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/piyushptiwari1/mcpkernel/testing-guidelinesgit clone --depth 1 https://github.com/piyushptiwari1/mcpkernelWhat 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 | $0.00330 | $0.00330 |
| Opus 5 | $0.00165 | $0.00165 |
| Sonnet 5 | $0.00066 | $0.00066 |
| Haiku 4.5 | $0.00033 | $0.00033 |
Grade A, and why
mcpkernel testing-guidelines.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 yesterday.
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 Testing Guidelines
Framework
- pytest with
pytest-asynciofor async tests - Mark async tests:
@pytest.mark.asyncio - Shared fixtures in
tests/conftest.py
Test Structure
class TestFeatureName:
"""Tests for feature_name."""
def test_expected_behavior(self):
"""Test that X does Y when Z."""
# Arrange
...
# Act
result = function_under_test(...)
# Assert
assert result == expected
@pytest.mark.asyncio
async def test_async_behavior(self):
"""Test async operation."""
result = await async_function(...)
assert result is not None
Naming
- Files:
test_<module>.py - Classes:
TestClassName - Functions:
test_<behavior>_<condition>
Commands
# All tests
python -m pytest tests/ -v --tb=short
# Single file
python -m pytest tests/test_proxy.py -v
# Single test
python -m pytest tests/test_proxy.py::TestProxy::test_name -v
Rules
- Tests must not depend on external services
- Use mocks for I/O —
unittest.mock.AsyncMockfor async - Each test must be independent and idempotent
- Target: all 106+ existing tests must continue to pass
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.
- yesterday First seen · 56 lines · 330 tokens per session scan A ceed84e6988c
mcpkernel testing-guidelines.instructions.md is an instructions file published in the GitHub repository piyushptiwari1/mcpkernel (2 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 330 tokens to every session, about $0.0016 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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