Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/jsturtevant/local-code-interpreter-tool/copilot-instructionsgit clone --depth 1 https://github.com/jsturtevant/local-code-interpreter-toolWhat 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 | $0.01016 | $0.01016 |
| Opus 5 | $0.00508 | $0.00508 |
| Sonnet 5 | $0.00203 | $0.00203 |
| Haiku 4.5 | $0.00102 | $0.00102 |
Grade A, and why
local-code-interpreter-tool 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 2d 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 — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Local Code Interpreter Tool - Copilot Instructions
Project Overview
A local code interpreter tool built with the Microsoft Agent Framework. It provides sandboxed code execution capabilities for AI agents.
Architecture
src/local_code_interpreter/
├── __init__.py # Package initialization
├── __main__.py # CLI entry point
├── tools.py # CodeExecutionTool - the core execution logic
└── agent.py # ChatAgent setup, CLI, and DevUI
Key Components
-
CodeExecutionTool (
tools.py): The main tool class that executes code. Supports two environments:python: Fast subprocess execution (default)hyperlight: VM-isolated sandbox using hyperlight-nanvix (JavaScript or Python)
-
create_interpreter_agent (
agent.py:185): Factory function that creates a configured ChatAgent with the code execution tool.
Key pattern: Tools are defined once in tools.py and imported by the agent. When adding new capabilities, add the tool function to tools.py first, then register it in the agent's tools=[] list.
Execution Environments
Python Subprocess (default)
- Fast execution in isolated subprocess
- Output captured via stdout/stderr
- Configurable timeout (default 30s)
- Environment stripped for security
Hyperlight VM Sandbox
- Uses hyperlight-nanvix for VM-level isolation
- Supports JavaScript (default) and Python
- Requires Linux with KVM support (
/dev/kvm) - Higher security for untrusted code execution
Development Commands
This project uses just as a task runner. All commands automatically use the virtual environment.
# Initial setup (creates venv and installs deps)
just setup
cp .env.example .env # Configure API keys
# Run agent (auto-detects OpenAI vs Azure based on env vars)
just run # Run with example queries
just interactive # Interactive chat mode
# Code quality
just format # Format with black
just lint # Lint with ruff
just lint-fix # Auto-fix lint issues
just typecheck # Type check with mypy
just check # Run all quality checks
# Testing
just test # Run tests
just test-ci # Tests with coverage reports
# Build & CI
just build # Build package
just clean # Clean artifacts
just ci # Run full CI pipeline locally
just pre-commit # Validate before committing
# Utilities
just # Show all available commands
just info # Show environment info
just tree # Show project structure
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.
- 2d ago First seen · 135 lines · 1,016 tokens per session scan A 2e016b8b2318
local-code-interpreter-tool copilot-instructions.md is an instructions file published in the GitHub repository jsturtevant/local-code-interpreter-tool (2 stars, last pushed 7mo ago), licensed MIT. It adds 1,016 tokens to every session, about $0.0051 per session on Opus 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 2026-08-31.
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