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feat: official ObjectStack plugin for Claude Code
One plugin for every deployment (objectstack-ai/objectstack#2713): the deployment URL is the only per-environment input; identity is OAuth 2.1 self-serve (every deployment is its own authorization server with DCR). - .mcp.json: MCP server bound to ${OBJECTSTACK_MCP_URL} - skills/objectstack/SKILL.md: the portable agent skill, rendered verbatim from @objectstack/mcp renderSkillMarkdown() (single source, ADR-0036 Amendment C) — CI fails on drift, re-render with npm run sync:skill - commands/connect.md: /objectstack:connect guided setup incl. multi-env server naming and the x-api-key headless fallback - marketplace.json: the repo doubles as its own marketplace (claude plugin marketplace add objectstack-ai/claude-plugin) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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‎.claude-plugin/marketplace.json‎

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{
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"name": "objectstack",
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"owner": { "name": "ObjectStack", "url": "https://objectstack.ai" },
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"plugins": [
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{
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"name": "objectstack",
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"source": "./",
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"description": "Connect Claude Code to any ObjectStack deployment over MCP (OAuth self-serve). One plugin for every deployment — set OBJECTSTACK_MCP_URL or run /objectstack:connect."
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}
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]
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}

‎.claude-plugin/plugin.json‎

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{
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"name": "objectstack",
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"version": "0.1.0",
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"description": "Connect Claude Code to any ObjectStack deployment over MCP: discover objects, query and change records, and run business actions — under your own permissions and row-level security. OAuth self-serve; the deployment URL is the only input.",
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"author": { "name": "ObjectStack", "url": "https://objectstack.ai" },
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"homepage": "https://github.com/objectstack-ai/claude-plugin",
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"repository": "https://github.com/objectstack-ai/claude-plugin",
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"license": "Apache-2.0",
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"keywords": ["objectstack", "mcp", "low-code", "crm", "data", "actions"]
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}

‎.github/workflows/skill-drift.yml‎

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name: skill-drift
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on:
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push:
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branches: [main]
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pull_request:
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schedule:
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- cron: '17 6 * * 1' # weekly: catch upstream skill changes between pushes
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jobs:
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check:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- uses: actions/setup-node@v4
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with:
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node-version: 22
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- run: npm i --no-audit --no-fund @objectstack/mcp@latest
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- run: node scripts/check-skill-drift.mjs

‎.gitignore‎

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node_modules/
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package-lock.json

‎.mcp.json‎

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{
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"mcpServers": {
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"objectstack": {
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"type": "http",
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"url": "${OBJECTSTACK_MCP_URL}"
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}
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}
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}

‎LICENSE‎

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Apache License
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‎README.md‎

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# ObjectStack plugin for Claude Code
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Connect Claude Code to **any ObjectStack deployment** — cloud or self-hosted — over the
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Model Context Protocol. Discover objects, query and change records, and run business
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actions, all under **your own permissions and row-level security**.
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One plugin serves every deployment: the deployment URL is the only per-environment
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input. Identity is self-serve — every ObjectStack deployment is its own OAuth 2.1
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authorization server with Dynamic Client Registration, so connecting just opens a
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browser login. No admin-minted credentials, nothing to paste into config files.
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## Install
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```bash
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claude plugin marketplace add objectstack-ai/claude-plugin
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claude plugin install objectstack@objectstack
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```
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## Connect
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**Guided (recommended):** run `/objectstack:connect` and follow along — it asks for
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your deployment URL, registers the MCP server, and verifies the connection. Find your
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URL on your deployment's **Setup → Connect an agent** page, or just use the address
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you open in the browser.
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**One-liner:**
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```bash
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claude mcp add --transport http objectstack https://<your-deployment>/api/v1/mcp
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```
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**Fixed environment via env var:** the plugin ships an MCP server bound to
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`${OBJECTSTACK_MCP_URL}` — set it once (shell profile or project `.claude/settings.json`
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`env`) and the server is live without any `claude mcp add`:
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```bash
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export OBJECTSTACK_MCP_URL="https://acme.objectos.app/api/v1/mcp"
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```
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**Headless (CI, machine accounts):** use an ObjectStack API key instead of OAuth:
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```bash
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claude mcp add --transport http objectstack https://<your-deployment>/api/v1/mcp \
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--header "x-api-key: <key>"
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```
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## What's inside
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| Piece | Purpose |
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| --- | --- |
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| `skills/objectstack/SKILL.md` | The portable ObjectStack agent skill: teaches discover-first workflow (`list_objects` → `describe_object` → act), the full tool surface incl. business actions (`list_actions`/`run_action`), and governance conventions (permissions/RLS are expected behavior, prefer actions over hand-edits, confirm destructive steps) |
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| `.mcp.json` | MCP server bound to `${OBJECTSTACK_MCP_URL}` |
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| `commands/connect.md` | `/objectstack:connect` guided setup |
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The skill enumerates **no schema** — objects and actions are discovered live from your
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deployment, so one install keeps working as your apps evolve, and works against every
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environment your account can reach.
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## Notes
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- Requires the deployment's MCP surface, which is **on by default** (ObjectStack ≥ 13);
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an operator can opt out with `OS_MCP_SERVER_ENABLED=false`.
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- Intranet deployments work from local clients like Claude Code (OAuth 2.1 TLS rule:
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https required, loopback exempt — internal CAs are fine if your OS trusts them).
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- `SKILL.md` is a copy of the single source in
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[`@objectstack/mcp`](https://www.npmjs.com/package/@objectstack/mcp)
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(`renderSkillMarkdown()`); CI fails on drift. Re-render with `npm run sync:skill` —
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never hand-edit.
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## License
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Apache-2.0 — see [LICENSE](LICENSE).

