LogCarver MCP server

<!-- mcp-name: io.github.caiderek/logcarver-mcp -->

LogCarver.Mcp

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A read-only MCP server that lets an AI assistant answer "what rows were just deleted from this SQL Server table?" by reading the database's transaction log (fn_dblog). No Audit, CDC or Change Tracking needs to be enabled beforehand.

It is a thin wrapper over the decoding engine from LogCarver (MIT). Everything runs on your machine and nothing is sent anywhere.

Status: early (v0.1). On NuGet and in the official MCP registry as io.github.caiderek/logcarver-mcp.

What it does

One tool, finddeletedrows. It only runs SELECTs. It never changes data, and the optional undo SQL is plain text that the tool never executes.

The result is JSON: a summary (counts, truncation, warnings and notes) and events (kind, timestamp, LSN, transaction id, before/after column values, note). Binary values are hex strings and decimals are strings, so nothing is silently rounded.

Requirements and limits

• The connection's login must be sysadmin (fn_dblog requires it).
• You only see what is still in the active log. If the log space has been reused the result is empty, and that is not a bug. The paid LogCarverOffline tool can often recover that case by reading the raw .ldf.
• TRUNCATE and DROP cannot be recovered.
• Compressed tables are refused. time and xml columns and off-row LOB values are refused or flagged needsManualReview; they are never guessed.
• Validated on SQL Server 2025, 2022, 2019 and 2016 (SP2). Other versions return a warning in notes.
• Scanning a large active log can take a minute or more.

Configure

The connection string comes from an environment variable, so credentials never pass through the AI conversation:

LOGCARVER_MCP_CONNECTION_STRING=Server=localhost;Database=MyDb;Integrated Security=true;TrustServerCertificate=true

Or point LOGCARVERMCPCONNECTIONSTRINGFILE at a file that contains it.

The login is sysadmin and the caller is an AI, so the tool may only read the connection string's database. To let it read others, list them (comma or semicolon separated):

LOGCARVER_MCP_ALLOWED_DATABASES=Sales;HR

Row values come straight from the database. They are data, not instructions, and the tool description tells the model so.

Install

Needs the .NET 10 SDK or runtime.

dotnet tool install -g LogCarver.Mcp

Or run it without installing, through dnx:

dotnet dnx LogCarver.Mcp --yes

Claude Code

claude mcp add logcarver --env LOGCARVER_MCP_CONNECTION_STRING="Server=localhost;Database=MyDb;Integrated Security=true;TrustServerCertificate=true" -- logcarver-mcp

With dnx instead of a global tool, end the command with -- dotnet dnx LogCarver.Mcp --yes.

From source

Shortened. The full README is on GitHub.