Golem CLI: add mcp server by BenraouaneSoufiane · Pull Request #1976 · golemcloud/golem

BenraouaneSoufiane · 2025-08-20T09:27:36Z

Add MCP Server Mode to `golem-cli`

Summary of Changes

This PR introduces an MCP (Model Context Protocol) server mode to golem-cli, allowing external tools (e.g. IDEs, LLMs, or orchestrators) to interact with golem via a standardized JSON-RPC 2.0 API over HTTP.

🔨 Implementation Details

Added --serve and --serve-port flags to launch golem-cli as an MCP server.
Confirmed successful release build with no warnings.

📡 MCP Endpoints Implemented

initialize — handshake and capability negotiation.
tools/list — exposes available CLI tools (golem.run).
tools/call — runs commands like golem version or golem profile list, with:
- Streaming of stdout / stderr into logs array.
- exitCode and final output in structured JSON.
- Safety check: blocks disallowed top-level subcommands (e.g. system, exec).
resources/list — enumerates manifest files in current dir, ancestors, and immediate children.
resources/read — returns file contents by file:// URI.

🔬 Validation / Testing

A test plan was executed using curl against the MCP endpoint:

initialize returns protocol version & capabilities.
tools/list shows golem.run.
tools/call:
- ✅ Happy path (golem version) returns logs + result.
- ✅ Error path blocks disallowed commands (system exec).
- ✅ Supports cwd argument for working directory override.
resources/list returns expected manifests.
resources/read fetches file contents.
Verified error handling for:
- Unknown methods (-32601).
- Wrong tool name (-32602).
- Invalid URIs (clear error message).

🏁 Result

golem-cli can now be run as a long-lived MCP server:

./target/release/golem-cli --serve --serve-port 1232

▶️ Live demo

https://youtu.be/BxJBLJkkV8Q

🤔 How to

1- Build/compile:

cd golem/cli/golem-cli
cargo build --release

2- Run:

cd ../..
RUST_LOG=debug ./target/release/golem-cli --serve --serve-port 1232

Expected:

INFO golem_cli::serve: golem-cli: MCP HTTP server listening on http://127.0.0.1:1232

Then (if using) VSCode port forwading pop up

3- Test first request in other terminal run:

curl -sS http://127.0.0.1:1232/mcp   -H 'content-type: application/json'   -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}' | jq

Expected:

{ "jsonrpc": "2.0", "id": 1, "result": { "protocolVersion": "...", "serverInfo": {"..."}, "capabilities": {"..."} } }

See full implimented/available commands: https://github.com/BenraouaneSoufiane/golem/tree/mcp-server/cli/golem-cli

Algora.io

/claim #1926

BenraouaneSoufiane · 2025-08-20T11:07:56Z

@vigoo Hello, can you take a look if not busy

BenraouaneSoufiane · 2025-09-04T05:44:12Z

@jdegoes Any updates?

BenraouaneSoufiane · 2025-09-11T21:18:03Z

Hello @vigoo @noise64 can someone review my PR?

BenraouaneSoufiane · 2025-09-17T14:38:33Z

@vigoo Any updates on this?

BenraouaneSoufiane · 2025-09-17T18:40:36Z

Hello @mschuwalow can you review this?

noise64 · 2025-09-17T19:02:37Z

This PR is obviously AI generated for many parts, which is not a problem, but it is not cleaned up at all or reviewed properly before it was submitted, which is a problem, some examples:

the hooks / golem server feature got deleted, why? "Keep it empty to avoid trait lifetime churn."? what does this mean?
it randomly reimplements a sloppy version of command line parsing, that should be properly integrated with clap, or like how it is done for fallback parsing in the repo
droped the real main entry point of the app (or at least the tokio runtime parts...)
the allowed_subcommands are not even matching the real commands available, ideally this should be derived from clap meta, and then have a disallow list
the "discover manifest" randomly reimplements how manifest should be discovered and how it is done in other parts of the app
the server should not use hardcoded json literals, it should have a clean model
random comments in cargo.toml

and so on.

