[steve-calvert-glean]

Problem

Before we build the Glean plugin once for every client, we need evidence of how each client loads an Agent Plugins package. The docs don't answer everything: Cursor doesn't expand ${PLUGIN_ROOT}, Claude Code doesn't read the format, and Copilot's behavior with our local MCP server was untested.

Change

Adds docs/agent-plugins-client-tests.md, with the test results. The tests ran against the Codex package that #35 builds with pluginpack 0.12.0 contents:

• Codex 0.160.1: installs from the marketplace and runs the MCP server from the plugin root.
• Copilot CLI 1.0.100: installs the package unchanged with 19 skills and runs the MCP server from ${PLUGIN_ROOT}. Installing from a path is deprecated, so Copilot needs a marketplace entry.
• Claude Code 2.1.284: ignores a root plugin.json and mcp.json placed next to its own manifest, so one directory can carry both.
• Data directory: Codex sets only PLUGIN_DATA, and start.mjs reads only CLAUDE_PLUGIN_DATA, so Codex users keep using ~/.glean.

VS Code, Cursor and a signed-in Copilot session still need a GUI session. The doc lists the exact checks.

Docs only; nothing ships.

[steve-calvert-glean]

Closing. This records one test run, and it goes stale as the clients change. #37 adds npm run e2e:install, which runs the same install checks on demand. The host support table moves into the README.