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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), and the description adds real context on top: 'Free' discloses there is no cost/quota, 'as they land' indicates a live feed rather than a batch, and it bounds availability to the last three UTC days. It does not disclose result caps, ordering, or pagination, which limits it to a 4.

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 dense but purposeful sentences: capability first, then return-field notes, then use cases. The telegraphic 'For: ...' construction is slightly awkward and the 'same_second' aside is parenthetically crammed in, but nothing is padding.

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 output schema, the description carries the burden of describing returns and does so for the distinctive fields (seconds from launch, same_second flag, deployer record on day mode). It omits result ordering, volume, and any cap on number of coins returned, which leaves a real gap for a list-style tool.

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 schema already spells out the YYYY-MM-DD day window and the unix-seconds 'since' semantics, so the description largely restates rather than extends it. The one clarification it adds is the either/or relationship between 'day' and 'since' and the default ten-minute window, which is also already in the schema.

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 precisely: pump.fun coins whose bonding curve completed, with two mutually exclusive retrieval modes (last hour via 'since', or a whole UTC day of the last three via 'day'). An agent can tell this is a graduation feed rather than a launch feed, though it does not explicitly name the sibling it is not (launches_since).

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 'For:' sentence gives three concrete triggering questions (what just graduated, how many graduated today, which graduated in the same second) and names the follow-up tool (check_coin on a mint). No explicit exclusion such as 'use launches_since for pre-graduation coins', so it falls short of a 5.

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