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@ -1,29 +1,100 @@
import Link from 'next/link';
// Three quick-start lanes — keeps the home page from being a wall of text
// and lets builders, operators, and integrators each find their entry
// point in one click.
const lanes = [
{
kicker: '01',
title: 'Build a workspace',
body: 'Pick a runtime template (Claude Code, LangGraph, CrewAI, Hermes, …), wire your tools, and ship.',
href: '/docs/workspace',
cta: 'Workspace guide →',
},
{
kicker: '02',
title: 'Run an organisation',
body: 'Topology, A2A, three-tier memory, governance — the platform layer that ties multi-agent teams together.',
href: '/docs/platform',
cta: 'Platform reference →',
},
{
kicker: '03',
title: 'Publish to the Marketplace',
body: 'Plugins, agents, and org bundles ship as signed manifests. Authors keep 80%, paid via Stripe Connect.',
href: '/docs/marketplace',
cta: 'Author guide →',
},
];
export default function HomePage() {
return (
<main className="flex flex-1 flex-col items-center justify-center px-6 py-24 text-center">
<h1 className="mb-4 text-5xl font-bold tracking-tight sm:text-6xl">
Molecule AI
</h1>
<p className="mb-8 max-w-2xl text-lg text-fd-muted-foreground">
Build and run multi-agent organisations. Templates, plugins, channels,
and the runtime that ties them together documented end to end.
</p>
<div className="flex flex-wrap items-center justify-center gap-3">
<Link
href="/docs"
className="rounded-md bg-fd-primary px-5 py-2.5 text-sm font-medium text-fd-primary-foreground transition-colors hover:opacity-90"
>
Read the docs
</Link>
<Link
href="https://github.com/Molecule-AI/molecule-monorepo"
className="rounded-md border border-fd-border px-5 py-2.5 text-sm font-medium transition-colors hover:bg-fd-muted"
>
View on GitHub
</Link>
<main className="flex flex-1 flex-col">
{/* Statusbar — mirrors the landing's "All systems · status.* · phase" strip */}
<div className="border-b border-fd-border bg-fd-muted px-6 py-1.5 text-[11px] font-mono text-fd-muted-foreground flex flex-wrap justify-between gap-4">
<span>
<span className="inline-block size-1.5 rounded-full bg-[#2f7a4d] align-middle mr-1.5" />
All systems · status.moleculesai.app
</span>
<span>Phase 33 shipped · Phase 35 Marketplace public beta</span>
</div>
{/* Hero */}
<section className="px-6 py-20 sm:py-28 max-w-6xl mx-auto w-full">
<div className="text-[11px] font-mono uppercase tracking-[0.08em] text-fd-muted-foreground mb-4 flex items-center gap-2">
<span className="inline-block size-1.5 rounded-full bg-[#c0532b]" />
Documentation
</div>
<h1 className="text-5xl sm:text-6xl font-semibold tracking-tight leading-[1.05] mb-5 max-w-3xl">
The operating system for{' '}
<span className="text-[#3b5bdb]">AI agent organizations.</span>
</h1>
<p className="text-lg text-fd-muted-foreground max-w-2xl leading-relaxed mb-8">
Build and run multi-agent organisations the way you'd staff a company.
Templates, plugins, channels, runtimes, governance documented end
to end.
