MCP server

Ambr

io.github.getambr/ambr-mcp-server

Checked 28 Oct 2026, 09:03 UTC · Connected to it and listed its tools

Ricardian contracts for AI agents — dual-format, SHA-256 bound, legible by construction.

Website Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

6

Token cost

About 2,198 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

28 Oct 2026, 09:03 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http ambr-mcp-server https://getamber.dev/api/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.ambr-mcp-server]
url = "https://getamber.dev/api/mcp"

Gemini CLI

{"mcpServers":{"ambr-mcp-server":{"httpUrl":"https://getamber.dev/api/mcp"}}}

Cursor

{"mcpServers":{"ambr-mcp-server":{"url":"https://getamber.dev/api/mcp"}}}

VS Code

{"servers":{"ambr-mcp-server":{"type":"http","url":"https://getamber.dev/api/mcp"}}}

Antigravity

agy mcp add ambr-mcp-server https://getamber.dev/api/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"ambr-mcp-server","server_url":"https://getamber.dev/api/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"ambr-mcp-server","server_url":"https://getamber.dev/api/mcp"}

Tools

• ambr_agent_handshake ~417 tokens
  Initiate a handshake on a contract on behalf of your delegating principal. Requires an API key with an active delegation (principal wallet registered via /api/v1/delegations). Records the agent's intent to accept, reject, or request changes on the contract. The principal must separately approve via
• ambr_create_contract ~868 tokens
  Generate a Ricardian Contract from a template. Creates a dual-format contract (human-readable legal text + machine-parsable JSON) using AI, linked by SHA-256 hash. The contract is stored on Ambr and accessible via the Reader Portal. Requires a valid API key (X-API-Key header on the HTTP request) w
• ambr_get_contract ~255 tokens
  Retrieve a contract by ID, SHA-256 hash, or UUID. With a valid API key (contract creator): returns the full contract including human-readable text, machine-readable JSON, status, and principal declaration. Without authentication: returns metadata only (contract_id, status, hash, dates). Supports t
• ambr_get_contract_status ~219 tokens
  Check the status of a contract and its amendment chain. Returns the current status and any linked amendments (parent or child contracts). Useful for verifying if a contract is active, amended, or terminated. Args: - id (string, required): Contract ID, SHA-256 hash, or UUID Returns: - contract
• ambr_list_templates ~202 tokens
  List available contract templates on Ambr. Returns all active Ricardian Contract templates with their slugs, names, descriptions, categories, parameter schemas, and pricing. Use this to discover which templates are available before creating a contract with ambr_create_contract. No authentication r
• ambr_verify_hash ~237 tokens
  Verify a contract's SHA-256 hash to confirm document integrity. Checks whether the provided hash matches a contract stored on Ambr. Returns verification status, contract metadata, and Reader Portal URL if found. Args: - hash (string, required): SHA-256 hash (64-character hex string) Returns:

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