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Add GitHub Copilot backend to SkillOpt-Sleep

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Add CopilotCliBackend that drives the GitHub Copilot CLI in
non-interactive mode (copilot -p ... --output-format json) and parses the
JSONL event stream for assistant.message content. Registered as the
'copilot' backend (with aliases) and wired through the CLI, config,
experiment harness, and the Copilot MCP server's backend enum.

- Force UTF-8 decoding of CLI output (fixes cp1252 UnicodeDecodeError on
  Windows when responses contain non-cp1252 bytes).
- Minimise per-call startup: isolated COPILOT_HOME with built-in MCPs and
  custom instructions disabled, so user MCP servers are not spawned per
  call (~5x faster: 36s -> 7.4s). Override via SKILLOPT_SLEEP_COPILOT_HOME
  / SKILLOPT_SLEEP_COPILOT_MODEL / SKILLOPT_SLEEP_COPILOT_FULL_ENV.

Validated end-to-end on real held-out tasks (researcher persona:
0.42 -> 1.00 lift; gate correctly rejects non-improving edits).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
DB Lee
2026-06-12 08:21:57 -07:00
parent 5dc894715f
commit 21f93c16c7
6 changed files with 128 additions and 8 deletions
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plugins/copilot/README.md
+11 -2
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@@ -45,8 +45,17 @@ Ask Copilot things like *"run the sleep cycle"*, *"what did the last sleep
propose?"*, *"adopt the staged sleep proposal"*. Copilot calls the MCP tools:
`sleep_status`, `sleep_dry_run`, `sleep_run`, `sleep_adopt`, `sleep_harvest`.
Each tool takes optional `project`, `backend` (`mock`/`claude`/`codex`), and
`scope` arguments. Default backend is `mock` (no API spend).
Each tool takes optional `project`, `backend` (`mock`/`claude`/`codex`/`copilot`), and
`scope` arguments. Default backend is `mock` (no API spend). The `copilot`
backend drives the GitHub Copilot CLI (`copilot -p ... --output-format json`)
and requires the `copilot` CLI to be installed and authenticated.
For speed, the `copilot` backend runs each call against an isolated
`COPILOT_HOME` with built-in MCP servers and custom instructions disabled, so
your user MCP servers (including this project's own) are not spawned per call
(~5x faster). Override with `SKILLOPT_SLEEP_COPILOT_HOME=<dir>`, pick a model
with `SKILLOPT_SLEEP_COPILOT_MODEL`, or set `SKILLOPT_SLEEP_COPILOT_FULL_ENV=1`
to use your real Copilot environment instead.
## Verify the server directly (no Copilot needed)