Add GitHub Copilot as a fourth plugin host (CLI + VS Code)#26
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eshwar-sundar-glean wants to merge 1 commit into
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Add GitHub Copilot as a fourth plugin host (CLI + VS Code)#26eshwar-sundar-glean wants to merge 1 commit into
eshwar-sundar-glean wants to merge 1 commit into
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GitHub Copilot's agent-plugin format is shared with Claude Code, so the
existing Claude-format plugin (.claude-plugin/plugin.json + .mcp.json +
skills/) is what Copilot loads — no separate Copilot plugin manifest, and
deliberately no .plugin/plugin.json, since the Copilot-native format defines
no plugin-root token and would break the ${CLAUDE_PLUGIN_ROOT} reference that
locates start.sh.
- Add .github/plugin/marketplace.json so the repo is a first-class Copilot
marketplace, mirroring the per-host marketplace manifests for Claude,
Cursor, and Codex.
- Map Copilot CLI's COPILOT_AGENT_SESSION_ID to GLEAN_SESSION_ID in start.sh
so sessions are stable under Copilot instead of falling back to a generated
per-process id.
- Document the Copilot install flow (CLI + VS Code) and update the session-id
var reference and Layout in the README.
- Bump all three plugin manifests 0.2.33 -> 0.2.34 (start.sh is a tracked
plugin runtime file).
eshwar-sundar-glean
requested review from
garvit-scio,
mohit-gupta-glean and
swarup-padhi-glean
as code owners
swarup-padhi-glean
approved these changes
Jun 23, 2026
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| elif [ -n "${COPILOT_AGENT_SESSION_ID:-}" ]; then | ||
| export GLEAN_SESSION_ID="$COPILOT_AGENT_SESSION_ID" |
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Can we have a screenshot testing this being set and not being an issue as we found in cursor?
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Summary
Adds GitHub Copilot (CLI and VS Code) as a fourth supported host. Copilot's agent-plugin format is shared with Claude Code, so the existing Claude-format plugin (
.claude-plugin/plugin.json+.mcp.json+skills/) is what Copilot loads — there's no separate Copilot plugin manifest, and deliberately no.plugin/plugin.json: the Copilot-native format defines no plugin-root token, which would break the${CLAUDE_PLUGIN_ROOT}reference that locatesstart.sh.Changes
.github/plugin/marketplace.json(new) — makes the repo a first-class Copilot marketplace at the GitHub-native location, mirroring the per-host marketplace manifests for Claude (.claude-plugin/), Cursor (.cursor-plugin/), and Codex (.agents/plugins/).start.sh— maps Copilot CLI'sCOPILOT_AGENT_SESSION_IDtoGLEAN_SESSION_ID, so sessions are stable under Copilot instead of falling back to a generated per-process id.GLEAN_SESSION_IDvar reference, and Layout tree.0.2.33 → 0.2.34(in lockstep;start.shis a tracked plugin runtime file, socheck-version-bump.shrequires it).Install
Copilot CLI:
VS Code: register the marketplace via
chat.plugins.marketplaces(or Chat: Install Plugin From Source), then install glean-vnext from the Agent Plugins view (@agentPlugins).Testing
npm run typecheckclean;npm test→ 154/154 pass;npm run build→dist/byte-identical (dist-sync gate green).bash -n start.shclean; all marketplace/plugin manifests validate as JSON; the three plugin versions are aligned at 0.2.34.Remaining manual verification
The Copilot CLI isn't installed in my environment, so a live skill-load smoke test wasn't possible. The
glean_runskill uses an underscore where the docs suggest kebab-case, but the documented silent-failure mode is namespace-prefix + dir/name mismatch (neither applies here, and Claude Code loads it today). After install, confirmglean_runappears under/skills; rename toglean-runonly if it doesn't (cross-host change).