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

Annotations already cover the safety profile (readOnly, openWorld, non-destructive), and the description adds real value on top: it discloses the cost model ($0.02 or plan key) and the pagination contract (cursor comes from next_before_block on the previous page). It does not cover result ordering/staleness, but that is a minor gap given annotation coverage.

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?

Front-loaded with the tool's identity and returned fields, then filtering, then paging, with the payment detail relegated to a trailing parenthetical. Dense but every clause carries information; no filler sentences.

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?

There is no output schema, but the description compensates by naming the returned fields (launchpad, sending wallet, transfer and recipient counts) and the paging cursor, so an agent can consume results correctly. Missing only ordering guarantees or a default-sort note.

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 description coverage is 100%, so every parameter is already documented, making 3 the baseline. The description largely restates the schema (via = launchpad filter, before_block = cursor, min_transfers), adding only the mild clarification that the cursor originates from a prior page's next_before_block.

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+resource ('Newest Arc token launches') and enumerates what each result carries: launchpad, minting wallet, transfer and recipient counts. This distinguishes it from siblings like robinx_arc_launchpads and robinx_arc_token, though it never names an alternative explicitly.

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?

Gives concrete operational guidance on filtering (via launchpad address, min_transfers) and pagination (before_block), plus the access/pricing model. However it never states when to choose this over robinx_arc_launchpads or robinx_arc_token, so usage is implied rather than routed.

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