Form4API — SEC Insider Trading

list_companies

Read-only

List companies with a public ticker, sorted by name or total filings. Returns a single page of companies that have a tracked public ticker — for browsing or building a company picker, not for searching by name or CIK (there is no full-text search here; use GET /v1/companies/{ticker} to fetch one company by its exact ticker). Each entry includes the company's CIK, name, ticker, exchange, total filing count, and distinct insider count. There is no page parameter — this endpoint always returns the top limit companies by the chosen sort order. Not plan-gated.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "list_companies"
  }
}

Input Schema

Name	Required	Description	Default
`sort`	No	Sort order: "name" (alphabetical, default) or "totalfilings" (most SEC filings first). Case-insensitive; unrecognized values fall back to "name".
`limit`	No	Maximum number of companies to return. Defaults to 50, maximum 50.

Schema Changelog

Changes observed during successful MCP inspections.

First observedNov 13, 2026

TDQS

A4.9/5.0

Behavior5/5

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

Annotations already indicate readOnly and openWorld. Description adds that it returns a single page, always top limit, sort order behavior (case-insensitive, fallback), and no page parameter. No contradictions.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Single paragraph with logical flow: purpose, usage constraints, entry details, sort behavior. Efficient but could be slightly more concise.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Covers purpose, use cases, entry fields, sort behavior, limits, plan access. No output schema but details what each entry includes, making it complete for agent understanding.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% but description adds meaning: explains sort options (name/totalfilings), default, case-insensitivity, fallback; clarifies limit defaults and max; explains no page parameter.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description clearly states the tool lists companies with public tickers, sorted by name or total filings, for browsing or building a company picker. It distinguishes from sibling tool by directing to use GET /v1/companies/{ticker} for exact ticker search.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly states when to use (browsing/picker) and when not (searching by name/CIK), provides alternative endpoint, explains no page parameter and default sort behavior. 'Not plan-gated' adds clarity.

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

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