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/instructions/policy-writing.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/policy-writing)<a href="https://agentmods.dev/instructions/piyushptiwari1/mcpkernel/policy-writing"><img src="https://agentmods.dev/badge/instructions/piyushptiwari1/mcpkernel/policy-writing/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/policy-writing"><img src="https://agentmods.dev/badge/instructions/piyushptiwari1/mcpkernel/policy-writing.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 | $0.00220 | $0.00220 |
| Opus 5.5 | $0.00088 | $0.00088 |
| Sonnet 5.5 | $0.00044 | $0.00044 |
| Haiku 4.5 | $0.00022 | $0.00022 |
Grade A, and why
mcpkernel policy-writing.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.
What it actually says
MCPKernel Policy Writing Guide
Policy Structure
version: "1.0"
rules:
- id: "rule-unique-id"
description: "What this rule does"
tool: "tool_name" # or "*" for all tools
action: "allow|deny|audit"
conditions:
- field: "argument_name"
operator: "equals|contains|matches|not_contains"
value: "match_value"
owasp_asi: "ASI-XX" # Optional OWASP mapping
Best Practices
- Use specific tool names over wildcards when possible
- Always include
descriptionfor audit trail clarity - Map rules to OWASP ASI categories for compliance reporting
- Test policies with:
python -m pytest tests/test_policy.py -v
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 · 28 lines · 220 tokens per session scan A 0031a95bf12f
mcpkernel policy-writing.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 220 tokens to every session, about $0.0009 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.
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