Even the description / implementation "details" in the PR description are making no sense:

Implemented main_async to replace duplicate main definitions (fixing fn main duplication errors).
Fixed ownership/move issues in serve.rs by restructuring mpsc::UnboundedReceiver and logs handling.
Cleaned up compiler warnings (unused_mut, dead_code).

…registry - Gate the HTTP server behind the `mcp-server` Cargo feature - Add graceful error when `--serve` is used without the feature - Keep server code isolated in `serve.rs` behind cfg(feature = "mcp-server") - Implement clean JSON-RPC response model (`RpcResponse`, `RpcError`) instead of raw literals - Wire `tools/list` directly to the central registry of tools - Restrict `tools/call` to only allowed/registered tools with typed input schema - Align manifest discovery with repo’s canonical algorithm (`golem.yaml` walk-up)

BenraouaneSoufiane · 2025-09-24T13:58:47Z

Hello again @noise64
I've tried to resolve mentioned issues.

BenraouaneSoufiane · 2025-09-24T15:48:24Z

Hello again @vigoo can you take a look at this???

BenraouaneSoufiane · 2025-09-26T14:29:00Z

Hello @mschuwalow @afsalthaj can someone provide feedbacks on this?

BenraouaneSoufiane · 2025-10-03T17:15:14Z

Hello again @noise64 @vigoo @mschuwalow, any updates on this?

BenraouaneSoufiane · 2025-10-06T13:30:39Z

@vigoo any updates on this?

BenraouaneSoufiane · 2025-10-08T16:05:38Z

@noise64 I know you're busy, I've tried to fix mentioned issues, can you take a look?

BenraouaneSoufiane · 2025-10-11T11:04:49Z

@mschuwalow can you review this?

BenraouaneSoufiane · 2025-10-11T14:31:11Z

@afsalthaj can you review this?

BenraouaneSoufiane · 2025-10-14T20:18:24Z

@noise64 I think the body/description looks good now.

BenraouaneSoufiane · 2025-10-15T05:07:31Z

Can someone approve the workflows?

noise64 · 2025-10-16T07:34:26Z

This is still full of random unreviewed AI generated things, and most of the things were not corrected or done properly.
Please stop pinging us with this.
I'm closing this PR now.

BenraouaneSoufiane · 2025-10-16T07:42:25Z

This is still full of random unreviewed AI generated things, and most of the things were not corrected or done properly. Please stop pinging us with this. I'm closing this PR now.

I've tried to built it locally & works fine.

root and others added 5 commits August 20, 2025 00:10

Basic MCP template/flag

2f09b6a

Merge branch 'golemcloud:main' into mcp-server

7dff0df

Merge branch 'golemcloud:main' into mcp-server

9120deb

Add basic intro/usage

de301aa

Move README.md to the right directory

fd52700

algora-pbc bot added the 🙋 Bounty claim label Aug 20, 2025

root added 2 commits August 21, 2025 14:47

Reformat README.md

b750126

Reform README.md

9194dc3

Benraouane Soufiane and others added 5 commits September 18, 2025 06:35

Merge branch 'main' into mcp-server

9f707bb

Merge branch 'main' into mcp-server

197bbd5

Merge branch 'main' into mcp-server

4f0234b

Merge branch 'main' into mcp-server

3d16e3a

Merge branch 'main' into mcp-server

ecddbfa

Merge branch 'golemcloud:main' into mcp-server

7dbb6f6

Merge branch 'main' into mcp-server

aa21ee8

Merge branch 'main' into mcp-server

614816d

Merge branch 'main' into mcp-server

56f89d0

Merge branch 'main' into mcp-server

8bf4a03

Merge branch 'main' into mcp-server

8c29ff1

noise64 closed this Oct 16, 2025

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Add MCP Server Mode to golem-cli

Summary of Changes

🔨 Implementation Details

📡 MCP Endpoints Implemented

🔬 Validation / Testing

🏁 Result

▶️ Live demo

🤔 How to

Algora.io

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BenraouaneSoufiane commented Aug 20, 2025 •

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Add MCP Server Mode to `golem-cli`

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