Runs on your machine from its package; the steps are below.
What it does
- Reads
- Writes
- High impact
At most: only reads or looks up information.
What it costs
FreeOdel charges nothing per call. The publisher may charge for its own service.
Runs locally over stdio
This server isn't hosted — your MCP client launches it from a package registry. Use one of the commands below, or drop the config into your client (e.g. Claude Desktop).
Published to NuGet as `LogCarver.Mcp` — run it with your .NET MCP host.
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, find_deleted_rows. It only runs SELECTs. It never changes data, and the optional undo SQL is plain text that the tool never executes.
| Parameter | Meaning |
|---|---|
table (required) | Schema-qualified, e.g. dbo.Orders |
database | Defaults to the database in the connection string. Any other database is refused unless listed in LOGCARVER_MCP_ALLOWED_DATABASES |
operations | delete (default), update, insert, all |
from, to | ISO 8601 time window, server-local time, no zone conversion |
key | Column=Value, return one row's history only. Column name is case-insensitive; dates, bit, decimals and hex binary match as you would write them |
maxRows | Default 20, max 500, 0 = counts only. The most recent events are kept |
includeUndoSql | Also return suggested SQL that would reverse each event |
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_dblogrequires 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. TRUNCATEandDROPcannot be recovered.- Compressed tables are refused.
timeandxmlcolumns and off-row LOB values are refused or flaggedneedsManualReview; 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 LOGCARVER_MCP_CONNECTION_STRING_FILE 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
git clone --recurse-submodules https://github.com/caiderek/LogCarver.Mcp
dotnet build
dotnet run --project src/LogCarver.Mcp
Tests
dotnet test tests/LogCarver.Mcp.Tests
dotnet test tests/LogCarver.Mcp.IntegrationTests
The integration tests need a local SQL Server and a sysadmin Windows login. They create and drop their own sandbox database, LogCarver_McpTests.
License
MIT, see LICENSE.