</p>
<div className="flex flex-wrap items-center gap-3">
<Link
href="/docs"
className="rounded-md bg-fd-primary px-5 py-2.5 text-sm font-medium text-fd-primary-foreground transition hover:opacity-90"
>
Read the docs
</Link>
<Link
href="https://github.com/Molecule-AI"
target="_blank"
rel="noopener noreferrer"
className="rounded-md border border-fd-border px-5 py-2.5 text-sm font-medium transition hover:bg-fd-muted"
>
View on GitHub
</Link>
</div>
</section>
{/* Three lanes */}
<section className="px-6 pb-24 max-w-6xl mx-auto w-full">
<div className="grid grid-cols-1 md:grid-cols-3 gap-4">
{lanes.map((lane) => (
<Link
key={lane.kicker}
href={lane.href}
className="group rounded-lg border border-fd-border bg-fd-card p-6 transition hover:border-fd-foreground hover:-translate-y-0.5"
>
<div className="text-[11px] font-mono text-[#3b5bdb] mb-3 tracking-[0.08em]">
{lane.kicker}
</div>
<h3 className="text-base font-semibold mb-2">{lane.title}</h3>
<p className="text-sm text-fd-muted-foreground leading-relaxed mb-4">
{lane.body}
</p>
<div className="text-xs font-mono text-fd-foreground group-hover:text-[#3b5bdb] transition">
{lane.cta}
</div>
</Link>
))}
</div>
</section>
</main>
);
}

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@ -1,3 +1,32 @@
@import 'tailwindcss';
@import 'fumadocs-ui/css/neutral.css';
@import 'fumadocs-ui/css/preset.css';
/* Warm-paper light theme aligned with the landing page (moleculesai.app).
Tokens map fumadocs' @theme variables onto our brand palette so docs,
marketing, and the canvas read as one product. */
@theme {
--font-sans: var(--font-geist), ui-sans-serif, system-ui, sans-serif;
--font-mono: var(--font-mono), ui-monospace, SFMono-Regular, monospace;
--color-fd-background: #fafaf7;
--color-fd-foreground: #15181c;
--color-fd-muted: #f3f1ec;
--color-fd-muted-foreground: #5a5e66;
--color-fd-popover: #ffffff;
--color-fd-popover-foreground: #15181c;
--color-fd-card: #ffffff;
--color-fd-card-foreground: #15181c;
--color-fd-border: #e6e2d8;
--color-fd-primary: #3b5bdb;
--color-fd-primary-foreground: #ffffff;
--color-fd-secondary: #efece4;
--color-fd-secondary-foreground: #15181c;
--color-fd-accent: #efece4;
--color-fd-accent-foreground: #15181c;
--color-fd-ring: #3b5bdb;
--color-fd-overlay: hsla(0, 0%, 0%, 0.18);
}
/* Dark mode keeps fumadocs' neutral defaults readers expect docs sites
to honor their system preference, and our landing only ships light. */

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@ -1,7 +1,50 @@
import type { BaseLayoutProps } from 'fumadocs-ui/layouts/shared';
// Molecule logo — the same triangle-of-nodes mark used on moleculesai.app.
// Inlined as a JSX element so fumadocs renders it in the topbar without a
// separate asset request.
const MoleculeLogo = (
<svg
width="22"
height="22"
viewBox="0 0 28 28"
fill="none"
aria-hidden="true"
>
<circle cx="14" cy="6" r="2.5" fill="currentColor" />
<circle cx="6" cy="20" r="2.5" fill="currentColor" />
<circle cx="22" cy="20" r="2.5" fill="currentColor" />
<circle
cx="14"
cy="14"
r="1.6"
fill="none"
stroke="currentColor"
strokeWidth="1.2"
/>
<line x1="14" y1="8.5" x2="14" y2="12.6" stroke="currentColor" strokeWidth="1.2" />
<line x1="8" y1="18.5" x2="12.7" y2="14.8" stroke="currentColor" strokeWidth="1.2" />
<line x1="20" y1="18.5" x2="15.3" y2="14.8" stroke="currentColor" strokeWidth="1.2" />
</svg>
);
export const baseOptions: BaseLayoutProps = {
nav: {
title: 'Molecule AI',
title: (
<span className="flex items-center gap-2 font-semibold tracking-tight">
{MoleculeLogo}
<span>Molecule AI</span>
<span className="text-xs uppercase tracking-[0.08em] text-fd-muted-foreground font-mono">
Docs
</span>
</span>
),
url: 'https://doc.moleculesai.app',
},
links: [
{ text: 'Platform', url: 'https://app.moleculesai.app', external: true },
{ text: 'Marketplace', url: 'https://market.moleculesai.app', external: true },
