Add OpenCode Support

[youenchene]

Summary

Adds OpenCode support for the Slack Skills Plugin:

• Repository-local OpenCode configuration with Slack MCP, seven canonical skills, and five namespaced slack-* commands.
• Optional global installer, sync, and uninstall commands with ownership and symlink-safety protections.
• Documentation and structural tests for the OpenCode integration.

Important: OpenCode authentication still requires an eligible Slack app client ID. Users must set SLACK_OPENCODE_CLIENT_ID before running opencode mcp auth slack; no client ID or secret is included in this repository.

This is an LLM-assisted proposal. I have tried to keep it safe and aligned with the repository’s conventions, but I welcome candid review and am happy to revise or reduce the approach if it does not meet the project’s standards.

Preview

No visual UI changes.

Testing

Passed locally:

• make test-unit
• make lint
• make typecheck

make test was also run. Its unit-test portion passed, but eval tests could not run because no GEMINI_API_KEY / GEMINI_API_KEY_* is configured locally. These evals require external credentials and should run in the upstream CI environment.

Notes

• The installer does not write secrets or a Slack client ID.
• It preserves existing user configuration and avoids following symlinked configuration or installed files.
• The global installer is optional; repository-local OpenCode support remains available.

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run make test and the tests pass. (except gemini needed a key)

[changeset-bot]

🦋 Changeset detected

Latest commit: fba6742

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
slack	Minor

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[hello-ashleyintech]

hi, @youenchene! Thanks so much for submitting this PR!

I am checking internally right now to see if we have progressed in setting up OpenCode as a supported client on the Slack side, which will determine if this PR is feasible or not. Will drop in with an update!

[WilliamBergamin]

Hi @youenchene thanks for your interest and contribution to the project 💯

Supporting Open code is something we want to add in this project but I think we might want to follow to config hook pattern similar to this https://github.com/obra/superpowers/blob/main/.opencode/plugins/superpowers.js

[youenchene]

Hi @youenchene thanks for your interest and contribution to the project 💯

Supporting Open code is something we want to add in this project but I think we might want to follow to config hook pattern similar to this https://github.com/obra/superpowers/blob/main/.opencode/plugins/superpowers.js

I just submitted a new version. Tell what you think.