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

Annotations already cover safety (readOnly, idempotent, non-destructive, openWorld), so the description correctly focuses on additions: pricing ($0.01 USDC per successful call via x402 on Solana) and an HTTPS equivalent endpoint. It also notes that results include direct document and filing-index links. No rate limits or pagination behavior disclosed, keeping it from a 5.

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 with no filler; the primary capability and the two modes are front-loaded, and the pricing/endpoint metadata is packed at the end. Slightly long but every clause carries information.

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?

No output schema exists, but the description tells the agent what comes back (filings plus direct document and filing-index links) and covers cost and transport. It omits result ordering and error behavior, a minor gap for a read-only search tool with full annotation coverage.

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 baseline would be 3, but the description adds cross-parameter semantics: q switches the tool into full-text mode, and company is only needed in the other mode. It also implicitly clarifies scope defaults (all filings for full-text), supplementing the schema's per-mode default note.

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 (SEC EDGAR filings search) and delineates two distinct modes: latest-filings lookup by name/ticker/CIK, and full-text search since 2001 via ?q=. An agent can distinguish this from siblings like sec_financials, sec_form4, and sec_13f from the description alone.

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?

Clearly indicates when each mode applies: company mode for latest 10-K/10-Q/8-K or any form, full-text mode when ?q= is supplied, optionally scoped to one company, form types, and date range. It does not explicitly name sibling alternatives (e.g. sec_form4 for insider filings), 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.