Borrowing it
Nothing to install: this file belongs to alexei-led/k8s-mcp-server. 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/alexei-led/k8s-mcp-server/master/CLAUDE.mdgit clone --depth 1 https://github.com/alexei-led/k8s-mcp-serverWrote 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/alexei-led/k8s-mcp-server/claude-md)<a href="https://agentmods.dev/instructions/alexei-led/k8s-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/alexei-led/k8s-mcp-server/claude-md/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/alexei-led/k8s-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/alexei-led/k8s-mcp-server/claude-md.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 | $0.01008 | $0.01008 |
| Opus 5 | $0.00504 | $0.00504 |
| Sonnet 5 | $0.00202 | $0.00202 |
| Haiku 4.5 | $0.00101 | $0.00101 |
Grade A, and why
k8s-mcp-server CLAUDE.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 9d 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 — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.
K8s MCP Server — Development Guide
Build & Test Commands
make install # Install dependencies
make dev-install # Install with dev deps
make test # Unit tests only (default)
make test-all # All tests (incl. integration)
make test-integration # Integration tests (needs kubectl + cluster)
make lint # ruff check src/ tests/
make format # ruff format src/ tests/
Direct commands:
uv run pytest -q tests/unit/ # Fast unit tests
uvx ruff check src/ tests/ # Lint
python -m k8s_mcp_server # Run server locally
Architecture
Server (src/k8s_mcp_server/server.py)
- 8 tools: 4
execute_*+ 4describe_*, all delegating to_execute_tool_command()/_describe_tool_command() - CLI status checked at startup — tools gracefully error if CLI not installed
- Uses
FieldInfoworkaround for Pydantic Field defaults in timeout parameter ToolAnnotations:readOnlyHint=Truefor describe tools,destructiveHint=True, openWorldHint=Truefor execute tools
Security (src/k8s_mcp_server/security.py)
validate_command()— blocked patterns, required resource names for destructive opskubectl execrestrictions (no interactive shells)- Per-tool security rules validated before execution
Errors (src/k8s_mcp_server/errors.py)
- Hierarchy:
K8sMCPError→CommandValidationError,CommandExecutionError,AuthenticationError,CommandTimeoutError create_error_result()produces structuredCommandResultwithErrorDetails- Errors returned as tool results with
isError=true(MCP spec compliant), not as JSON-RPC errors
CLI Executor (src/k8s_mcp_server/cli_executor.py)
execute_command()— asyncio subprocess, pipe support (|splitting), timeoutget_command_help()— fetches--helpoutputcheck_cli_installed()— startup validation
Tools (src/k8s_mcp_server/tools.py)
CommandResult: status, output, error (optionalErrorDetails), exit_codeCommandHelpResult: help_text, status, error
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.
- 9d ago First seen · 106 lines · 1,008 tokens per session scan A 09174d3eb88d
k8s-mcp-server CLAUDE.md is an instructions file published in the GitHub repository alexei-led/k8s-mcp-server (213 stars, last pushed 6mo ago), licensed MIT. It adds 1,008 tokens to every session, about $0.0050 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 2026-08-30.
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