Record why Grok and Copilot CLI get no harness entry

[UnbreakableMJ]

Both were candidates for the harness table after the Kimi/Qwen survey. Neither should be added, and the reasons are worth writing down before someone re-derives them wrongly.

Grok already has engram's commands

Grok reads other vendors' directories on purpose. From its own bundled docs/user-guide/08-skills.md:

Location	Tier
~/.grok/skills/, ~/.grok/commands/	User
~/.claude/skills/, ~/.claude/commands/	User — Claude Code compatibility
~/.cursor/skills/	User — Cursor compatibility

And 05-configuration.md: "Every cell defaults to true."

Verified non-interactively with grok inspect:

Skills (79)
  └ engram-context      user [claude]
  └ engram-ingest       user [claude]
  └ engram-save-chat    user [claude]
MCP Servers (14)
  └ engram (stdio)      config

Engram's Claude Code install already serves Grok, on both surfaces. A Grok entry would write a second copy that Grok's own name-deduplication would shadow. Its own ~/.grok/skills is a home-manager symlink into the store here anyway.

Copilot CLI takes plugins, not files

$ copilot plugin --help
  install [options] <source>   Install a plugin
… from plugin marketplaces, GitHub repositories, repository subdirectories, or direct git URLs.

There is no directory engram can drop a command into. The previous reason — "no user-writable command or prompt directory" — invited exactly the wrong follow-up: this machine does have ~/.copilot/skills, but it is a symlink belonging to the user's own skills bundle, not to Copilot. Reading it as a surface would have shipped commands nothing loads — the Codex prompts/ mistake a second time. The detail now says what Copilot actually accepts.

Also surveyed, no change warranted

	Finding
Pi	0.80.6, bundled with Orca. No MCP registration, no command surface, all three session dirs empty — configured but unused.
Oh-My-Pi	Not installed. (omp on PATH is oh-my-posh 16.0.10.)
VS Code	engram registered in ~/.config/Code/User/mcp.json; prompts/ exists but is empty. A real surface — but an editor, not a CLI harness. Scope decision, not a defect.
Cursor	skills-cursor/ is vendor-shipped (Grok filters these as vendor defaults); no user ~/.cursor/skills, no engram MCP registration.
Cline	3.0.46, but ~/.cline/data/settings does not exist — never configured. Its skills come from npx skills, not a directory.

Gates

fmt · clippy -D warnings · 257 tests · REUSE 3.3 · makeinfo clean

🤖 Generated with Claude Code

https://claude.ai/code/session_016i16R4GhdSffsboRYq97Fs

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add a path for Grok-only installations

For a user who has Grok but not Claude Code, this premise fails: Harness::ALL has no Grok entry, while install skips Claude Code when its ~/.claude probe is absent, so nothing creates commands in any directory Grok scans. The cited grok inspect result only demonstrates a machine where Claude commands already exist. Add a detected Grok surface or otherwise arrange a Claude-compatible target; without one, Grok-only users cannot install these commands despite this paragraph saying no entry is needed.

AGENTS.md reference: AGENTS.md:L180-L180

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