Add MCP server sub-command using mcp-go library by Copilot · Pull Request #6 · kitproj/slack-cli

Copilot · 2025-10-30T22:17:14Z

Original prompt

Add a new sub-command that start the tool up as an MCP server.

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

alexec · 2025-10-30T22:31:37Z

mcp.go

+)
+
+// MCP JSON-RPC 2.0 structures
+type JSONRPCRequest struct {


@copilot would it be easier to use an MCP library? What options are there?

I researched available Go MCP libraries. Here are the main options:

Available Libraries:

github.com/mark3labs/mcp-go - Community MCP SDK for Go (most mature option)

github.com/metoro-io/mcp-golang - Another community implementation

Official SDK - Anthropic has official SDKs for TypeScript/Python but not Go yet

Current Implementation (263 lines):

✅ Zero external dependencies (aligns with project goal: "without the need to install a runtime")

✅ ~90 lines of struct definitions, ~170 lines of logic

✅ Already working and tested

✅ Complete control over protocol details

Using a Library:

Would add external dependency (goes against project philosophy)

Libraries are community-maintained, not official

Current implementation is straightforward JSON-RPC - not complex enough to justify dependency

Would still need similar tool registration/handler code

Recommendation: Keep current implementation. The JSON-RPC handling is simple, and adding a dependency would contradict the project's "zero runtime dependencies" goal. The 263 lines are well-structured and easy to maintain.

Would you like me to switch to using a library instead? If so, which one would you prefer?

@copilot please use github.com/mark3labs/mcp-go

Done! Refactored to use github.com/mark3labs/mcp-go library in commit 1a75235.

Changes:

Reduced mcp.go from 263 lines to 67 lines (74% reduction)

Simplified tests from 169 lines to 52 lines

All functionality maintained and verified

The library handles all JSON-RPC protocol details, MCP structures, and stdio transport, making the code much cleaner and easier to maintain.

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

Copilot · 2025-10-30T22:46:58Z

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

slack.com
- Triggering command: ./slack mcp-server (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

alexec · 2025-10-30T22:57:11Z

https://gh.io/copilot-coding-agent-docs please use github.com/mark3labs/mcp-go

alexec · 2025-10-30T23:08:42Z

@copilot Add an example of MCP server JSON you need to configure, remove the "client interaction".

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

Copilot · 2025-10-30T23:11:08Z

@copilot Add an example of MCP server JSON you need to configure, remove the "client interaction".

Updated in commit a838a30. Added MCP server configuration example and removed the client interaction JSON. The README now shows how to configure the server in an MCP client configuration file.

alexec · 2025-10-30T23:11:57Z

@copilot Users should run slack configure prior to using the tool, rather than hard-code the JIRA_TOKEN into the JSON.

…token Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

Copilot · 2025-10-30T23:14:49Z

@copilot Users should run slack configure prior to using the tool, rather than hard-code the JIRA_TOKEN into the JSON.

Updated in commit c3d580e. The MCP configuration now:

Instructs users to run slack configure first (stores token in keyring)
Removed the hardcoded SLACK_TOKEN from the JSON configuration
The MCP server will automatically use the token from the keyring

alexec · 2025-10-30T23:30:04Z

@copilot please add an example message to send, e.g. "Slack alex_collins@intuit.com to say how much you like this tool."

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

Copilot · 2025-10-30T23:32:32Z

@copilot please add an example message to send, e.g. "Slack alex_collins@intuit.com to say how much you like this tool."

Added in commit 3b67ada. The README now includes:

A CLI example: slack send-message alex_collins@intuit.com "I love this tool! It makes Slack integration so easy."
An MCP server example usage: "Slack alex_collins@intuit.com to say how much you like this tool."

Initial plan

14c88af

Copilot AI assigned Copilot and alexec Oct 30, 2025

Copilot started work on behalf of alexec October 30, 2025 22:17 View session

Copilot AI and others added 4 commits October 30, 2025 22:19

Initial analysis - plan for MCP server implementation

09f85a2

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

Add MCP server implementation with tests

85cc53a

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

Update documentation for MCP server feature

c3dad73

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

Update go.mod to mark golang.org/x/term as direct dependency

92ef6e6

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Add new sub-command to start tool as MCP server~~ Add MCP server sub-command for JSON-RPC tool integration Oct 30, 2025

Copilot finished work on behalf of alexec October 30, 2025 22:28

Copilot AI requested a review from alexec October 30, 2025 22:28

alexec reviewed Oct 30, 2025

View reviewed changes

Copilot started work on behalf of alexec October 30, 2025 22:32 View session

Copilot finished work on behalf of alexec October 30, 2025 22:33

Copilot AI requested a review from alexec October 30, 2025 22:33

Copilot started work on behalf of alexec October 30, 2025 22:39 View session

Refactor MCP implementation to use github.com/mark3labs/mcp-go library

1a75235

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

Copilot AI changed the title ~~Add MCP server sub-command for JSON-RPC tool integration~~ Add MCP server sub-command using mcp-go library Oct 30, 2025

Copilot finished work on behalf of alexec October 30, 2025 22:47

Copilot started work on behalf of alexec October 30, 2025 23:09 View session

Update README with MCP server configuration example

a838a30

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

Copilot finished work on behalf of alexec October 30, 2025 23:11

Copilot started work on behalf of alexec October 30, 2025 23:12 View session

Update MCP server config to use slack configure instead of hardcoded …

c3d580e

…token Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

Copilot finished work on behalf of alexec October 30, 2025 23:15

Copilot started work on behalf of alexec October 30, 2025 23:30 View session

alexec mentioned this pull request Oct 30, 2025

Add mcp-server subcommand for MCP protocol integration kitproj/jira-cli#7

Merged

9 tasks

Add example usage for both CLI and MCP server modes

3b67ada

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

Copilot finished work on behalf of alexec October 30, 2025 23:33

alexec approved these changes Oct 30, 2025

View reviewed changes

alexec marked this pull request as ready for review October 30, 2025 23:33

alexec merged commit 80ea54c into main Oct 30, 2025
2 checks passed

alexec deleted the copilot/add-mcp-server-sub-command branch October 30, 2025 23:34

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Copilot AI commented Oct 30, 2025

I tried to connect to the following addresses, but was blocked by firewall rules:

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Copilot AI commented Oct 30, 2025 •

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