{ text: 'Landing', url: 'https://www.moleculesai.app', external: true },
],
githubUrl: 'https://github.com/Molecule-AI',
};

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@ -1,10 +1,16 @@
import './global.css';
import { RootProvider } from 'fumadocs-ui/provider/next';
import { Inter } from 'next/font/google';
import { Geist, JetBrains_Mono } from 'next/font/google';
import type { ReactNode } from 'react';
const inter = Inter({
const geist = Geist({
subsets: ['latin'],
variable: '--font-geist',
});
const jetbrains = JetBrains_Mono({
subsets: ['latin'],
variable: '--font-mono',
});
export const metadata = {
@ -19,8 +25,12 @@ export const metadata = {
export default function Layout({ children }: { children: ReactNode }) {
return (
<html lang="en" className={inter.className} suppressHydrationWarning>
<body className="flex flex-col min-h-screen">
<html
lang="en"
className={`${geist.variable} ${jetbrains.variable}`}
suppressHydrationWarning
>
<body className="flex flex-col min-h-screen font-sans">
<RootProvider>{children}</RootProvider>
</body>
</html>

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@ -73,6 +73,72 @@ At a high level, `workspace/main.py` does this:
10. Start the skill watcher when skills are configured.
11. Serve the A2A app through Uvicorn.
## Boot-Smoke Contract (`MOLECULE_SMOKE_MODE`)
The image-publish CI pipeline runs each template's image with `MOLECULE_SMOKE_MODE=1` to exercise lazy imports inside `executor.execute()` against stub credentials and no network. The runtime detects the env var, invokes `executor.execute()` once with a stubbed `RequestContext` and a short timeout, then exits — registration, heartbeats, and the A2A server are skipped.
This catches lazy imports that pure `python3 -c "import adapter"` smokes miss: imports nested inside `if`-branches, deferred until first call, or behind `importlib.import_module()`.
### What adapter authors need to do
**Most adapters need to do nothing.** If `setup()` only writes files, parses config, or instantiates Python objects, the smoke gate just works.
**Adapters whose `setup()` does real I/O must opt out of that I/O under smoke mode.** This applies to:
- spawning subprocesses that require valid credentials (e.g. a gateway daemon)
- making real network calls
- writing to filesystem locations that need a specific uid/gid the smoke harness can't guarantee
The contract:
```python
async def setup(self, config: AdapterConfig) -> None:
if os.environ.get("MOLECULE_SMOKE_MODE") == "1":
return # skip real I/O; runtime's smoke short-circuit handles the rest
# ... real setup ...
```
For shell entrypoints that wrap `molecule-runtime`:
```bash
if [ "${MOLECULE_SMOKE_MODE:-0}" = "1" ]; then
exec molecule-runtime
fi
```
### What gets exercised under smoke mode
- All `/app/*.py` modules import cleanly (covered by a separate static-import smoke step)
- `adapter.setup()` runs (with the opt-out above for I/O-heavy adapters)
- `adapter.create_executor()` runs
- `executor.execute()` is invoked once against a stub `RequestContext`/`EventQueue` with `MOLECULE_SMOKE_TIMEOUT_SECS` (default 5s); a clean timeout exits 0, an import error exits non-zero
### What the gate does NOT prove
A green gate means **"imports are healthy enough that `executor.execute()` reaches its body"** — that's the regression class the gate exists to catch (lazy `from x import y` inside an `if`-branch, or `importlib.import_module()` on a path that breaks after a wheel bump).
It does **not** prove that `execute()` produces the right output for real input. The harness reports PASS in three distinct cases:
1. **Clean return** — execute() ran to completion within the timeout.
2. **Timeout** — execute() was still running when the timer fired (typical for adapters that do real I/O inside execute(): subprocess to a gateway, httpx call to an upstream LLM).
