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Signed MCP server

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

read 2026-10-15

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Whose server it is
  • Registry namecom.signed/investorsverified in the MCP registry

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

When we asked itchecked 2026-10-15
  • Stateanswerschecked 2026-10-15
  • Tools7
  • Server calls itselfsigned-investors
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-15 the server answered initialize and tools/list without a sign-in. First answer in 173 ms.

Should an agent connect itSkip it
  • Its tools do none of the product's use cases we checked: Track portfolio value, returns, and multiples across positions; File founder updates and round announcements into position records; Prepare per-entity packets for the accountant at tax time.
  • Checked on 6 of the 7 days it takes to judge reliability.

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: 6, the first on 2026-10-19
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 6 so far
  • What an agent can do with it0 of 3 use cases
  • Answeredmeasuring6 of the 7 daily checks it takes to print a share
  • Median first answer205 ms
  • Space in an agent's context≈ 1,423 tokensthe definitions of all its tools (7), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results0 of 7 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • cannot · Track portfolio value, returns, and multiples across positions
  • cannot · File founder updates and round announcements into position records
  • cannot · Prepare per-entity packets for the accountant at tax time

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

None of the five warning signs in these definitions.

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 offers7 tools · read 2026-10-15
  • search_investors

    Search Signed's public angel investor directory by keyword: a name, a login, or a word from an investor's bio or investment description ("climate", "former founder", "pre-seed"). A query that names a sector also matches investors who list…

  • list_investors

    Browse Signed's public angel investor directory: every investor with a public profile, most complete profiles first, optionally narrowed to one sector or one check size. Each result carries the investor's login (for get_investor), what…

  • get_investor

    One angel investor's public Signed profile by login: bio, investment description, sectors, check size, links, the portfolio companies they've pinned, whether (and where) they take pitches from founders, follower counts, and a few similar…

  • list_investor_followers

    Public Signed investors who follow the given investor, alphabetically by name. Only public profiles appear on either side, the same as signed.com/@login/followers.

  • list_investor_following

    Public Signed investors the given investor follows, alphabetically by name. Only public profiles appear on either side, the same as signed.com/@login/following.

  • list_sectors

    The sectors an investor can list on their Signed profile — the valid values for the sector filter on list_investors and search_investors — with how many public investors list each, a one-line description, and example companies. Busiest…

  • list_check_sizes

    The check-size ranges an investor can list on their Signed profile — the valid values for the check_size filter on list_investors and search_investors — smallest to largest, with how many public investors write each.

How to connect

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

{
  "mcpServers": {
    "investors": {
      "type": "http",
      "url": "https://mcp.signed.com/investors"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http signed https://mcp.signed.com/investors

Add to CursorAdd to VS Code

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

Other servers listed as Signed's
  • com.signed/signedanswers, requires sign-inverified in the MCP registry

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.