# Ambr

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

- name: io.github.getambr/ambr-mcp-server
- version: 0.3.0
- connection class: R0 (autonomous)
- trust: 86/100
- quality: 88/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/io.github.getambr%2Fambr-mcp-server
- tools: https://api.protogrid.dev/v1/servers/io.github.getambr%2Fambr-mcp-server/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

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


## Trust

- hygiene: 100
- liveness: 100
- freshness: 45
- provenance: 90
- drivers: +repository +namespace-matches-repo +website +reachable +uptime-100% -stale-182d
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 88/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 93 (weight 30)

- pass `tools.descriptions`: every tool has a description
- warn `tools.description_length`: 1 tools have descriptions over 1,024 characters, which crowds the context
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 6 of 6 tools declare readOnlyHint or destructiveHint
- pass `tools.directory_hints`: every tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
- pass `tools.token_cost`: about 1,861 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: no tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 6, about 1,861 tokens to load them all
- tool set hash: 5a88098607aa8481a9867b48441484db
- badge: [![protogrid quality](https://protogrid.dev/badge/io.github.getambr/ambr-mcp-server.svg)](https://protogrid.dev/servers/io.github.getambr/ambr-mcp-server)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://getamber.dev/api/mcp (streamable-http, auth none, reachable true, uptime30d 1)

## Packages

_none_

## Tools (6)

- `ambr_agent_handshake`: 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 wallet signature on the Reader Portal.

Args:
  - contract_id (string, required): Contract ID (amb-YYYY-NNNN), SHA-256 hash, or UUID
  - intent (string, required): "accept" | "reject" | "request_changes"
  - message (string, optional): Note for the counterparty
  - visibility_preference (string, optional): "private" | "metadata_only" | "public" | "encrypted"

Returns: Handshake status and next steps for principal approval.

Legibility: the handshake itself is auditable — delegation scope, agent identity, and principal approval are recorded alongside the contract hash.
- `ambr_create_contract`: 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) with available credits.
Use ambr_list_templates first to discover templates and their required parameters.

Args:
  - template (string, required): Template slug (e.g. "d1-general-auth")
  - parameters (object, required): Template-specific parameters matching the schema
  - principal_declaration (object, required): { agent_id, principal_name, principal_type }
  - parent_contract_hash (string, optional): SHA-256 hash of parent contract for amendments
  - oversight_threshold_usd (number, optional): spending level above which work created under
    this contract needs human approval. Children exceeding it halt at awaiting_principal_approval.
  - amendment_type (string, optional): "original" | "amendment" | "extension"

Returns:
  - contract_id: Unique ID (e.g. "amb-2026-0042")
  - sha256_hash: SHA-256 hash for verification
  - status: Contract status
  - reader_url: URL to view in Reader Portal
  - credits_remaining: Remaining API credits

Legibility: Output is dual-format by construction and replayable to the original SHA-256 hash — the basis of Ambr's legibility guarantee.
- `ambr_get_contract`: 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 three lookup formats:
  - Contract ID: "amb-2026-0042"
  - SHA-256 hash: 64-character hex string
  - UUID: Standard UUID format

Args:
  - id (string, required): Contract ID, SHA-256 hash, or UUID

Returns: Full contract (if authorized) or metadata-only response.

Legibility: retrieval preserves the dual-format pairing — prose and JSON always replay to the same SHA-256.
- `ambr_get_contract_status`: 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_id, status, created_at
  - amendment_type, parent_contract_hash
  - amendments: Array of child contracts (if any)

Legibility: amendments are bilateral and themselves dual-format — the chain stays legible from original through every revision.
- `ambr_list_templates`: 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 required.

Returns: Array of template objects with slug, name, description, category,
parameter_schema, price_cents, and version fields.

Legibility: templates are the parameter schema for the dual-format contracts you create — starting here keeps your request conformant and your output defensible.
- `ambr_verify_hash`: 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:
  - verified: boolean
  - contract_id: string (if found)
  - status: string (if found)
  - reader_url: string (if found)

Legibility: verification is the point at which legibility becomes provable — matching hash means the prose a human reads and the JSON a machine parses are the same document that was originally signed.