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Agent Company Index MCP server

Which servers in the official MCP registry are Agent Company Index's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-24

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Whose server it is
  • Registry namecom.agentcompanyindex/directoryverified in the MCP registry

The registry name sits under agentcompanyindex.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-24
  • Stateanswerschecked 2026-10-24
  • Tools10
  • Server calls itselfaci-public-directory
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-24 the server answered initialize and tools/list without a sign-in. First answer in 184 ms.

Should an agent connect itNot proven either way yet
  • Its tools do every use case we checked: Request a reviewed listing for your company; Check a provider's fit and limitations before recommending it; Let AI assistants read structured company profiles.
  • Checked on 2 of the 7 days it takes to judge reliability.

Once connected

  • For "Request a reviewed listing for your company", the likely first call is request_listing.
  • For "Check a provider's fit and limitations before recommending it", the likely first call is get_offering.
  • update_listing_answers change data without a sign-in: anyone with the address can call them.
  • Parameters are untyped or undescribed in 10 of 10 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 2, the first on 2026-10-24
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 2 so far
  • What an agent can do with it3 of 3 use cases
  • Answeredmeasuring2 of the 7 daily checks it takes to print a share
  • Median first answer599 ms
  • Space in an agent's context≈ 4,950 tokensthe definitions of all its tools (10), which an agent carries on every turn
  • Tool definitionsB · 83 of 100
  • Typed results0 of 10 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 10 of 10

What an agent can do with it

  • can do · Request a reviewed listing for your company
  • can do · Check a provider's fit and limitations before recommending it
  • can do · Let AI assistants read structured company profiles

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

  • Tools that change data, on a server that answers without a sign-in: update_listing_answers

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (30%), doing the product's job (25%), definitions (20%), context (10%) and use (15%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers10 tools · read 2026-10-24
  • discover_offerings

    Browse every published offering in the Agent Company Index (B2B software and services, sourced facts, explicit limitations), in stable alphabetical order. Prefer search_offerings when the user describes a need; use this to page through…

  • get_offering

    Get the full sourced record of one offering by slug: who it is for and not for, limitations, prerequisites, data residency, pricing visibility, contract terms, open questions, the company's relationship to ACI's operator, and a source…

  • search_offerings

    Use when a user is looking for a B2B software product, service provider or agency (e.g. "website maintenance for a small company in Germany", "time tracking with DATEV export") and wants options backed by sourced facts and stated…

  • evaluate_situation

    Check a structured buyer situation (category, company size, country, requirements) against every published offering and get each offering's fit or exclusion with reasons, limitations and unknowns. Each result states its group: fit…

  • request_listing

    List one offering of the company you act for in the Agent Company Index. Listing is free. Before calling, fill answers from the company's website and ask the user for the rest: what problem the offering solves (primary_problem), who it…

  • update_listing_answers

    Send or correct the company's structured answers (the complete set; it replaces the previous one). Once a draft exists this requests changes: ACI prepares a new revision from the answers within a few minutes, and any earlier approval no…

  • verify_listing_domain

    Prove control of the company domain for a listing request: pass email_code with the code the user received at the company address, or call without it after the DNS TXT record or the /.well-known/aci-verification.txt file is in place.

  • get_listing_status

    Read the state of a listing request and what to do next: the domain-proof options, the prepared draft with its revision digest (facts, which of them are company statements, what ACI checked itself, open questions), the Listing Terms the…

  • approve_listing

    Approve publication of the exact draft revision on behalf of the company and accept the Listing Terms (LT-2, https://agentcompanyindex.com/legal/listing-terms/lt-2) for it. Requires a verified domain. Before calling: show the user the…

  • request_listing_removal

    Remove a company from the Agent Company Index on behalf of that company. Give the company's domain and a work email address on exactly that domain (ask the user for it). ACI emails a private confirmation link to that address; once someone…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "directory": {
      "type": "http",
      "url": "https://agentcompanyindex.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http agentcompanyindex https://agentcompanyindex.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://agentcompanyindex.com/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.