Borrowing it
Nothing to install: this file belongs to luke-nielsen/walmart-mcp. 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/luke-nielsen/walmart-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/luke-nielsen/walmart-mcpWrote 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/luke-nielsen/walmart-mcp/claude-md)<a href="https://agentmods.dev/instructions/luke-nielsen/walmart-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/luke-nielsen/walmart-mcp/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/luke-nielsen/walmart-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/luke-nielsen/walmart-mcp/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 | $0.01063 | $0.01063 |
| Opus 5 | $0.00531 | $0.00531 |
| Sonnet 5 | $0.00213 | $0.00213 |
| Haiku 4.5 | $0.00106 | $0.00106 |
Grade A, and why
walmart-mcp 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 — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
Guidance for Claude Code working in this repo.
What this is
A from-scratch TypeScript Walmart API client, delivered as an MCP server (stdio) with a reusable SDK underneath. It wraps two distinct Walmart APIs behind one client:
- Marketplace (seller) —
https://marketplace.walmartapis.com, OAuth 2.0. Items, inventory, prices, orders. - Affiliate / Catalog (consumer) —
https://developer.api.walmart.com/..., RSA signature auth. Product search, lookup, taxonomy, trending, reviews, store locator (read-only).
Either surface can be configured independently; tools register only for configured surfaces.
The locked implementation spec is tech.md — consult it before changing auth,
the HTTP client, or the tool surface. README.md covers setup.
Hard constraints (the two APIs genuinely differ — do not unify them)
- Two auth schemes, not one. Marketplace uses an OAuth bearer token (
WM_SEC.ACCESS_TOKEN) that expires (~15 min) and is cached + refreshed. Affiliate signs every request with the RSA private key (WM_SEC.AUTH_SIGNATURE) — no token, nothing to cache. Don't try to route affiliate through the token path or vice versa. - Two base URLs. The client picks the base URL from the request's
surface. - Affiliate is read-only. It has no cart/checkout/write. Writes live on Marketplace (inventory, price, order acknowledge).
- Affiliate access is gated. Credentials require Walmart.io affiliate-program approval; Marketplace requires a Seller/Solution-Provider account. The code degrades gracefully when a surface is unconfigured (its tools simply aren't registered).
Commands
npm run build # tsc → dist/ (required before running the MCP server)
npm test # vitest, fetch mocked — no credentials needed
npm run typecheck # tsc --noEmit
npm run check # validate whichever surfaces are configured (loads .env)
npm start # run the MCP server standalone (loads .env via --env-file)
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 · 87 lines · 1,063 tokens per session scan A 86985249fe0a
walmart-mcp CLAUDE.md is an instructions file published in the GitHub repository luke-nielsen/walmart-mcp (0 stars, last pushed 2mo ago), licensed MIT. It adds 1,063 tokens to every session, about $0.0053 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 2026-09-01.
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