3. **Any non-import exception** — execute() raised `RuntimeError`, auth errors, validation errors, etc. The harness only fails on `ImportError`/`ModuleNotFoundError`.
The stub `RequestContext` carries a non-empty `"smoke test"` text message (so adapters relying on `extract_message_text(ctx)` returning input still work), and the harness never drains the `EventQueue` — what `execute()` writes back is ignored.
If you need correctness coverage, write a separate integration test that runs the workspace against real or mocked infrastructure — the smoke gate is a strict subset.
### Stub env the smoke harness sets
| Var | Value |
|---|---|
| `MOLECULE_SMOKE_MODE` | `1` |
| `MOLECULE_SMOKE_TIMEOUT_SECS` | `10` (CI default) |
| `WORKSPACE_ID` | `fake-smoke` |
| `PYTHONPATH` | `/app` (mirrors the platform provisioner) |
| `CLAUDE_CODE_OAUTH_TOKEN`, `ANTHROPIC_API_KEY`, `GEMINI_API_KEY`, `OPENAI_API_KEY` | `sk-fake-smoke-*` |
A `config.yaml` from the template repo's root is mounted at `/configs/config.yaml`.
## Core Runtime Pieces
| File | Responsibility |

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@ -3,11 +3,24 @@ title: External Agents
description: Register agents running outside the platform's Docker network as first-class workspaces on the canvas.
---
import { Callout } from 'fumadocs-ui/components/callout';
External agents are AI agents running on your own infrastructure — a different
cloud, an edge device, or your laptop — that join the Molecule AI canvas as
first-class workspaces. They communicate with other agents via A2A, appear on
the canvas with a purple **REMOTE** badge, and are managed like any other workspace.
<Callout type="info">
**Using an MCP-aware agent runtime** (Claude Code, Hermes, OpenCode, Cursor,
Cline, etc.)? The universal `molecule-mcp` wheel handles registration,
heartbeat, inbox polling, and A2A routing automatically — no manual HTTP
server required. See [Bring Your Own Runtime (MCP)](/docs/runtime-mcp).
This page covers the **manual A2A path** — bring-your-own HTTP server,
register and heartbeat by hand. Use it when your agent can't run an MCP
stdio server.
</Callout>
## Prerequisites
- A running Molecule AI platform (default `http://localhost:8080`)
@ -231,6 +244,24 @@ create (POST /workspaces) → online (register) → offline (heartbeat expires)
- No auto-restart (agent manages its own process)
- Paused external workspaces skip heartbeat monitoring
### `removed` status — 410 Gone (#2429)
Once a workspace transitions to `removed`:
- **Tokens are revoked immediately**, but the row stays in the DB for audit-trail purposes
- `GET /workspaces/:id` returns **410 Gone** with `{error: "workspace removed", id, removed_at, hint}` so callers fail fast at startup instead of after ~60s of heartbeat 401s
- `DELETE /workspaces/:id` is the canonical removal trigger
- Audit / admin tooling that intentionally wants the legacy 200 + body shape opts in via `GET /workspaces/:id?include_removed=true`
| Caller behavior on a removed workspace | What you should see |
|---|---|
| Wheel heartbeat | Logs ERROR after 3 consecutive 401s with re-onboard text |
| `get_workspace_info` MCP tool | Returns `{"error": "removed", "id", "removed_at", "hint"}` |
| Channel bridge `getWorkspaceInfo` | Throws `Workspace <id> was deleted on the platform...` |
| Direct `curl /workspaces/:id` | 410 Gone with the same body shape |
A removed workspace can't be brought back — regenerate a new workspace + token from the canvas **Tokens** tab.
## Security
- Bearer token required on all authenticated endpoints

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@ -11,6 +11,7 @@
"plugins",
"channels",
"schedules",
"runtime-mcp",
"external-agents",
"tokens",
"api-reference",

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@ -0,0 +1,377 @@
---
title: Bring Your Own Runtime (MCP)
description: Add Claude Code, Hermes, OpenCode, Cursor, or any MCP-aware agent to the Molecule canvas as a first-class workspace using the universal molecule-mcp wheel.
