Borrowing it
Nothing to install: this file belongs to piyushptiwari1/mcpkernel. 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/piyushptiwari1/mcpkernel/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/piyushptiwari1/mcpkernelWrote 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/piyushptiwari1/mcpkernel/copilot-instructions)<a href="https://agentmods.dev/instructions/piyushptiwari1/mcpkernel/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/piyushptiwari1/mcpkernel/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/piyushptiwari1/mcpkernel/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/piyushptiwari1/mcpkernel/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 | $0.01344 | $0.01344 |
| Opus 5.5 | $0.00538 | $0.00538 |
| Sonnet 5.5 | $0.00269 | $0.00269 |
| Haiku 4.5 | $0.00134 | $0.00134 |
Grade A, and why
mcpkernel 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 1mo 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 — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCPKernel — Project Context for All Agents
Project Overview
MCPKernel is an open-source Execution Sovereignty Stack — a mandatory, deterministic MCP/A2A gateway that makes every agent tool call provably replayable, taint-safe, and policy-enforced. Licensed under Apache 2.0.
Repository: piyushptiwari1/mcpkernel
Architecture
- 11 packages in
src/mcpkernel/: proxy, sandbox, dee, taint, context, ebpf, policy, audit, observability, cli, agent_manifest - Proxy: AsyncIO MCP/A2A transparent gateway with SSE/stdio transport
- Policy: YAML-based rules engine with OWASP ASI 2026 mappings
- Taint: Multi-mode taint tracking (FULL/LIGHT/OFF) for secrets, PII, user input
- Sandbox: Docker, Firecracker, WASM, Microsandbox backends
- DEE: Deterministic Execution Envelopes — hashed, Sigstore-signed, replayable
- Audit: Tamper-proof append-only logs with SIEM export (CEF, JSONL, CSV)
- Context: Environment snapshots and drift detection
- Observability: OpenTelemetry metrics and Prometheus export
- eBPF: Kernel-level syscall filtering
- Agent Manifest: agent.yaml loader, policy bridge, tool validator, proxy hook
Code Standards
- Python >=3.12 (tested on 3.12 and 3.13, developed on 3.13.12)
- Async-first using
asyncio - Type hints on all public APIs
- Tests in
tests/usingpytestwith async support - All 695 tests must pass before merging to main
- Coverage must be ≥80% (
python -m pytest --cov=mcpkernel) - Lint clean:
ruff check src/ tests/must show zero errors - Format clean:
ruff format --check src/ tests/must pass
Build & Test
# Install (using uv)
uv venv --python 3.13
source .venv/bin/activate
uv pip install -e ".[dev]"
# Run all tests
python -m pytest tests/ -v --tb=short
# Run specific test module
python -m pytest tests/test_proxy.py -v
# Lint + Format
ruff check src/ tests/
ruff format --check src/ tests/
# Type check
mypy src/mcpkernel/
Git Workflow
mainbranch: stable, all tests passingdevelopmentbranch: active work, may have failing tests- Feature branches:
feature/<description>off development - Bug fix branches:
fix/<description>off development - Always run tests before merging to main
- Use conventional commits:
feat:,fix:,docs:,test:,refactor:,chore:
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.
- 1mo ago First seen · 103 lines · 1,344 tokens per session scan A 3e1460e90a3b
mcpkernel copilot-instructions.md is an instructions file published in the GitHub repository piyushptiwari1/mcpkernel (2 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 1,344 tokens to every session, about $0.0054 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 2026-08-31.
Other instructions, from other repositories
AgentHound copilot-instructions.md
Copilot instructions for adithyan-ak/AgentHound: Keep generated examples local to the fixture project.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).