Exeris Ai Bridge MCP Server

@exeris/ai-bridge

Model Context Protocol server that gives AI agents the context of an Exeris application: what your build emitted, the SDK's authoring contract, the ADR registry, and a running kernel.

Every tool is a read. The bridge never writes to your project, never calls a model API, and runs as a separate process from the Java kernel. It is built for developers writing an application on Exeris, and works without a checkout of the ecosystem: the reference data it needs ships inside the package.

Installation

Run the server inside your project, so it finds your pom.xml.

Claude Code

claude mcp add exeris -- npx -y @exeris/ai-bridge

Claude Desktop: install exeris-ai-bridge-<version>.mcpb from the GitHub Releases. Desktop does not start the server inside a project, so set Project root in the extension's settings to use the build-* and caps-* tools.

Any other MCP client (Cursor, VS Code, Copilot): the command is npx -y @exeris/ai-bridge over stdio.

{
  "mcpServers": {
    "exeris": { "command": "npx", "args": ["-y", "@exeris/ai-bridge"] }
  }
}

The server is also listed in the MCP Registry as io.github.exeris-systems/ai-bridge.

Requirements

• Node 20 or newer.
• kernel-* only: JDK 25 or newer, and eu.exeris:exeris-kernel-diagnostics-cli in your local Maven repository, which a build of an Exeris application puts there.
• build-preview_generation only: for java, JDK 25 or newer and eu.exeris:exeris-codegen-cli, at the tooling version your project pins, in your local Maven repository; for ts, @exeris/codegen-ts in your project's own node_modules.
• No network at run time. The bridge reads artefacts already in ~/.m2 and never downloads.

Tools

Tool names are family-tool. All 34 are listed in every session; a family whose dependency is missing answers with a structured family_unavailable result naming the reason and the remedy.

docs-list_repos, docs-list_repo_docs and docs-get_repo_doc need a checkout of the Exeris repositories; the other docs-* tools answer from a checkout when there is one, and otherwise from a registry snapshot bundled in the package. lsp-* needs a locally built exeris-platform-lsp, which publishes no runnable jar yet.

Resources

The registry tier of docs-* is also available as MCP resources, all text/markdown, listed in every session. A read goes through the same checkout-or-snapshot resolution and public-scope policy as the tools.

exeris://docs/adr-index can be subscribed to (resources/subscribe): from an exeris-docs checkout the server sends notifications/resources/updated once per burst of changes to the file, including a replacement by rename; from the bundled snapshot the content cannot change, so the subscription is accepted and never fires. Any other URI, exeris://sdk/brief-schema included, is rejected as invalid params.

A URI outside this set, or an ADR number that is not three digits, is rejected as invalid params. An ADR that is not in the registry or has no servable content answers with the MCP resource-not-found error (-32002); docs being unavailable answers with an internal error whose data is the family_unavailable reason and remedy.

Prompts

Nine stateless prompt templates, listed in every session on every transport. A prompt returns messages built from its template and the arguments you give it: the bridge keeps no state, runs no loop and calls no model or tool. Where a step needs a tool, the prompt tells the agent to call it. Context is embedded as resource messages (the exeris://docs/* resources) or as bundled SDK data; where it cannot be embedded, the prompt says which resource to read instead. Arguments are strings, at most 256 characters, except diff (65,536 characters), output (64,000) and area (64, lowercase letters, digits and hyphens).

route-this-task without an ecosystem checkout answers that routing needs one and names a remedy. An unknown prompt, an unknown argument, a missing required argument or one over its bound is rejected as invalid params.

Configuration

Nothing needs setting for an application. Every variable is optional, and none can stop the server from booting.

How each variable resolves, the launch ladder for the Java children, and the bundled reference data are described in the configuration reference.

Troubleshooting

Call bridge-health. It reports every family's state, with the reason and the remedy for each one that is unavailable, without starting any child process. bridge-version reports the build and the upstream releases its bundled data came from. The server also writes a one-line summary (mode=… docs=… lsp=… kernel=… build=… caps=… sdk=…) to stderr, which MCP clients show in their logs.

Versioning

The package follows semver. Until 1.0, a minor release may change a tool's output shape; the release notes list every change a client may notice. At 1.0 the tool names and input schemas are frozen.

The next release targets exeris-kernel 0.12.0, exeris-sdk 0.13.2 and exeris-tooling 0.10.0, all on Maven Central.

Links

• Source
• Roadmap
• Configuration reference
• Contributing
• ADR-025, the founding decision
• Issues

License

Apache-2.0