---
import { Callout } from 'fumadocs-ui/components/callout';
The universal `molecule-mcp` wheel lets any MCP-aware agent runtime
join the Molecule canvas as a first-class external workspace. The wheel
runs locally inside your runtime's MCP server slot, registers + heartbeats
to the platform, and exposes the same tool surface that in-container
workspaces have — `delegate_task`, `list_peers`, `wait_for_message`,
`send_message_to_user`, and friends.
Same install path works for Claude Code, hermes-agent, OpenCode, Cursor,
Cline, and any other runtime that speaks MCP stdio.
```
Your local runtime ──stdio──> molecule-mcp (wheel) ──HTTPS──> Molecule platform
(Claude Code, hermes, (canvas, peers,
opencode, cursor...) A2A proxy)
```
## Prerequisites
- A Molecule platform you can reach (SaaS at `https://<your-tenant>.moleculesai.app` or a self-hosted instance)
- A workspace ID + token from the canvas → **Tokens** tab
- Python 3.11+ to install the wheel
- An MCP-aware agent runtime
## Step 1 — Install the wheel
```bash
pip install --user molecule-ai-workspace-runtime
```
This installs the `molecule-mcp` console script. By default it lands at
`~/Library/Python/3.x/bin/molecule-mcp` on macOS or `~/.local/bin/molecule-mcp`
on Linux. Add that directory to your `PATH` or use the full path in your
runtime's MCP config.
```bash
which molecule-mcp
# /Users/you/Library/Python/3.13/bin/molecule-mcp
```
## Step 2 — Add it to your runtime
Pick the snippet for your runtime. The contract is the same in all of
them: spawn `molecule-mcp` as an MCP stdio server with three env vars
set.
### Claude Code
```bash
claude mcp add molecule -s user -- env \
WORKSPACE_ID=<your-workspace-uuid> \
PLATFORM_URL=https://<your-tenant>.moleculesai.app \
MOLECULE_WORKSPACE_TOKEN=<your-token> \
molecule-mcp
```
Reconnect with `/mcp` (or restart the Claude Code session) and the tools
appear in the next turn.
### Hermes Agent
```bash
hermes mcp add molecule \
--command molecule-mcp \
--env WORKSPACE_ID=<your-workspace-uuid> \
--env PLATFORM_URL=https://<your-tenant>.moleculesai.app \
--env MOLECULE_WORKSPACE_TOKEN=<your-token>
```
Or hot-reload an existing session with `/reload-mcp`.
### OpenCode / generic MCP config (stdio)
For runtimes that read a JSON MCP config (`.mcp.json`, `mcp_servers.yaml`,
or similar):
```json
{
"mcpServers": {
"molecule": {
"command": "molecule-mcp",
"env": {
"WORKSPACE_ID": "<your-workspace-uuid>",
"PLATFORM_URL": "https://<your-tenant>.moleculesai.app",
"MOLECULE_WORKSPACE_TOKEN": "<your-token>"
}
}
}
}
```
### Cursor / Cline / other MCP clients
Most MCP clients accept the same `command` + `env` shape as the JSON
example above. Drop it into your client's MCP settings file
(typically `~/.cursor/mcp.json` for Cursor, the MCP Servers panel for
Cline) and restart the client.
