docs(site): opencode MCP bridge integration page (#800)

Pairs with monorepo PRs #840 (opencode MCP bridge) and #842 (org-template +
integration guide). Adds opencode.mdx with prerequisites, opencode.json config,
token issuance, available tools, transport options, and SAFE-T1401/T1201
security notes. Adds ---Integrations--- nav section to meta.json.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Molecule AI · documentation-specialist 2026-04-17 23:36:10 +00:00
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"troubleshooting",
"---Runtimes---",
"google-adk",
"hermes"
"hermes",
"---Integrations---",
"opencode"
]
}

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---
title: opencode Integration
description: Use opencode as an AI coding agent connected to your Molecule AI workspace via remote MCP.
---
## Overview
[opencode](https://opencode.ai) is an AI coding agent that supports remote MCP
servers via `opencode.json`. With Molecule AI's MCP bridge you can wire opencode
directly to your workspace — giving it the full A2A tool surface
(`delegate_task`, `list_peers`, `recall_memory`, and more) over a standard
`Authorization: Bearer` connection.
```
opencode (terminal)
↕ opencode.json declares remote MCP
Molecule AI MCP endpoint
↕ WorkspaceAuth middleware
Your workspace agent
```
---
## Prerequisites
- A running Molecule AI platform (`MOLECULE_MCP_URL` — e.g. `https://api.molecule.ai`)
- A workspace-scoped bearer token (`MOLECULE_MCP_TOKEN`) issued via the platform API (see [Token Management](/docs/tokens))
---
## 1. Declare Molecule as a remote MCP server
Create (or extend) `opencode.json` in your project root:
```json
{
"mcpServers": {
"molecule": {
"type": "remote",
"url": "${MOLECULE_MCP_URL}/workspaces/${WORKSPACE_ID}/mcp",
"headers": { "Authorization": "Bearer ${MOLECULE_MCP_TOKEN}" },
"description": "Molecule AI A2A orchestration — delegate_task, list_peers, check_task_status"
}
}
}
```
> ⚠️ **Never embed the token in the URL** (e.g. `?token=…`). Always use the
> `Authorization: Bearer` header — URL-embedded tokens appear in server logs,
> browser history, and Git history if the file is committed.
A pre-configured template is available in
`org-templates/molecule-dev/opencode.json` in the monorepo.
---
## 2. Obtain a workspace-scoped token
```bash
curl -X POST https://$MOLECULE_MCP_URL/workspaces/$WORKSPACE_ID/tokens \
-H "Authorization: Bearer $ADMIN_TOKEN" \
-H "Content-Type: application/json" \
-d '{"name": "opencode-agent", "scopes": ["mcp:read", "mcp:delegate"]}'
```
Store the returned token as `MOLECULE_MCP_TOKEN` in your `.env`.
See [Token Management](/docs/tokens) for rotation, revocation, and auditing.
---
## 3. Available tools
When opencode connects to the Molecule MCP endpoint the agent gains access to:
| Tool | Description |
|------|-------------|
| `list_peers` | Discover available workspaces in your org |
| `delegate_task` | Send a task to a peer workspace and wait for the result |
| `delegate_task_async` | Fire-and-forget task delegation; returns a `task_id` |
| `check_task_status` | Poll an async delegation by `task_id` |
| `commit_memory` | Persist information to `LOCAL` or `TEAM` memory scope |
| `recall_memory` | Search previously committed memories |
### Restricted tools
- **`send_message_to_user`** — disabled for remote MCP callers by default. Enable
with `MOLECULE_MCP_ALLOW_SEND_MESSAGE=true` in your platform env.
- **`GLOBAL` memory scope** — `commit_memory` with `scope: GLOBAL` is blocked for
external agents. `LOCAL` and `TEAM` scopes are always available.
---
## 4. Example: delegate a research task
Once connected, opencode can call Molecule tools directly in its tool loop:
```json
{
"tool": "delegate_task",
"arguments": {
"target": "research-lead",
"task": "Summarise the last 7 days of commits in Molecule-AI/molecule-monorepo"
}
}
```
The platform routes the task to your `research-lead` workspace and streams the
response back to opencode.
---
## 5. Two transports
The MCP endpoint supports two transports — opencode auto-selects:
| Transport | Endpoint | Notes |
|-----------|----------|-------|
| Streamable HTTP (primary) | `POST /workspaces/:id/mcp` | MCP 2024-11-05, recommended |
| SSE (backwards compat) | `GET /workspaces/:id/mcp/stream` | Legacy clients |
---
## 6. Security notes
### Org topology exposure (SAFE-T1401)
`list_peers` returns the full set of workspace names and roles visible to your
workspace. Any opencode agent with a valid `MOLECULE_MCP_TOKEN` can enumerate
your org topology. Issue tokens to only the workspaces that need peer visibility.
### Tool surface audit (SAFE-T1201)
The full `@molecule-ai/mcp-server` package exposes additional tools beyond those
listed above. A complete SAFE-T1201 audit is in progress. **Until that audit
completes, do not expose the MCP server to untrusted external agents in
production.**
### Token scoping
Issue tokens with the minimum required scopes (`mcp:read`, `mcp:delegate`).
Rotate tokens regularly. Revoke via `DELETE /workspaces/:id/tokens/:token_id`.
---
## 7. Environment variables
Add to your `.env`:
```bash
MOLECULE_MCP_URL=https://api.molecule.ai # or http://localhost:8080 for local dev
MOLECULE_MCP_TOKEN= # workspace-scoped bearer token (step 2)
WORKSPACE_ID= # UUID of the workspace opencode acts as
# find it in the Canvas sidebar or GET /workspaces
```
See `.env.example` in the monorepo for the full canonical reference.
---
## Related
- [MCP Server](/docs/mcp-server) — full tool catalogue for the `@molecule-ai/mcp-server` package
- [Token Management](/docs/tokens) — issue, rotate, and revoke workspace tokens
- [External Agents](/docs/external-agents) — register any HTTP agent as a first-class workspace