Borrowing it
Nothing to install: this file belongs to littlebearapps/untether. 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/littlebearapps/untether/master/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/littlebearapps/untetherWrote 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/instructions/littlebearapps/untether/copilot-instructions)<a href="https://agentmods.dev/instructions/littlebearapps/untether/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/littlebearapps/untether/copilot-instructions/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/instructions/littlebearapps/untether/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/littlebearapps/untether/copilot-instructions.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 | $0.00577 | $0.00577 |
| Opus 5.5 | $0.00231 | $0.00231 |
| Sonnet 5.5 | $0.00115 | $0.00115 |
| Haiku 4.5 | $0.00058 | $0.00058 |
Grade A, and why
untether copilot-instructions.md 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 18d 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 — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Untether — Copilot Instructions
Untether is a Telegram bridge for AI coding agents (Claude Code, Codex, OpenCode, Pi; Gemini CLI and Amp deprecated). It runs on the user's machine and bridges agents to Telegram, so users can send tasks by voice or text, approve changes, and read results from their phone — while agents work in the background.
Website: https://untether.cc · Help centre (user docs, synced flat from docs/ on master): https://littlebearapps.com/help/untether/<file-stem>/
Stack
- Python 3.12+, anyio (async), msgspec (JSONL parsing), structlog (logging)
- Ruff (linting/formatting), pytest + anyio (testing), 80% coverage threshold
- pydantic-settings for config, httpx for HTTP, typer for CLI
Code style
- Australian English in user-facing strings (realise, colour, behaviour, licence)
- Type hints on all public functions
- Use
match/case,type | Noneunions, and other Python 3.12+ features - Use
anyiofor async (not raw asyncio) - Use
msgspec.Structfor data classes (not dataclasses or pydantic models for schemas) - Use
structlogfor logging (not stdlib logging)
Architecture
Runners (src/untether/runners/) manage engine subprocesses, emit events via the 3-event contract (StartedEvent → ActionEvent(s) → CompletedEvent; Claude live sessions may follow it with TurnEvent segments, never a second CompletedEvent). RunnerBridge connects runners to the TelegramPresenter which handles message rendering and inline keyboards.
All Telegram writes go through TelegramOutbox — never call Bot API directly.
Testing patterns
- Stub subprocess runners with fake CLI scripts for engine tests
FakeTransportprotocol doubles instead of real Telegram clients- Verify the 3-event contract:
StartedEvent→ActionEvent(s)→CompletedEvent - Use
pytest-anyiofor async tests
Commit conventions
- Conventional commits:
feat:,fix:,docs:,refactor:,test:,chore: - Feature branches:
feature/*,fix/*,docs/* - Every bug fix references a GitHub issue
- Update CHANGELOG.md for user-facing changes
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.
- 18d ago Changed · +2 lines · +81 tokens per session 16fadae5cd88
- 1mo ago First seen · 43 lines · 496 tokens per session scan A 6d8c60984ad6
untether copilot-instructions.md is an instructions file published in the GitHub repository littlebearapps/untether (74 stars, last pushed today), licensed MIT. It adds 577 tokens to every session, about $0.0023 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.
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