Nc Protocol MCP Server

nc-protocol

Public wire contracts, Model Context Protocol (MCP) tool schemas, and agent protocol definitions for Node Command.

This repository is the canonical source of truth for the public Node Command contracts. It contains strictly declarative schemas and contracts: no proprietary server code, no database schemas, and no secrets.

Consumers — the Node Command hub, the nc-agent runtime, and client integrations — vendor this repository at a pinned commit, so contract changes here are explicit and auditable.

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Namespaces

agent/     Hub ↔ Agent wire protocol (hello / welcome / request / reply / heartbeat)
mcp/       Canonical authoring definitions and contract manifest
policy/    Public host-policy projection + capability names
browser/   Public browser and egress policy schemas
bindings/  Generated language bindings (JavaScript ESM)

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Consuming the contracts

There is no runtime dependency to install: consumers vendor this repository at a pinned commit SHA and import from the vendored tree.

git clone https://github.com/huseyincig/nc-protocol.git

Import the JavaScript bindings directly:

import {
  MCP_TOOL_CONTRACT_VERSION,
  MCP_TOOL_MANIFEST_FINGERPRINT,
  MCP_TOOL_NAMES,
  HOST_POLICY_CAPABILITY_NAMES
} from './nc-protocol/bindings/javascript/contracts.mjs';

JSON schemas can be imported by path:

import helloSchema from './nc-protocol/agent/hello.schema.json' with { type: 'json' };
import toolsIndex from './nc-protocol/mcp/tools/index.json' with { type: 'json' };

The current contract version, fingerprint, and capability list are pinned in mcp/contract-version, mcp/fingerprint, and policy/capability-names; the current generation and rollout rules are in COMPATIBILITY.md.

The manifest counts canonical authoring definitions, not the number of tools available to a particular connected user. The hosted platform composes these definitions into its public nc_ surface and filters discovery by role and scope. Use that server's authenticated tools/list response for callable names and schemas; do not invoke an authoring identifier merely because it appears here. Internal operation identifiers and the agent wire protocol remain distinct.

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Testing & Validation

nc-protocol has zero runtime dependencies and uses the native Node.js test runner:

# Clone the repository
git clone https://github.com/huseyincig/nc-protocol.git
cd nc-protocol

# Run test suite
npm test
# Or:
node --test tests/*.mjs

The test suite validates:

1. Presence of all required namespace files.
2. Exact matching between tool definitions, mcp/tools/index.json, and tool count.
3. Cryptographic consistency of the canonical sha256 manifest fingerprint.
4. Schema parse validity and schema draft conformance.
5. Binding parity with declarative contract files.

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Contributing

See CONTRIBUTING.md for detailed guidelines on how to propose new tools, update schemas, recompute fingerprints, and submit pull requests.

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Versioning & Compatibility

• VERSIONING.md — SemVer lifecycle and breaking-change policies.
• COMPATIBILITY.md — Current contract generations and rollout gates.

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Related repositories

• NodeCommand — product documentation, client examples, and manifests.
• nc-agent — the open-source host agent and CLI installer that implements these contracts.

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License

Apache-2.0 — see LICENSE.