of full when/when-not guidance.

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