‎commands/connect.md‎

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---
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description: Connect this workspace to an ObjectStack deployment over MCP (guided)
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argument-hint: "[deployment URL, e.g. https://acme.objectos.app]"
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---
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Connect the user to an ObjectStack deployment over MCP. Follow these steps exactly:
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1. **Determine the MCP URL.**
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- If the user provided an argument, use it: `$ARGUMENTS`.
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- Otherwise ask for their deployment URL (the address they open in the browser, e.g. `https://acme.objectos.app` or an intranet host). Their admin can also find the exact MCP URL on the Setup → "Connect an agent" page.
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- Normalize: if the URL does not already end in `/api/v1/mcp`, append `/api/v1/mcp`. Keep the scheme as given (intranet deployments may be `http://` on a loopback/dev host).
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2. **Pick a server name.** Default to `objectstack`; if the user already has a server with that name (check with `claude mcp list`), derive one from the host (e.g. `objectstack-acme`) so multiple environments can coexist.
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3. **Add the server.** Run:
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```
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claude mcp add --transport http <name> <url>
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```
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ObjectStack deployments are their own OAuth 2.1 authorization servers with Dynamic Client Registration — no credentials belong in this config. On first use, the client opens a browser login; the user signs in as themselves and every tool call runs under their own permissions and row-level security.
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4. **Headless fallback (only if the user asks, e.g. for CI or a machine account).** An ObjectStack API key can be sent as a header instead:
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```
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claude mcp add --transport http <name> <url> --header "x-api-key: <key>"
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```
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Warn that the key is a password-equivalent and is shown only once at creation.
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5. **Verify.** Call the server's `list_objects` tool once. If it returns objects, tell the user they're connected and mention the `objectstack` skill now guides data work. If it returns 401, the OAuth login likely wasn't completed — ask them to retry the tool call and finish the browser login. If the URL is unreachable, confirm the deployment is running and the MCP surface isn't disabled (`OS_MCP_SERVER_ENABLED=false`).

‎package.json‎

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{
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"name": "objectstack-claude-plugin",
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"private": true,
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"type": "module",
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"scripts": {
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"check:skill-drift": "node scripts/check-skill-drift.mjs",
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"sync:skill": "node scripts/check-skill-drift.mjs --write"
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},
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"devDependencies": {
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"@objectstack/mcp": "latest"
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}
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}

‎scripts/check-skill-drift.mjs‎

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// Drift guard: skills/objectstack/SKILL.md is a COPY — the single source is
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// renderSkillMarkdown() in @objectstack/mcp (framework repo, ADR-0036
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// Amendment C). This script fails when the copy no longer matches the latest
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// published renderer output. Fix by re-rendering, never by hand-editing:
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// npm i @objectstack/mcp@latest && node scripts/check-skill-drift.mjs --write
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import { renderSkillMarkdown } from '@objectstack/mcp';
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import { readFileSync, writeFileSync } from 'node:fs';
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const path = new URL('../skills/objectstack/SKILL.md', import.meta.url);
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const expected = renderSkillMarkdown();
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if (process.argv.includes('--write')) {
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writeFileSync(path, expected);
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console.log('SKILL.md re-rendered from @objectstack/mcp');
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process.exit(0);
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}
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const actual = readFileSync(path, 'utf8');
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if (actual !== expected) {
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console.error('DRIFT: skills/objectstack/SKILL.md no longer matches renderSkillMarkdown() from @objectstack/mcp@latest.');
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console.error('Run: npm i @objectstack/mcp@latest && node scripts/check-skill-drift.mjs --write');
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process.exit(1);
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}
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console.log('SKILL.md matches @objectstack/mcp renderSkillMarkdown()');

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