Signed Investors
REMOTE · MCP.SIGNED.COM · SCANNED SEP 26
Search Signed's public angel investor directory by sector, check size, or keyword. No login needed.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability75
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 1173 tokens (~167/item across 7 items; 7 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management7
- Stability observed for 2 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 7 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 8 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (2026-07-28).Pass
How do I install the Signed Investors MCP server?
Signed Investors is a hosted endpoint at https://mcp.signed.com/investors, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · mcp.signed.com
claude mcp add --transport http com-signed-investors 'https://mcp.signed.com/investors'
{
"mcpServers": {
"com-signed-investors": {
"url": "https://mcp.signed.com/investors"
}
}
} {
"servers": {
"com-signed-investors": {
"type": "http",
"url": "https://mcp.signed.com/investors"
}
}
} [mcp_servers.com-signed-investors] url = "https://mcp.signed.com/investors"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"com-signed-investors": {
"type": "remote",
"url": "https://mcp.signed.com/investors",
"enabled": true
}
}
} openclaw mcp add com-signed-investors --url 'https://mcp.signed.com/investors' --transport streamable-http
mcp_servers:
com-signed-investors:
url: "https://mcp.signed.com/investors" {
"McpServers": {
"com-signed-investors": {
"Transport": "http",
"Url": "https://mcp.signed.com/investors"
}
}
} assistant mcp add com-signed-investors -t streamable-http -u 'https://mcp.signed.com/investors'
{
"mcpServers": {
"com-signed-investors": {
"type": "http",
"url": "https://mcp.signed.com/investors"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 25 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 24 Sept 26 74
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 26 Sept 2026 · Probed https://mcp.signed.com/investors
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=mcp.signed.com | CN=WE1,O=Google Trust Services,C=US | 15 Sept 2026 | 14 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | d40abb9baa7fc8670e0db5407d59e5a4 |
| SANs: mcp.signed.com | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of mcp.signed.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| signed.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000; includeSubDomains |
| content-security-policy | default-src 'self' https:; font-src 'self' https: data:; img-src 'self' https: data:; object-src 'none'; script-src 'self' https://kit.fontawesome.com https://ka-f.fontawesome.com https://a.signed.com https://ga.jspm.io https://esm.sh 'unsafe-inline'; style-src 'self' https: 'unsafe-inline'; connect-src 'self' https: |
| x-content-type-options | nosniff |
| x-frame-options | SAMEORIGIN |
| referrer-policy | strict-origin-when-cross-origin |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://mcp.signed.com/investors | Verified | 200 | |
| http (plaintext) | http://mcp.signed.com/investors | HTTPS enforced | 301 | https://mcp.signed.com/investors |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
get_investor ~109
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 investors. Logins come from search_investors or list_investors, or from a signed.com/@login URL. Private profiles are indistinguishable from nonexistent ones.
| Name | Type | Req | Description |
|---|---|---|---|
| login | string | yes | The investor's login, with or without the leading @. |
No output schema declared.
No examples provided.
list_check_sizes ~53
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.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
list_investor_followers ~99
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.
| Name | Type | Req | Description |
|---|---|---|---|
| login | string | yes | The investor's login, with or without the leading @. |
| page | integer | – | 1-indexed page number (default 1). |
| per_page | integer | – | Results per page (default 30, max 100). |
No output schema declared.
No examples provided.
list_investor_following ~98
Public Signed investors the given investor follows, alphabetically by name. Only public profiles appear on either side, the same as signed.com/@login/following.
| Name | Type | Req | Description |
|---|---|---|---|
| login | string | yes | The investor's login, with or without the leading @. |
| page | integer | – | 1-indexed page number (default 1). |
| per_page | integer | – | Results per page (default 30, max 100). |
No output schema declared.
No examples provided.
list_investors ~200
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 they invest in, the checks they write, their pinned portfolio companies, and whether they take pitches. Use search_investors when you have a name or a keyword.
| Name | Type | Req | Description |
|---|---|---|---|
| check_size | string | – | Only investors writing checks in this range. Takes the slug (10k-25k) or the label ($10K-$25K); list_check_sizes has both. |
| page | integer | – | 1-indexed page number (default 1). |
| per_page | integer | – | Results per page (default 30, max 100). |
| sector | string | – | Only investors who list this sector. Takes the slug (devtools, fintech, health); list_sectors has the full set with names. |
No output schema declared.
No examples provided.
list_sectors ~61
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 sectors first.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
search_investors ~231
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 that sector. Only public profiles are searched. Add sector or check_size to narrow the hits; use list_investors to browse a facet without a keyword.
| Name | Type | Req | Description |
|---|---|---|---|
| check_size | string | – | Only investors writing checks in this range. Takes the slug (10k-25k) or the label ($10K-$25K); list_check_sizes has both. |
| page | integer | – | 1-indexed page number (default 1). |
| per_page | integer | – | Results per page (default 30, max 100). |
| q | string | yes | Search text, matched against name, login, bio, investment description, and sector names and slugs. |
| sector | string | – | Only investors who list this sector. Takes the slug (devtools, fintech, health); list_sectors has the full set with names. |
No output schema declared.
No examples provided.
What is the Signed Investors MCP server?
Signed Investors is an MCP server listed in the public MCP registry as com.signed/investors. Search Signed's public angel investor directory by sector, check size, or keyword. No login needed. This page covers its hosted endpoint (https://mcp.signed.com/investors).
Is the Signed Investors MCP server safe to use?
Signed Investors scores 74 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Signed Investors MCP server expose?
Signed Investors exposes 7 tools: search_investors, list_investors, get_investor, list_investor_followers, list_investor_following, and 2 more. Their descriptions and schemas cost roughly 851 tokens of context every time the server is loaded.
Does the Signed Investors MCP server require authentication?
No. We connected to Signed Investors without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Signed Investors MCP server still maintained?
Signed Investors is still listed as active in the MCP registry. We last reached this channel on 26 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.