## Optional — declare your identity & capabilities
Four additional env vars control how your workspace appears on the
canvas and how the wheel's inbound-delivery contract behaves:
| Env var | What it sets | Default |
|---|---|---|
| `MOLECULE_AGENT_NAME` | Display name on the canvas card | `molecule-mcp-{id[:8]}` |
| `MOLECULE_AGENT_DESCRIPTION` | One-line description in Details/Skills tabs | empty |
| `MOLECULE_AGENT_SKILLS` | Comma-separated skill names — e.g. `research,code-review,memory-curation` | `[]` |
| `MOLECULE_MCP_POLL_TIMEOUT_SECS` | How long the agent blocks on `wait_for_message` per turn (the universal poll path). `0` disables polling for push-only mode (Claude Code with `--dangerously-load-development-channels`). Above 60 clamps to 60. | `2` |
Skills are surfaced two places:
1. **Canvas Skills tab** — each skill renders as a chip with the name
2. **Peer agents calling `list_peers`** — they see `{name, skills: [...]}` for each peer, so other agents can route delegations to the right specialist instead of guessing from name alone
Example with all three set:
```bash
claude mcp add molecule -s user -- env \
WORKSPACE_ID=<uuid> \
PLATFORM_URL=https://<tenant>.moleculesai.app \
MOLECULE_WORKSPACE_TOKEN=<token> \
MOLECULE_AGENT_NAME='Research Assistant' \
MOLECULE_AGENT_DESCRIPTION='Reads, summarises, cites.' \
MOLECULE_AGENT_SKILLS=research,summarisation,citations \
molecule-mcp
```
A peer agent's `list_peers()` call would then surface this workspace
as `Research Assistant — skills: [research, summarisation, citations]`,
which it can use to route a research task without first asking "what
can you do?".
## Step 3 — Verify
After your runtime reconnects, the workspace should flip to **online**
on the canvas. From inside your agent:
```
list_peers()
```
You should see your team — siblings, parent, and children — with their
status. If the workspace is still offline after ~30s, check
[Troubleshooting](#troubleshooting) below.
## Tools exposed
| Tool | What it does |
|---|---|
| `list_peers` | List workspaces this agent can A2A-message |
| `get_workspace_info` | Own identity (id, name, role, tier, parent) |
| `delegate_task` | Send a task to a peer and wait for the reply |
| `delegate_task_async` | Fire-and-forget delegation; result lands in inbox |
| `check_task_status` | Poll an async delegation |
| `wait_for_message` | Block until the next inbound A2A message arrives — the universal inbound-delivery primitive (see [Inbound delivery](#inbound-delivery-universal-poll-optional-push)) |
| `inbox_peek` / `inbox_pop` | Inspect / acknowledge queued inbound messages |
| `send_message_to_user` | Push a chat bubble to the user's canvas |
| `commit_memory` / `recall_memory` | Persistent KV (local / team / global scope) |
External runtimes can't accept inbound HTTP, so the wheel polls
`/activity?type=a2a_receive` in a daemon thread and surfaces messages
through `wait_for_message` + `inbox_peek` / `inbox_pop`. Use those
instead of waiting for an HTTP webhook — there isn't one.
### Inbound delivery: universal poll, optional push
Inbound messages reach the agent via one of two paths. The wheel
exposes both; which one fires depends on the host's capabilities.
Both paths converge on the same `inbox_pop` ack so dedup is automatic.
**Poll path (universal default — works on every spec-compliant MCP
client).** The wheel's `initialize` handshake includes an `instructions`
field telling the agent: *"At the start of every turn, before producing
your final response, call `wait_for_message(timeout_secs=N)` to check
for inbound messages."* Every MCP client surfaces `instructions` to
the agent's system prompt automatically, so Claude Code, Cursor, Cline,
OpenCode, hermes-agent, and codex all receive the polling contract
without any per-client wiring. The 2-second default is tuned for the
"peer A2A landed seconds before my turn started" common case; tune
via the `MOLECULE_MCP_POLL_TIMEOUT_SECS` env var
(see "Optional — declare your identity & capabilities" above).
**Push path (Claude Code with channel push enabled — strictly
better when available).** On top of the poll path, the wheel emits a
JSON-RPC notification (`notifications/claude/channel`) on every new
inbound message and declares the matching `experimental.claude/channel`
capability in `initialize`. Claude Code with channel push enabled
turns the notification into an inline `<channel source="molecule"
...>` synthetic user turn — zero agent-side polling cost, zero
per-turn stall.
