mcp-windbg is a Model Context Protocol server that lets AI models control WinDbg, the Windows debugger used to inspect crash dumps and debug user-mode or kernel software. Developers and investigators use it to run debugger commands, examine failures, and manage multiple live debugging sessions through natural-language requests. The catalogue add-ons connect coding agents to this debugging workflow.
Borrowing it
Nothing to install: this file belongs to svnscha/mcp-windbg. 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/svnscha/mcp-windbg/develop/CLAUDE.mdgit clone --depth 1 https://github.com/svnscha/mcp-windbgWrote 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/svnscha/mcp-windbg/claude-md)<a href="https://agentmods.dev/instructions/svnscha/mcp-windbg/claude-md"><img src="https://agentmods.dev/badge/instructions/svnscha/mcp-windbg/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/svnscha/mcp-windbg/claude-md"><img src="https://agentmods.dev/badge/instructions/svnscha/mcp-windbg/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 | $0.04221 | $0.04221 |
| Opus 5.5 | $0.01688 | $0.01688 |
| Sonnet 5.5 | $0.00844 | $0.00844 |
| Haiku 4.5 | $0.00422 | $0.00422 |
Grade A, and why
mcp-windbg 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 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.
How it starts
The opening of the file, as written. The whole thing — 289 lines — stays where its author put it; the contents beside it link to each section on GitHub.
mcp-windbg
A Model Context Protocol server that lets AI models
analyze Windows crash dumps and drive live or remote debugging through WinDbg/CDB. It is a
Python wrapper around cdb.exe: the model calls MCP tools, the server runs the matching
debugger commands and returns the text output. Windows-only (needs CDB). The single entry
point is mcp-windbg, which speaks MCP over stdio or streamable-http.
Build / test / run
Python 3.10+ with the uv package manager. CDB must be installed for the live tests (WinDbg
from the Microsoft Store, or the Windows SDK).
uv sync --dev # install incl. dev deps
uv run pytest src/mcp_windbg/tests/ -v # full test suite
uv run pytest src/mcp_windbg/tests/ -v -m "not live" # hermetic subset (no CDB)
uv run python -m mcp_windbg --verbose # run the server (stdio)
uv run python -m mcp_windbg --transport streamable-http --port 8000 # HTTP transport
pwsh scripts/Switch-McpWindbg.ps1 Local # Claude Code in this checkout: use the working copy
pwsh scripts/Switch-McpWindbg.ps1 Released # back to the published plugins, updated
Signing releases
The isolated sign job reads SIGNING_URL and SIGNING_API_KEY through its environment.
The API key is a repository Actions secret, separate from the hardware PIN; the signing
environment must not shadow it with an older value. A missing key or HTTP failure stops the
job before a signed artifact is uploaded. release-please.yml forwards secrets with
secrets: inherit; reusable callers must also supply SIGNING_API_KEY.
For acceptance, dispatch publish-mcp.yml on develop with rehearsal=true and leave tag
empty. This signs and verifies the binary and runs its Windows scenarios, without publishing
to PyPI or attaching a release asset. Keep the signing job free of checkouts and write tokens.
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 Changed · +1 lines · +13 tokens per session 57bfee9c4268
- 4d ago Changed · +12 lines · +166 tokens per session cfd0e5d68174
- 14d ago Changed · +29 lines · +430 tokens per session 6f24e3a25aa2
- 24d ago Changed · +6 lines · +112 tokens per session de674b9e1c97
- 25d ago Changed · +2 lines · +45 tokens per session 685e39ea792d
- 1mo ago Changed · +11 lines · +166 tokens per session 5173aeab2690
- 1mo ago First seen · 228 lines · 3,289 tokens per session scan A 344cba213753
mcp-windbg CLAUDE.md is an instructions file published in the GitHub repository svnscha/mcp-windbg (1,632 stars, last pushed yesterday), licensed MIT. It adds 4,221 tokens to every session, about $0.0169 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 2026-08-30.
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