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Kyle Carberry
27ecd17991
Two MCP code paths both spawned the servers declared in a workspace's `.mcp.json`: the persistent engine in `agent/x/agentmcp` (which owns tool-call execution via `CallTool`) and an ephemeral one-shot runner in `agent/agentcontext` (`mcprunner.go`) that connected, listed tools, and immediately closed each server purely for discovery. Every declared server was launched twice, and the discovery path duplicated the engine's `.mcp.json` parse, transport-build, env-resolve, and connect logic. This makes `agent/x/agentmcp` the single persistent MCP engine. The `agentcontext` manager now reads that engine's per-server catalog in-process through an injected `MCPCatalog` option and surfaces each server as a `KindMCPServer` resource. The engine wires `SetOnReload` to the manager's `Trigger`, so a reload (startup connect or `.mcp.json` edit) re-resolves and re-pushes the pinned resources. Tool-call execution is unchanged: it still flows through the engine's `CallTool` over `POST /api/v0/mcp/call-tool`. The now-dead HTTP discovery surface is removed: the agent `GET /api/v0/mcp/tools` route with `agentmcp.API.handleListTools`, and `workspacesdk.AgentConn.ListMCPTools` with `ListMCPToolsResponse` (mock regenerated). The change nets roughly `-1370` lines, mostly the deleted duplicate runner and its tests. <details> <summary>Decision log</summary> The merge of #26585 made pinned `chat_context_resources` the sole source of workspace context, which surfaced the duplicate spawning. Two options were considered: - **Option A + dependency injection (chosen):** keep `agent/x/agentmcp` as the single persistent engine; `agentcontext` consumes its catalog in-process and stays the orchestrator/owner at the API boundary (it still pushes `KindMCPServer` resources). This is low-risk because `agentcontext` already exposed the `resolver.MCPResources` seam, so the change just rebinds it from the ephemeral runner to the shared engine. - **Option B (rejected):** reimplement persistent pooling, reconnect, singleflight, and race handling inside `agentcontext` and delete `agentmcp`. Too broad, and it discards the engine's tested lifecycle for no behavioral gain. `agentcontext`'s discovery was never what kept servers alive; its runner closed each server immediately after listing tools. The component holding persistent connections was always `agentmcp`, which is why execution already lived there. Consolidating onto it removes the duplicated stack rather than a whole package: both packages survive with distinct roles (`agentmcp` is the engine, `agentcontext` is the orchestrator/owner). </details> Coder Agents generated on behalf of @kylecarbs
Coder is a self-hosted platform for cloud development environments and AI coding agents. Workspaces are defined with Terraform, connected through a secure Wireguard® tunnel, and automatically shut down when not used. Coder Agents runs a native AI coding agent whose loop executes in the control plane on your infrastructure, with no API keys in workspaces.
- Define cloud development environments in Terraform
- EC2 VMs, Kubernetes Pods, Docker Containers, etc.
- Automatically shutdown idle resources to save on costs
- Onboard developers in seconds instead of days
- Delegate coding work to AI agents on your infrastructure
- Bring any model (Anthropic, OpenAI, Google, Bedrock, self-hosted)
- No LLM credentials in workspaces, user identity on every action
- Centralized model governance, cost tracking, and audit logging
Quickstart
The most convenient way to try Coder is to install it on your local machine and experiment with provisioning cloud development environments using Docker (works on Linux, macOS, and Windows).
# First, install Coder
curl -L https://coder.com/install.sh | sh
# Start the Coder server (caches data in ~/.cache/coder)
coder server
# Navigate to http://localhost:3000 to create your initial user,
# create a Docker template and provision a workspace
Install
The easiest way to install Coder is to use the
install script for Linux
and macOS. For Windows, use the latest ..._installer.exe file from GitHub
Releases.
curl -L https://coder.com/install.sh | sh
You can run the install script with --dry-run to see the commands that will be used to install without executing them. Run the install script with --help for additional flags.
See install for additional methods.
Once installed, you can start a production deployment with a single command:
# Automatically sets up an external access URL on *.try.coder.app
coder server
# Requires a PostgreSQL instance (version 13 or higher) and external access URL
coder server --postgres-url <url> --access-url <url>
Use coder --help to get a list of flags and environment variables. See the install guides for a complete tutorial.
Documentation
Browse the documentation or visit a specific section below:
- Workspaces: Workspaces contain the IDEs, dependencies, and configuration information needed for software development
- Templates: Templates are written in Terraform and describe the infrastructure for workspaces
- Coder Agents: Delegate coding work to AI agents running on your self-hosted infrastructure
- Administration: Learn how to operate Coder
- Premium: Learn about paid features built for large teams
- IDEs: Connect your existing editor to a workspace
Support
Feel free to open an issue if you have questions, run into bugs, or have a feature request.
Join our Discord to provide feedback on in-progress features and chat with the community using Coder!
Integrations
New integrations are always in progress. Open an issue to request one. Contributions are welcome in any official or community repository.
Official
- Coder Registry: Templates, modules, and integrations for common development environments
- VS Code Extension: Open any Coder workspace in VS Code with a single click
- JetBrains Toolbox Plugin: Open any Coder workspace from JetBrains Toolbox with a single click
- JetBrains Gateway Plugin: Open any Coder workspace in JetBrains Gateway with a single click
- Dev Containers: Build development environments using
devcontainer.jsonon Docker, Kubernetes, and OpenShift - Kubernetes Log Stream: Stream Kubernetes Pod events to the Coder startup logs
- Self-Hosted VS Code Extension Marketplace: A private extension marketplace that works in restricted or airgapped networks integrating with code-server.
- GitHub Actions: An action to set up the Coder CLI in GitHub workflows
Community
- Community Templates: Community-contributed workspace templates in the Coder Registry
- Community Modules: Community-contributed modules to extend Coder templates
- Provision Coder with Terraform: Provision Coder on Google GKE, Azure AKS, AWS EKS, DigitalOcean DOKS, IBMCloud K8s, OVHCloud K8s, and Scaleway K8s Kapsule with Terraform
- Coder Template GitHub Action: A GitHub Action that updates Coder templates
- Discord: Chat with the community and provide feedback on in-progress features
Contributing
New contributors are always welcome. If you are new to the Coder codebase, see the contribution guide to get started.
Hiring
Apply on the careers page if you are interested in joining the team.