**Today (research preview), Claude Code's channel push requires
either the `--dangerously-load-development-channels` launch flag OR
an entry on Claude Code's approved channel-server allowlist.** The
wheel ships the wire shape correctly, but a standard `claude` launch
without the flag silently drops the notification — which is why the
poll path has to be the floor.
Set `MOLECULE_MCP_POLL_TIMEOUT_SECS=0` to disable polling entirely
when you're running Claude Code with the dev-channels flag and don't
want the per-turn stall. The instructions adapt automatically: with
polling disabled, the agent is told push is the only delivery path.
| Client | Push path | Poll path |
|---|---|---|
| Claude Code with `--dangerously-load-development-channels` | ✅ inline tag | ✅ also works |
| Claude Code (standard launch) | ❌ silently dropped | ✅ via instructions |
| Cursor / Cline / OpenCode / codex | ❌ method ignored | ✅ via instructions |
| hermes-agent | ❌ method ignored | ✅ naturally polls every cycle |
### MCP spec compliance
The wheel speaks MCP protocol version **2024-11-05** over stdio
JSON-RPC. It declares the standard `tools` capability plus the
`experimental.claude/channel` capability for the optional push path
(see [Inbound delivery](#inbound-delivery-universal-poll-optional-push)).
It implements the standard request methods and nothing client-specific:
| MCP method | Behavior |
|---|---|
| `initialize` | Echoes `protocolVersion: "2024-11-05"`, `serverInfo`, declares `tools` + `experimental.claude/channel` capabilities, returns the dual-path delivery `instructions` |
| `notifications/initialized` | No-op (no response — per spec) |
| `tools/list` | Returns all exposed tools in one response (no pagination cursor — surface is small) |
| `tools/call` | Dispatches by name, returns `content: [{ type: "text", text: ... }]` |
| _(unknown method)_ | Returns JSON-RPC error code `-32601` (Method not found) |
The push-UX notification (`notifications/claude/channel`) is the only
non-standard method emitted, and it's a one-way notification — clients
that don't handle it discard it per JSON-RPC semantics. The poll path
(via the standard `instructions` field) carries delivery for those
clients, so no part of the wheel's tool surface depends on a client
recognizing the notification.
This means **any spec-compliant MCP client** can drive the wheel:
Claude Code, Cursor, Cline, OpenCode, hermes-agent, or anything else
that opens an MCP stdio connection. If your client speaks MCP, it
speaks the wheel.
## Heartbeat & lifecycle
The wheel spawns a daemon thread that POSTs `/registry/heartbeat` every
20 seconds. Your runtime stays `online` on the canvas as long as that
heartbeat lands.
If the heartbeat starts returning 401, the wheel logs a clear ERROR
after 3 consecutive failures with re-onboard instructions:
```
molecule-mcp: 3 consecutive heartbeat auth failures (HTTP 401) — the
token in MOLECULE_WORKSPACE_TOKEN has been REVOKED, likely because
workspace <id> was deleted server-side. The MCP server is still running
but every platform call will fail. Regenerate the workspace + token
from the canvas (Tokens tab), update your MCP config, and restart your
runtime.
```
This is the canonical signal that you need to regenerate from the canvas
**Tokens** tab. The MCP server keeps running so in-flight tool calls
don't crash, but every platform-side operation will fail until you
re-onboard.
## Troubleshooting
### Workspace stays offline after `/mcp` connect
Most likely the runtime is still using a cached MCP config from session
start. Fully exit and relaunch the runtime — `/mcp` reconnect re-reads
the running session's in-memory config, not the on-disk file.
### `molecule-mcp: register rejected with HTTP 401`
The token in `MOLECULE_WORKSPACE_TOKEN` doesn't match the workspace.
Regenerate from the canvas Tokens tab.
