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Supervised action bridge between Claude Code and the host system.
Server accepts structured action requests, applies per-action policies
(auto-accept/auto-deny/queue), and executes approved actions via typed
handlers. Client provides CLI and module interfaces for calling the API.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
mikael-lovqvists-claude-agent
2026-03-07 20:01:54 +00:00
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node_modules/

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# claude-code-conduit
A supervised action bridge between Claude Code and the host system.
Claude requests structured actions. The server applies per-action policies:
- **auto-accept** — executed immediately (e.g. open a file in editor)
- **auto-deny** — rejected immediately
- **queue** — held for user approval (e.g. open a browser URL)
## Setup
```bash
npm install
```
## Running the server
```bash
node server/index.js
# or
CONDUIT_PORT=3333 CONDUIT_ROOT=/workspace node server/index.js
```
## Using the CLI client
```bash
# List available actions
node client/index.js list-actions
# Open a file in the editor (auto-accepted)
node client/index.js edit-file filename=/workspace/myfile.js
# Open a URL (queued for user approval)
node client/index.js open-browser url=https://example.com
```
When a queued action is submitted, the server prints the approve/deny URLs to stdout:
```
[QUEUE] New request #a1b2c3d4
Action: open-browser
Params: {"url":"https://example.com"}
Approve: POST /queue/a1b2c3d4.../approve
Deny: POST /queue/a1b2c3d4.../deny
```
User approves via:
```bash
curl -X POST http://localhost:3333/queue/<id>/approve
```
## Environment variables
| Variable | Default | Description |
|----------|---------|-------------|
| `CONDUIT_PORT` | `3333` | Server port |
| `CONDUIT_ROOT` | `/workspace` | Workspace root for path resolution |
| `CONDUIT_URL` | `http://localhost:3333` | Server URL (client-side) |
## Adding actions
Edit `server/actions.js`. Each action needs:
- `description` — shown in list-actions
- `params` — array of `{ name, required, type }`
- `policy` — `"auto-accept"` | `"auto-deny"` | `"queue"`
- `handler(params, helpers)` — async function that performs the action

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// Conduit client module — import this when using conduit programmatically.
// Designed for use by Claude or other tools that want to call conduit actions.
const BASE_URL = process.env.CONDUIT_URL || "http://localhost:3333";
export async function callAction(action, params = {}) {
const res = await fetch(`${BASE_URL}/action`, {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ action, ...params }),
});
return res.json();
}
export async function listActions() {
return callAction("list-actions");
}
export async function getQueue() {
const res = await fetch(`${BASE_URL}/queue`);
return res.json();
}

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#!/usr/bin/env node
// Conduit client — thin CLI wrapper for Claude to call the conduit server.
// Usage:
// node client/index.js <action> [key=value ...]
// node client/index.js list-actions
// node client/index.js edit-file filename=/workspace/foo.js
const BASE_URL = process.env.CONDUIT_URL || "http://localhost:3333";
async function callAction(action, params = {}) {
const res = await fetch(`${BASE_URL}/action`, {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ action, ...params }),
});
const body = await res.json();
return { status: res.status, body };
}
function parseArgs(argv) {
const [, , action, ...rest] = argv;
const params = {};
for (const arg of rest) {
const eq = arg.indexOf("=");
if (eq === -1) {
console.error(`Bad argument (expected key=value): ${arg}`);
process.exit(1);
}
params[arg.slice(0, eq)] = arg.slice(eq + 1);
}
return { action, params };
}
async function main() {
if (process.argv.length < 3) {
console.error("Usage: conduit <action> [key=value ...]");
process.exit(1);
}
const { action, params } = parseArgs(process.argv);
const { status, body } = await callAction(action, params);
console.log(JSON.stringify(body, null, 2));
process.exit(status >= 400 ? 1 : 0);
}
main().catch((err) => {
console.error("Conduit error:", err.message);
process.exit(1);
});

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}

13
package.json Normal file
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@@ -0,0 +1,13 @@
{
"name": "claude-code-conduit",
"version": "0.1.0",
"description": "A supervised action bridge between Claude Code and the host system",
"type": "module",
"scripts": {
"server": "node server/index.js",
"client": "node client/index.js"
},
"dependencies": {
"express": "^5.2.1"
}
}

61
server/actions.js Normal file
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// Action registry — defines all available actions, their parameters, and policies.
// policy: "auto-accept" | "auto-deny" | "queue"
export const actions = {
"list-actions": {
description: "List all available actions and their definitions",
params: [],
policy: "auto-accept",
handler: async () => {
return Object.entries(actions).map(([name, def]) => ({
action: name,
description: def.description,
params: def.params,
policy: def.policy,
}));
},
},
"edit-file": {
description: "Open a file in the editor",
params: [{ name: "filename", required: true, type: "path" }],
policy: "auto-accept",
handler: async ({ filename }, { resolvePath, exec }) => {
const resolved = resolvePath(filename);
await exec("xdg-open", [resolved]);
return { opened: resolved };
},
},
"open-directory": {
description: "Open a directory in the file manager",
params: [{ name: "path", required: true, type: "path" }],
policy: "auto-accept",
handler: async ({ path }, { resolvePath, exec }) => {
const resolved = resolvePath(path);
await exec("xdg-open", [resolved]);
return { opened: resolved };
},
},
"open-browser": {
description: "Open a URL in the web browser",
params: [{ name: "url", required: true, type: "string" }],
policy: "queue",
handler: async ({ url }, { exec }) => {
await exec("xdg-open", [url]);
return { opened: url };
},
},
"open-terminal": {
description: "Open a terminal in a given directory",
params: [{ name: "path", required: false, type: "path" }],
policy: "queue",
handler: async ({ path }, { resolvePath, exec }) => {
const resolved = path ? resolvePath(path) : process.env.HOME;
await exec("xdg-open", [resolved]);
return { opened: resolved };
},
},
};

