Borrowing it
Nothing to install: this file belongs to Popplywop/tsql-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/Popplywop/tsql-mcp-server/master/CLAUDE.mdgit clone --depth 1 https://github.com/Popplywop/tsql-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/popplywop/tsql-mcp-server/claude-md)<a href="https://agentmods.dev/instructions/popplywop/tsql-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/popplywop/tsql-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/popplywop/tsql-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/popplywop/tsql-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 | $0.00798 | $0.00798 |
| Opus 5 | $0.00399 | $0.00399 |
| Sonnet 5 | $0.00160 | $0.00160 |
| Haiku 4.5 | $0.00080 | $0.00080 |
Grade A, and why
tsql-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 — 96 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/claude-code) when working with this repository.
Project Overview
This is a Model Context Protocol (MCP) server for SQL Server databases. It allows LLMs to query and inspect SQL Server databases through a standardized protocol using stdio transport.
Tech Stack
- .NET 10.0 - Target framework
- ModelContextProtocol SDK (0.5.0-preview.1) - MCP server implementation
- CommandLineParser - CLI argument parsing
- Microsoft.Data.SqlClient - SQL Server connectivity
Project Structure
src/
├── Program.cs # Entry point, host configuration
├── Options.cs # CLI options (--dsn, --env-var, --read-only)
├── Tools/
│ ├── QueryTool.cs # ExecuteQuery MCP tool
│ ├── StoredProcedureTool.cs # ExecuteStoredProcedure MCP tool
│ └── SchemaTool.cs # Lightweight schema exploration tools
├── Services/
│ ├── QueryService.cs # Query execution with read-only validation
│ ├── SqlConnectionService.cs
│ ├── SqlConnectionFactory.cs
│ ├── SqlInjectionValidationService.cs
│ └── DatabaseMetadataCache.cs
├── Handlers/
│ └── DatabaseResourceHandler.cs # MCP resource handlers
└── Models/ # Data models (TableInfo, ColumnInfo, etc.)
tests/
└── tsql-mcp-server-tests/ # Unit tests (xUnit)
Build & Run Commands
# Build
dotnet build src/tsql-mcp-server.csproj
# Run with connection string
dotnet run --project src/tsql-mcp-server.csproj -- --dsn "Server=...;Database=...;..."
# Run in read-only mode
dotnet run --project src/tsql-mcp-server.csproj -- --dsn "..." --read-only
# Run tests
dotnet test
# Build Docker image
docker build -t tsql-mcp-server .
# Run Docker container
docker run -i tsql-mcp-server --dsn "Server=host.docker.internal;Database=...;..."
Key Features
- Read-Only Mode (
--read-only): Blocks INSERT, UPDATE, DELETE, TRUNCATE, DROP, ALTER, CREATE, MERGE operations - SQL Injection Prevention: Built-in validation in
SqlInjectionValidationService - Stored Procedure Execution: Safe execution with parameterized inputs
- Resource Caching: 10-minute TTL cache for schema metadata
- Token Optimization: Compact JSON, optional definitions, character limits, schema tools
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 · 96 lines · 798 tokens per session scan A b9ae631ed9a5
tsql-mcp-server CLAUDE.md is an instructions file published in the GitHub repository Popplywop/tsql-mcp-server (7 stars, last pushed 7mo ago), licensed MIT. It adds 798 tokens to every session, about $0.0040 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 2026-08-31.
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