Borrowing it
Nothing to install: this file belongs to nick-pape/grackle. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/nick-pape/grackle/main/.claude/skills/test-copilot-runtime/SKILL.mdgit clone --depth 1 https://github.com/nick-pape/grackleWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/nick-pape/grackle/test-copilot-runtime)<a href="https://agentmods.dev/skills/nick-pape/grackle/test-copilot-runtime"><img src="https://agentmods.dev/badge/skills/nick-pape/grackle/test-copilot-runtime/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/nick-pape/grackle/test-copilot-runtime"><img src="https://agentmods.dev/badge/skills/nick-pape/grackle/test-copilot-runtime.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00059 | $0.00709 |
| Opus 5.5 | $0.00024 | $0.00284 |
| Sonnet 5.5 | $0.00012 | $0.00142 |
| Haiku 4.5 | $0.00006 | $0.00071 |
Grade A, and why
test-copilot-runtime scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 47 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Test the GitHub Copilot runtime
How to spawn the copilot runtime against an isolated test server. Assumes a server from /launch-grackle (with GRACKLE_URL + GRACKLE_API_KEY exported).
Allowed model names ✅ / ❌
| Model | Works? | Notes |
|---|---|---|
claude-sonnet-4.5 |
✅ confirmed live | The @github/copilot-sdk README default; spawns and runs |
gpt-5 |
⚠️ likely | Documented for Copilot CLI; not individually confirmed here |
claude-sonnet-4 |
⚠️ likely | From GitHub's supported-models docs |
claude-haiku-4.5 |
⚠️ likely | From GitHub's supported-models docs |
gpt-4o |
❌ does NOT work | Model "gpt-4o" is not available. GPT-4o is intentionally absent from the Copilot CLI/SDK (only in Copilot Chat + the VS Code extension) |
⚠️
grackle runtimesadvertisesgpt-4ofor copilot — that is wrong/unavailable for the CLI. Useclaude-sonnet-4.5. (Catalog entry:packages/common/src/runtime-catalog.ts; worth fixing — see the runtime-catalog.)
Spawn it
grackle persona create "Copilot Tester" --runtime copilot --model claude-sonnet-4.5 \
--prompt "You are a test agent. When asked to run a command, use your shell tool to run exactly that one command and nothing else."
grackle spawn local "Use your shell tool to run exactly this one command, then stop: cat /nonexistent_file_xyz" --persona copilot-tester
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 47 lines · 0 tokens per session scan A 587b3e7d140b
test-copilot-runtime is a skill published in the GitHub repository nick-pape/grackle (22 stars, last pushed 4mo ago), licensed MIT. It adds 59 tokens to every session and 709 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
rpa-init
Run when the user invokes /rpa-init or asks to onboard or warm up context on a repository. The agent studies code, reads documentation and test code, sets up the dev environment as the project expects, runs tests, and writes a short project report. No extra user brief is required.
rpa-gen-rules
Use when the user invokes /rpa-gen-rules or asks to create, refresh, audit, or synchronize project instructions such as root AGENTS.md, Cursor .cursor/rules, or Claude Code .claude/rules, especially when existing rule trees have drifted.
rpa-feat
Run when the user invokes /rpa-feat together with a clear feature description (for example issue text). BDD workflow: plan, failing tests, implementation, green tests, full suite, docs and examples, linter at the end. Will not work correctly without the user supplying what to build.
rpa-bugfix
Run when the user invokes /rpa-bugfix together with a clear bug description (expected vs actual, reproduction). Reproduction test first, then fix, full test suite, short report. Will not work correctly without the bug details.
configure-coddy
Change Coddy's own configuration when the user asks for it: edit settings, providers, models, logging, permissions, or find, install, update, and remove MCP servers and skills. Stages UCI-style commands for config.yaml and commits only after the user confirms saving; MCP servers are entries of the mcp.json files. Load…
code-guidelines-go
Go 1.24–1.27 coding guidelines for the dimetron/pi-go AI agent runtime. Use this skill whenever writing, reviewing, or refactoring ANY Go code in pi-go. This covers idiomatic style, error handling, concurrency, project layout, testing (table-driven, fuzz, benchmarks, synctest), new stdlib usage, golangci-lint v2…