127
server/index.js Normal file
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@@ -0,0 +1,127 @@
import express from "express";
import { spawnSync } from "child_process";
import path from "path";
import { actions } from "./actions.js";
import { enqueue, getEntry, listPending, resolve } from "./queue.js";
const PORT = process.env.CONDUIT_PORT || 3015;
const WORKSPACE_ROOT = process.env.CONDUIT_ROOT || "/workspace";
const app = express();
app.use(express.json());
// Resolve a path param relative to WORKSPACE_ROOT, preventing traversal.
function resolvePath(userPath) {
const resolved = path.resolve(WORKSPACE_ROOT, userPath.replace(/^\//, ""));
if (!resolved.startsWith(WORKSPACE_ROOT)) {
throw new Error(`Path escapes workspace root: ${userPath}`);
}
return resolved;
}
// Execute a binary with an argument list — no shell interpolation.
function exec(bin, args = []) {
return new Promise((resolve, reject) => {
const result = spawnSync(bin, args, { stdio: "inherit" });
if (result.error) {
reject(result.error);
} else {
resolve(result.status);
}
});
}
const helpers = { resolvePath, exec };
// Validate that all required params are present.
function validateParams(actionDef, params) {
const errors = [];
for (const p of actionDef.params) {
if (p.required && (params[p.name] === undefined || params[p.name] === null)) {
errors.push(`Missing required param: ${p.name}`);
}
}
return errors;
}
// POST /action — main entry point
app.post("/action", async (req, res) => {
const { action, ...params } = req.body ?? {};
if (!action) {
return res.status(400).json({ error: "Missing 'action' field" });
}
const def = actions[action];
if (!def) {
return res.status(404).json({ error: `Unknown action: ${action}` });
}
const errors = validateParams(def, params);
if (errors.length) {
return res.status(400).json({ error: "Invalid params", details: errors });
}
if (def.policy === "auto-deny") {
return res.status(403).json({ status: "denied", reason: "Policy: auto-deny" });
}
if (def.policy === "auto-accept") {
try {
const result = await def.handler(params, helpers);
return res.json({ status: "accepted", result });
} catch (err) {
return res.status(500).json({ status: "error", error: err.message });
}
}
if (def.policy === "queue") {
const id = enqueue(action, params);
return res.status(202).json({ status: "queued", id });
}
});
// GET /queue — list pending items
app.get("/queue", (req, res) => {
res.json(listPending());
});
// POST /queue/:id/approve — user approves a queued action
app.post("/queue/:id/approve", async (req, res) => {
const entry = getEntry(req.params.id);
if (!entry) {
return res.status(404).json({ error: "Not found" });
}
if (entry.status !== "pending") {
return res.status(409).json({ error: "Already resolved" });
}
resolve(req.params.id, "approved");
const def = actions[entry.action];
try {
const result = await def.handler(entry.params, helpers);
res.json({ status: "approved", result });
} catch (err) {
res.status(500).json({ status: "error", error: err.message });
}
});
// POST /queue/:id/deny — user denies a queued action
app.post("/queue/:id/deny", (req, res) => {
const entry = getEntry(req.params.id);
if (!entry) {
return res.status(404).json({ error: "Not found" });
}
if (entry.status !== "pending") {
return res.status(409).json({ error: "Already resolved" });
}
resolve(req.params.id, "denied");
res.json({ status: "denied" });
});
app.listen(PORT, () => {
console.log(`claude-code-conduit server running on port ${PORT}`);
console.log(`Workspace root: ${WORKSPACE_ROOT}`);
});

41
server/queue.js Normal file
View File

@@ -0,0 +1,41 @@
// Pending queue — holds actions awaiting user approval.
import { randomUUID } from "crypto";
const pending = new Map();
export function enqueue(action, params) {
const id = randomUUID();
const entry = {
id,
action,
params,
status: "pending",
createdAt: new Date().toISOString(),
};
pending.set(id, entry);
console.log(`\n[QUEUE] New request #${id.slice(0, 8)}`);
console.log(` Action: ${action}`);
console.log(` Params: ${JSON.stringify(params)}`);
console.log(` Approve: POST /queue/${id}/approve`);
console.log(` Deny: POST /queue/${id}/deny\n`);
return id;
}
export function getEntry(id) {
return pending.get(id) ?? null;
}
export function listPending() {
return [...pending.values()].filter((e) => e.status === "pending");
}
export function resolve(id, decision) {
const entry = pending.get(id);
if (!entry) {
return null;
}
entry.status = decision; // "approved" | "denied"
entry.resolvedAt = new Date().toISOString();
return entry;
}