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

Annotations already declare readOnlyHint and idempotentHint, and the description adds substantial behavioral context: the exact returned fields, the distinction between integrated platforms versus browser-tool site platforms, and the relevant chain_ids. There is no contradiction with annotations.

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 description is a single dense sentence that front-loads the action and resource and contains no filler. Every clause contributes either a returned field, a defining characteristic, or a downstream usage instruction.

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?

Given there is no output schema, the description fully compensates by enumerating the returned fields and explaining the integrated-versus-site distinction. It also supplies chain context and downstream guidance, making it complete enough for correct invocation.

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 schema already documents chain_id with 100% coverage, including default '5042002 and alternative 5042. The description merely reinforces the chain_ids but does not add new parameter-level meaning beyond what the schema provides, so the baseline 3 is appropriate.

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 uses a specific verb ('List') and resource ('launcher platforms on Circle's Arc') and explicitly enumerates what is returned: slug, live availability, platform fee, and integrated versus site platform distinction. This clearly differentiates it from sibling list tools like launchpad_list_tokens.

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?

The description gives clear context by stating the operation is about cross-launching tokens from EventTrader and explicitly tells the agent to pass the returned slugs to launchpad_launch_token. It stops short of an explicit when-to-use-versus-Alternatives comparison, but the use case is clear enough.

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