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sMCPBY
A stoic swan facing right, woven from intricate black contours, signal points, and vermilion nodes.

Open intelligence.
Explicit permission.

An open protocol for capabilities,
consent, and execution.

Read the protocol

Move across the field to turn it. Bind to return.

Introducing Dokens. A token system for agent work.

Meet Dokens

Change one thing.

One approval. One exact run. Alter the request and inspect the consequence.
>_ smcp / approval_sandboxLOCAL EXECUTION / SHA-256
Type help for commands. ↑ / ↓ for command history.
Edit the task input

APPROVED TASKDraft a launch plan from my project brief.

Same task → allow. Changed task → deny.
verify approved

The request matches the approved input, manifest, scopes, task, and price.

HASHING
CONSTRAINTAPPROVEDREQUESTEDResult
Computing the approval and request bindings…
Inspect request & full hashes

Computing hashes locally…

EXAMPLE, NOT A LIVE AGENT RUNProduction bindings are derived and checked on the server.

Real hashes, computed in your browser. Each case starts with a fresh example approval. No agent is called and no payment is made. This illustrates run binding, not host signature verification.

INTRODUCING / THE TOKEN SYSTEM FOR sMCP

Dokens.

A unit for useful work.

We’re bringing Dokens to sMCP so creators can build agents and monetize their use—on their own properties, in DiviDen, and through exponentialOS.

You build the capability and define its price. Dokens connects paid usage to the work, wherever people encounter your agent.

Explore Dokens

sMCPPermission to act.

DokensA unit of exchange.

DISTRIBUTION / 02 ROUTES

YOUR.DOMAIN

Your interface. Your audience.

Keep the experience on your own website or app. Connect a DiviDen account through OAuth, then request approval for the agent’s work.

  1. 01
    ACCOUNT

    Sign in with DiviDen

    OAuth connects the user’s account to your property.

  2. 02
    AGREEMENT

    Approve the work.

    sMCP binds the task, permissions, and approved charge.

  3. 03
    EXCHANGE

    Agent use, in Dokens.

    The token system connects the user’s paid usage with the creator’s agent.

Dokens integration concept. Sign-in and payment approval are separate.

A PRECISE BOUNDARY

A declaration.
An exact agreement.

sMCP adds a security and governance layer to agent communication: declared capabilities, explicit consent, and rules around execution. It works over MCP and A2A.

01

IDENTITY

Know what you’re calling.

A capability manifest declares what an agent can do. Host attestation signs its fingerprint with Ed25519. A pinned public key and a drift check let the platform verify the declaration.

manifest → SHA-256 → Ed25519

A fingerprint match is not the same as a verified signature.

02

MODEL BOUNDARY

Keep prose out of authority.

Publisher descriptions are untrusted input. The manifest firewall gives the model an allowlisted view of structured capabilities, schema hashes, scopes, and prices. Free-text instructions stay outside that view.

untrusted manifest → allowlisted view

The full manifest hash remains bound to the approval.

03

AUTHORIZATION

Approve one exact run.

The broker binds a one-time approval to the manifest, task, input, scope set, and charge ceiling. It derives the binding again at dispatch. A changed binding needs fresh approval.

approval binding === dispatch binding

Single use. Time limited. Computed on the server.

04

EXECUTION

Guard both directions.

Outbound requests are checked for private-network targets, unsafe redirects, and DNS rebinding. Returned content passes a deny-by-default guard before reaching the user.

validate egress → execute → guard return

One-time execution does not implicitly grant durable agent memory.

IMPLEMENTATION NOTE

DiviDen is the reference implementation. Whole-run consent is the active default. Field-level, time-limited, revocable consent is implemented behind an optional enforcement flag. Host-attestation enforcement is also configuration dependent.

THE WIRE CONTRACT

Start with
a declaration.

Discover a node. Inspect its capabilities. Agree on the task. Verify the host.

Explore the specification
01 / DISCOVER A NODE
$ curl -H 'SMCP-Version: 0.1' \
https://smcp.denominator.ventures/.well-known/dividen-agent.json

Public endpoint. No credentials required.

01

Node discovery

Supported versions, public cards, and the node’s protocol entry points.

02

Capability manifest

Public capabilities and task metadata. Credentials and private dispatch details stay out.

03

Task contract

Input and output schemas, permission scopes, pricing, and settlement terms.

04

Host attestation

A manifest fingerprint and signature, verified against the registered host key.

Wire version 0.1 is a draft. Before 1.0, minor versions may change shapes. An unsupported version returns the node’s preferred version with a negotiation mismatch for the client to handle.

THE REFERENCE ECOSYSTEM

One protocol.
More possibility.

The security foundation behind DiviDen and exponentialOS. Built by Denominator for a world where anyone can do anything.

Read the work.
Build on it.

DOCUMENTATION

OPEN SOURCE. OPEN TO WHAT COMES NEXT.

Build what’s possible.
Define what’s permitted.

Read the specification

MIT-licensed protocol and reference implementation. View license ↗