Countersign MCP
Countersign provides an independent, signed verification service for AI-generated work. It re-computes arithmetic, validates quotes against cited sources, checks link accessibility, and parses code syntax. The server returns a signed pass, fail, or inconclusive stamp with detailed error descriptions, logging every verification in a public, verifiable ledger to ensure independence and auditability.
Endpoint and access
No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.
https://countersign.llpro.ai/mcpWhat its tools do
3 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.
Not annotated (3)
Checks and signals
Each line is separate evidence, not a trust score.
- Passed Endpoint answered the live check ·
- Passed Official MCP Registry namespace is tied to countersign.llpro.ai ·
- Passed Endpoint is on the registry namespace domain ·
- Availability 1 of 1 checks passed in 30 days
What you can do with it
- Verify arithmetic calculations in AI outputs
- Validate quotes against cited source documents
- Check accessibility of links provided in reports
- Parse and verify code syntax without execution
Source and maintenance
Protocol and capabilities
- Server
- countersign 1.0.0
- MCP protocol negotiated in check
- 2025-03-26
- Tools
- 3 advertised
- Resources
- Not advertised
- Resource templates
- Not advertised
- Prompts
- Not advertised
{
"tools": {}
}Tools
3 advertised
countersign_stamp
Use when you need an independent, signed check of work you or another agent produced (a report, calculation, summary, filing draft or code) before relying on it or handing it on. Countersign re-computes arithmetic, looks up quotes and values in the cited sources, opens links and parses code, then returns a signed stamp (pass, fail or inconclusive) saying exactly what is wrong, with time and method. The stamp is kept in a public log. It never checks work it produced.
{
"type": "object",
"required": [
"output",
"producer"
],
"properties": {
"kind": {
"enum": [
"report",
"calculation",
"summary",
"filing_draft",
"code",
"other"
],
"type": "string"
},
"claims": {
"type": "array",
"items": {
"type": "object"
},
"description": "Optional explicit items: {type:'arithmetic', expression, claimed} or {type:'quote', source_url, quote} or {type:'value', source_url, value}"
},
"output": {
"type": "string",
"description": "The work to check, as text (max 100000 chars). Equations written as '12 * 4 = 48' are re-computed."
},
"private": {
"type": "boolean",
"description": "If true the public log shows only a hash of each finding's detail; you still get the full detail"
},
"sources": {
"type": "array",
"items": {
"type": "object"
},
"description": "Optional cited sources: {url, quote?}"
},
"language": {
"type": "string",
"description": "For code: python or json get a syntax check"
},
"producer": {
"type": "object",
"required": [
"agent_id"
],
"properties": {
"model": {
"type": "string"
},
"agent_id": {
"type": "string"
}
},
"description": "Who made the work: {agent_id, model}. Required; used for the independence rule."
}
}
}countersign_verify
Confirm a Countersign stamp is real: give a stamp id (and optionally the work, to confirm the stamp is for exactly that text). Returns whether it is in the public log and whether its hash and signature are valid.
{
"type": "object",
"required": [
"id"
],
"properties": {
"id": {
"type": "string"
},
"output": {
"type": "string"
}
}
}countersign_log
Read the public stamp log (newest after a sequence number) and its head hash and public key.
{
"type": "object",
"properties": {
"after": {
"type": "integer"
},
"limit": {
"type": "integer"
}
}
}Prompts
Not advertised
Resources
Not advertised
90-day uptime
A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.
- 2026-11-09: 2 of 2 checks answered
- 2026-11-10: 1 of 1 checks answered
30-day availability
Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.
- Successful checks
- 1 of 1 (100%)
- Average latency
- 625 ms
- 95th percentile latency
- 625 ms
Maintenance history
Public check and source-refresh events. Editorial and ownership records remain private.
- · probe · passed · 625 ms · metadata changed · 3 tool(s)
Connect from your client
Each snippet registers the same endpoint; pick the client you use.
Claude Code
claude mcp add --transport http countersign-mcp-llpro https://countersign.llpro.ai/mcpCodex
codex mcp add countersign-mcp-llpro --url https://countersign.llpro.ai/mcpCursor
{
"mcpServers": {
"countersign-mcp-llpro": {
"url": "https://countersign.llpro.ai/mcp"
}
}
}Cline
{
"mcpServers": {
"countersign-mcp-llpro": {
"type": "streamableHttp",
"url": "https://countersign.llpro.ai/mcp",
"disabled": false
}
}
}VS Code
{
"servers": {
"countersign-mcp-llpro": {
"type": "http",
"url": "https://countersign.llpro.ai/mcp"
}
}
}Gemini CLI
gemini mcp add --transport http countersign-mcp-llpro https://countersign.llpro.ai/mcpClaude Desktop
https://countersign.llpro.ai/mcpWindsurf
{
"mcpServers": {
"countersign-mcp-llpro": {
"serverUrl": "https://countersign.llpro.ai/mcp"
}
}
}Let your agent find its tools
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Do you run Countersign MCP?
Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.