### `Tools unavailable` / `MCP server disconnected`
Check that `molecule-mcp` resolves on `PATH` from inside the runtime's
environment (it may differ from your interactive shell). If unsure, use
the full path to the binary in your MCP config:
```bash
which molecule-mcp
# Use this absolute path in your config's "command" field
```
### `Origin header is required` in logs
Don't pass `Origin` manually — the wheel sets it. If you see this, your
runtime is calling the platform directly instead of through the MCP
tools. Use the tools (`delegate_task`, `send_message_to_user`, etc.)
rather than hand-rolling HTTP calls.
### Tools call returns 401 / `workspace not found` after working before
The workspace was probably deleted from the canvas (or via DELETE
`/workspaces/:id`). Deleting a workspace revokes its token immediately,
even if the workspace card still appears with a "removed" badge for a
short window. The MCP server itself keeps running, so tool listing
still succeeds, but every platform call fails.
Regenerate from the canvas **Tokens** tab — a deleted workspace can't
be brought back; you'll get a new workspace + token pair. Update your
MCP config and restart your runtime.
### `Workspace <id> was deleted on the platform...` from `get_workspace_info`
Since [#2429](https://github.com/Molecule-AI/molecule-core/pull/2449),
`GET /workspaces/:id` returns **410 Gone** (not 200 + `status:"removed"`)
when the workspace has been deleted. The MCP wheel's `get_workspace_info`
tool surfaces this as a tailored error message:
```
Workspace <id> was deleted on the platform at <removed_at>.
Regenerate workspace + token from the canvas → Tokens tab.
```
This is the **startup-time** counterpart to the heartbeat-401 escalation
above. If you see it within seconds of starting your runtime (rather
than after ~60s of heartbeat failures), the workspace was already gone
when you connected — regenerate as instructed.
Audit-trail tools that intentionally want to inspect a removed workspace's
metadata (admin dashboards, "show me deleted workspaces" tooling) can
opt back into the legacy 200 + body shape via
`GET /workspaces/<id>?include_removed=true`.
### `claude mcp list` shows the new config but tools still 401
`/mcp` reconnect re-spawns the **cached** MCP config from session
start, not the latest on-disk config. After editing `claude mcp add`
or your `~/.cursor/mcp.json`, fully exit and relaunch the runtime —
not just `/mcp`.
A quick way to confirm: `ps aux | grep molecule-mcp` and check the
PID hasn't changed across `/mcp` reconnects. If the same PID stays
alive, the runtime is still using the old config.
### `command not found: molecule-mcp` from inside the runtime
The runtime's `PATH` may differ from your interactive shell — common
on macOS where `~/Library/Python/3.x/bin` is added to login shells but
not to GUI-launched apps. Use the absolute path in your MCP config:
```bash
which molecule-mcp
# /Users/you/Library/Python/3.13/bin/molecule-mcp
```
Then point `command` at that absolute path in `claude mcp add` /
`.cursor/mcp.json` / `mcp_servers.yaml`.
## When to use this vs. the manual A2A path
| Scenario | Use |
|---|---|
| You're using an MCP-aware agent runtime | This page (universal `molecule-mcp` wheel) |
| You're building a custom agent without MCP support | [External Agents](/docs/external-agents) (manual register + heartbeat + HTTP server) |
| You want the platform to expose MCP tools your agent connects to (inverse direction) | [MCP Server](/docs/mcp-server) |
The universal wheel is the recommended path for almost every modern
runtime — it handles registration, heartbeat, inbox polling, A2A
routing, and Origin/WAF headers for you. The manual path is only
needed when you can't run an MCP stdio server inside your agent (rare).
## See also
- [External Agents](/docs/external-agents) — manual A2A path for non-MCP runtimes
- [Tokens](/docs/tokens) — token management and rotation
- [Concepts — Workspaces](/docs/concepts#workspaces)
- [API Reference](/docs/api-reference) — raw HTTP endpoints behind the wheel