List Supported Chains

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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive), so the bar is lower, and the description earns credit by explaining the meaning of the returned compatibility flags and the special Solana identifier. It still says nothing about return shape or ordering, which a no-output-schema tool would benefit from.

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?

Two dense sentences, front-loaded with what the tool lists before the flag semantics, with no filler. The parenthetical chainId detail is compact, though the second sentence is information-packed enough to border on terse.

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 no input parameters and no output schema, the description carries the burden of explaining the return values and does so for the two named flags (lookup, drop). 'Per-feature compatibility' implies additional feature flags that are never enumerated, leaving a small gap.

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 there is nothing for the description to document and the baseline is 4. No parameter-related gaps exist.

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 and resource ('List product chains') plus the distinguishing attribute ('with per-feature compatibility'). An agent can tell this apart from the connect_lookup/connect_drop siblings by topic, though the description never explicitly contrasts itself with them.

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 implied rather than stated: describing which flags are true for which chain types and noting the Solana chainId for connect_drop/connect_drop_balance hints this is a pre-flight capability check. There is no explicit 'use this when…' or 'do not use for…' guidance, so the agent must infer the workflow.

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