What is assay CLAUDE.md?

Project instructions for Assay, a security scanner for AI development tools such as Claude Code plugins, MCP servers, hooks, and settings. They cover its Go application, embedded web interface, commands, tests, and build requirements.

Use them when working on Assay's Go backend, React interface, security scans, build process, test suites, or development commands.

They give an agent the repository-specific rules needed to build, test, and change the scanner correctly.

How chawdamrunal/assay configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to chawdamrunal/assay. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/chawdamrunal/assay/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/chawdamrunal/assay

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/chawdamrunal/assay/claude-md/github.svg)](https://agentmods.dev/instructions/chawdamrunal/assay/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/chawdamrunal/assay/claude-md"><img src="https://agentmods.dev/badge/instructions/chawdamrunal/assay/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/chawdamrunal/assay/claude-md"><img src="https://agentmods.dev/badge/instructions/chawdamrunal/assay/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,739 This file is loaded in full into every session.

When invoked 2,739 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.02739	$0.02739
Opus 5.5	$0.01096	$0.01096
Sonnet 5.5	$0.00548	$0.00548
Haiku 4.5	$0.00274	$0.00274

Measured 1mo ago against content hash 78cb9aacad3a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

assay 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 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.

CLAUDE.md · 107 lines

How it starts

The opening of the file, as written. The whole thing — 107 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

What Assay is

Assay is a security scanner for the AI dev stack (Claude Code plugins, MCP servers, hooks, settings). It reasons about an artifact with an LLM ("LLM as judge, not janitor") rather than pattern-matching. It compiles to a single Go binary (bin/assay) with the React SPA embedded via embed.FS. The Go module is github.com/chawdamrunal/assay.

The default scan path drives the reasoning through the user's Claude Code subscription, not the Anthropic API — this is a hard product constraint (see README.md "How scans run"). The API path exists only as a --scan-mode legacy fallback.

Commands

Build, test, and lint go through the Makefile. Note it hardcodes GO := /opt/homebrew/opt/go/bin/go and expects golangci-lint and pnpm (via corepack enable) on PATH — golangci-lint is often not installed by default, so verify it locally before relying on make lint. Keep the Go-version pins in go.mod, the Makefile, and .github/workflows/ in sync before pushing.

make build     # builds the SPA, copies it to internal/api/dist, then compiles bin/assay
make test      # go test -race ./...  AND  cd web && pnpm lint (tsc --noEmit)
make lint      # golangci-lint run ./...  AND  pnpm lint
make install   # copies bin/assay to ~/.local/bin (override PREFIX=/usr/local)

make build runs make web first (pnpm install --frozen-lockfile && pnpm build), which is required because the Go binary embeds internal/api/dist/index.html — verify-embed fails the build if the embed copy didn't land.

Running a single Go test:

/opt/homebrew/opt/go/bin/go test -race ./internal/scanner/ -run TestName
/opt/homebrew/opt/go/bin/go test -race ./internal/verdict/ -run TestValidator/subtest

Three test suites, three cost profiles (build tags)

Default — go test ./.... All Sonnet calls use internal/claude/fake.go FakeClient. Zero API cost. Gates every merge.
Integration — go test -tags integration ./.... Replays recorded responses from testdata/recorded/ against the golden corpus. Still zero API cost, full pipeline end-to-end.
Smoke — go test -tags smoke ./.... Hits the real Anthropic API, needs ANTHROPIC_API_KEY, ~$0.20/run. Excluded from CI; run manually before release. Lives in internal/scanner/realapi_test.go.

Read the full file on GitHub · 107 lines

Changes

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 · 107 lines · 2,739 tokens per session scan A 78cb9aacad3a

Subscribe to this mod's changes

assay CLAUDE.md is an instructions file published in the GitHub repository chawdamrunal/assay (4 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 2,739 tokens to every session, about $0.0110 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.

Claude Code LLM Security ai-security devsecops mcp security-scanner

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 9,715 tokens

assay: Instructions file for Claude Code

Borrowing it

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

CLAUDE.md

What Assay is

Commands

Three test suites, three cost profiles (build tags)

What this file has done since we first saw it

Other instructions, from other repositories

vscode buildNext.instructions.md

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vscode model-prompts.instructions.md