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GitHub Copilot CLI as optional zero-cost provider via copilot -p programmatic mode
Passed 21 of 22 test cases with the skill, and 8 of 22 without it.
and 22 more in the full report
13 fixed8 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 13 test cases the skill fixed. Same model, same prompt, with and without the skill.
If `OCTOPUS_COPILOT_MODEL` is not set in the environment, what default model selector does Claude Octopus pass to Copilot CLI?
| Checked | Without skill | With skill |
|---|---|---|
| States that auto is the default model selector. | Missed | Passed |
The instructions your model reads when the skill loads.
GitHub Copilot CLI (GA since Feb 2026) serves as an optional provider in the Claude Octopus
multi-LLM ecosystem. Integration uses the official copilot -p programmatic mode, not
reverse-engineered API endpoints.
Core principle: Copilot supplements existing providers for research and exploration at zero additional cost (uses existing GitHub Copilot subscription). Each prompt counts as one premium request against your subscription quota.
Agent types: copilot (general), copilot-research (research-focused)
# Check copilot CLI is available
if ! command -v copilot &>/dev/null; then
# Copilot CLI not installed — silently skip
return 0
fi
Graceful degradation: When Copilot CLI is unavailable or unauthenticated, silently skip. Other providers continue to operate normally.
Copilot CLI checks credentials in this precedence order:
COPILOT_GITHUB_TOKEN env var (highest priority — fine-grained PAT with "Copilot Requests" permission)GH_TOKEN env varGITHUB_TOKEN env varcopilot login)gh) authentication fallbacktest cases passed, vs 8 / 22 without
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