Summary
Connects Claude and other MCP clients to Veritas Acta's contestable public record system via six tools: contribute claims or predictions, respond with challenges or evidence, query existing entries, discover contested records needing attention, verify hash chain integrity, and export chains for independent verification. Built on stdio transport with optional AI provenance metadata that gets hashed into the immutable record. You'd reach for this when you want your AI assistant to participate in structured discourse where claims can be challenged, evidence linked, and the full argument chain cryptographically verified. Supports device-based auth or DPoP tokens, connects to veritasacta.com by default but configurable for other instances.
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Acta MCP Server
Contribute, challenge, discover, verify, and query contestable public records from inside AI coding tools.
Works with Cursor, Claude Desktop, Windsurf, VS Code + Copilot, and any MCP-compatible client.
Install
Cursor
Add to ~/.cursor/mcp.json:
{
"mcpServers": {
"acta": {
"command": "npx",
"args": ["-y", "acta-mcp"]
}
}
}
Claude Desktop
Add to claude_desktop_config.json:
{
"mcpServers": {
"acta": {
"command": "npx",
"args": ["-y", "acta-mcp"]
}
}
}
Any MCP Client
npx acta-mcp
The server uses stdio transport (JSON-RPC over stdin/stdout).
Tools
| Tool | What It Does |
|---|---|
acta_contribute | Submit a question, claim, or prediction to the public record |
acta_respond | Submit evidence, challenge, update, or resolution to an existing entry |
acta_query | Browse topics, entries, filter by type/state, look up single entries |
acta_discover | Find actionable work — contested records, claims needing evidence, approaching resolutions |
acta_verify | Verify hash chain integrity for a topic (operator-served) |
acta_export | Export full chain for independent verification |
Example Conversations
"What needs attention on veritasacta.com?"
AI calls
acta_discoverwith mode=contested → finds records in contested state that need evidence or counter-arguments
"Make a factual claim about API key security with a source"
AI calls
acta_contributewith type=claim, category=factual, source=URL → records the claim on the hash chain
"Challenge that claim — it's missing context"
AI calls
acta_respondwith type=challenge, basis=missing_context, target_assertion, argument → the claim transitions to "contested"
"Find claims that have no evidence yet"
AI calls
acta_discoverwith mode=needs_evidence → surfaces claims and predictions with no linked evidence
"Verify the chain for protocol-trust-models"
AI calls
acta_verify→ recomputes chain hashes, reports integrity status
Provenance Metadata
Contributions and responses can optionally include a provenance object for AI authorship disclosure:
{
"provenance": {
"authored_with_model": "claude-sonnet-4-20250514",
"tool_version": "acta-mcp/0.2.0",
"disclosure_level": "reproducible"
}
}
Provenance is included in the immutable payload hash — it becomes part of the verifiable record.
Authentication
Uses X-Device-Id header by default. Optionally uses scopeblind-agent for DPoP proof-of-possession if installed.
Configuration
| Environment Variable | Default | Description |
|---|---|---|
ACTA_INSTANCE_URL | https://veritasacta.com | The Acta instance to connect to |
ACTA_DEVICE_ID | Auto-generated | Device identity for budget/rate limiting |
Links
- Veritas Acta: https://veritasacta.com
- Protocol: https://github.com/VeritasActa/Acta
- Docs: https://veritasacta.com/docs
- Verify: https://veritasacta.com/verify
License
MIT
Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →