Borrowing it
Nothing to install: this file belongs to bch1212/queryshield. 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/bch1212/queryshield/main/CLAUDE.mdgit clone --depth 1 https://github.com/bch1212/queryshieldWrote 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/bch1212/queryshield/claude-md)<a href="https://agentmods.dev/instructions/bch1212/queryshield/claude-md"><img src="https://agentmods.dev/badge/instructions/bch1212/queryshield/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/bch1212/queryshield/claude-md"><img src="https://agentmods.dev/badge/instructions/bch1212/queryshield/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 | $0.00898 | $0.00898 |
| Opus 5.5 | $0.00359 | $0.00359 |
| Sonnet 5.5 | $0.00180 | $0.00180 |
| Haiku 4.5 | $0.00090 | $0.00090 |
Grade A, and why
queryshield 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 7d 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 — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.
QueryShield — Claude Code Context
What this is
Lead product of one agent security suite. Agents POST to /v1/query in NL
or structured SQL. QueryShield validates → translates → applies row-level
security → executes → audits. The same qs_ API key and the same Stripe
customer also cover the named credential vault (credentials.py), ported
from AgentVault. InjectShield (https://github.com/bch1212/injectshield,
https://injectshield.dev) is the free prompt-injection funnel and is not
vendored here. Agents never see database connection strings.
Architecture
proxy.py— engine. Every query flows throughexecute_query().safety.py— sqlglot AST validator. Never use keyword filtering.rls.py— AST-level WHERE injection + schema/table whitelists. Never string concat.vault.py— Fernet-encrypted database connection strings, in our internal Postgres. Replaces AWS Secrets Manager from the original spec (Brett's stack uses Railway, no AWS). Never returned by any API.credential_crypto.py/credentials.py/credential_api.py— named secret vault (AgentVault folded in). SameVAULT_KEY, same tenant, sameqs_key. Empty permission patterns fail closed. Audit metadata only.nl_to_sql.py— Claude tool_use loop withget_schema+validate_querytools. Prompt caching on system + schema.schema.py— DB introspection with two-tier cache (in-process + Redis).cache.py— result cache. Redis ifREDIS_URL, else in-process dict.audit.py— append-only metadata log. Never log row contents.billing.py— Stripe-backed quotas. 30-day rolling reset.mcp_server.py— FastMCP wrapper, distribution channel for agent frameworks.main.py— FastAPI app and HTTP surface.start.py— Railway entrypoint. ReadsPORTviaos.getenv(Railway exec's startCommand without a shell, so$PORTdoesn't expand).
Critical rules
- NEVER allow non-SELECT —
safety.pyblocks at the AST level. - NEVER log query result rows — audit table holds metadata only.
- NEVER return raw connection strings in any API response.
- VAULT_KEY rotation = re-encrypt every row under the new key. Losing the key means losing access to every registered DB.
- Customer DB credentials should be read-only at the source. Defense in depth — even if safety + RLS were bypassed, the DB would refuse writes.
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.
- 7d ago Changed · +7 lines · +153 tokens per session bb8c468c75e0
- 1mo ago First seen · 63 lines · 745 tokens per session scan A b9cf9f19be49
queryshield CLAUDE.md is an instructions file published in the GitHub repository bch1212/queryshield (1 stars, last pushed 7d ago), licensed MIT. It adds 898 tokens to every session, about $0.0036 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.
Other instructions, from other repositories
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).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.