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* fix(mcp): bound OAuth discovery/DCR/token fetches with a timeout The MCP SDK issues OAuth discovery, dynamic client registration, and token exchange with a bare fetch and no AbortSignal (only the JSON-RPC layer gets the SDK's request timeout), and undici's default headers/body timeouts are 5 min. A slow or unresponsive authorization server therefore left /oauth/start pending for minutes — the browser stuck on "Connecting…" forever. Bound each guarded OAuth/revocation leg with a 30s AbortSignal.timeout, composed with any caller signal so cancellation still works. Only our own deadline is relabeled to an McpError; caller aborts and other failures propagate unchanged. Scoped to createSsrfGuardedMcpFetch (OAuth/revoke/probe) — the live transport's timeouts are untouched. * fix(mcp): bound SSRF/DNS validation by the deadline too Move the timeout signal ahead of validateMcpServerSsrf and race the validation (whose dns.lookup takes no signal) against it, so the deadline covers the whole guarded call — a stalled DNS resolution now rejects at timeoutMs instead of the OS DNS timeout. Listener is cleaned up on settle so a late timeout can't surface as an unhandled rejection. * fix(mcp): compose caller signal before validation + attribute timeout by reason Compose the caller's AbortSignal with the deadline up front and use the combined signal for both SSRF validation and the HTTP request, so caller cancellation now covers the whole guarded call (previously a caller abort during a stalled DNS validation waited for the full deadline). Attribute the timeout relabel by the rejection reason's identity rather than init.signal's state, so a caller signal that aborts just after the deadline can't misattribute a genuine timeout. * fix(mcp): adopt in-flight validation on early abort to avoid unhandled rejection When raceWithSignal is entered with an already-aborted signal it returned without attaching to the in-flight validateMcpServerSsrf promise, so a later SSRF/DNS rejection could surface as an unhandled rejection. Swallow the orphaned promise's settlement in the early-abort branch. * test(mcp): use sleep() instead of raw setTimeout in pinned-fetch test check:utils bans new Promise(resolve => setTimeout(...)) in favor of sleep() from @sim/utils/helpers.
A workspace to build, deploy and manage AI agents and workflows.
Quickstart
Cloud-hosted: sim.ai
Self-hosted
npx simstudio
Docker must be installed and running. Use -p, --port <port> to run Sim on a different port, or --no-pull to skip pulling the latest Docker images.
Capabilities
- Connect 1,000+ integrations and every major LLM
- Add Slack, Notion, HubSpot, Salesforce, databases, and more
- Build agents visually, conversationally, or with code
- Ingest files, knowledge bases, and structured table data
- Monitor runs, logs, schedules, and workflow activity
One workspace, every surface
Chat and workflows are just the start — tables, files, knowledge, and scheduled tasks all live in the same workspace.
Tables — a database, built in |
Files — one store for your team and every agent |
Knowledge — your agents' memory |
Scheduled tasks — runs on your schedule |
Self-hosting
Docker Compose
git clone https://github.com/simstudioai/sim.git && cd sim
docker compose -f docker-compose.prod.yml up -d
Sim also supports local models via Ollama and vLLM. See the Docker self-hosting docs for setup details.
Manual Setup
Requirements: Bun, Node.js v20+, PostgreSQL 12+ with pgvector
- Clone and install:
git clone https://github.com/simstudioai/sim.git
cd sim
bun install
bun run prepare # Set up pre-commit hooks
- Set up PostgreSQL with pgvector:
docker run --name simstudio-db -e POSTGRES_PASSWORD=your_password -e POSTGRES_DB=simstudio -p 5432:5432 -d pgvector/pgvector:pg17
Or install manually via the pgvector guide.
- Configure environment:
cp apps/sim/.env.example apps/sim/.env
# Create your secrets
perl -i -pe "s/your_encryption_key/$(openssl rand -hex 32)/" apps/sim/.env
perl -i -pe "s/your_internal_api_secret/$(openssl rand -hex 32)/" apps/sim/.env
perl -i -pe "s/your_api_encryption_key/$(openssl rand -hex 32)/" apps/sim/.env
# DB configs for migration
cp packages/db/.env.example packages/db/.env
# Edit both .env files to set DATABASE_URL="postgresql://postgres:your_password@localhost:5432/simstudio"
- Run migrations:
cd packages/db && bun run db:migrate
- Start development servers:
bun run dev:full # Starts Next.js app and realtime socket server
Or run separately: bun run dev (Next.js) and cd apps/sim && bun run dev:sockets (realtime).
Chat API Keys
Chat is a Sim-managed service. To use Chat on a self-hosted instance:
- Go to https://sim.ai → Settings → Chat keys and generate a Chat API key
- Set
COPILOT_API_KEYenvironment variable in your self-hosted apps/sim/.env file to that value
Environment Variables
See the environment variables reference for the full list, or apps/sim/.env.example for defaults.
Tech Stack
Next.js · Bun · PostgreSQL · Drizzle · Better Auth · Tailwind — and the rest of the stack
- Framework: Next.js (App Router)
- Runtime: Bun
- Database: PostgreSQL with Drizzle ORM
- Authentication: Better Auth
- Schema Validation: Zod
- UI: Shadcn, Tailwind CSS
- Streaming Markdown: Streamdown
- State Management: Zustand, TanStack Query
- Flow Editor: ReactFlow
- Docs: Fumadocs
- Monorepo: Turborepo
- Realtime: Socket.io
- Background Jobs: Trigger.dev
- Remote Code Execution: E2B
- Isolated Code Execution: isolated-vm
Contributing
We welcome contributions! Please see our Contributing Guide for details.
License
This project is licensed under the Apache License 2.0 - see the LICENSE file for details.
