Aethelgard Ledger

finance.aethelgardPublished by aethelgard.financev0.1.1Updated Oct 30, 2026

Double-entry, multi-entity, tamper-evident ledger for AI agents. Unbalanced journals are rejected.

VerifiedSTDIODesktop onlyDatabasesFinance

Overview

AI-generated overview

Local double-entry accounting ledger for AI agents: create entities and accounts, post balanced journals, and check trial balances and hash-chain integrity.

What you can do
  • Create and list entities (companies, trusts, individuals) and their charts of accounts
  • Post double-entry journals, with unbalanced postings rejected and the reason returned
  • List transactions with every journal line, filtered by date
  • Produce a trial balance for one entity or a combined trial balance for a parent and its direct subsidiaries
  • Verify the per-entity SHA-256 hash-chain and return the latest chain hash
When to use it
Useful when you want an assistant to keep real books locally — booking rent, expenses or other journals for one or more entities — with accounting rules enforced by the engine rather than by the model. Suited to evaluation and business bookkeeping experiments, not to production accounting without independent verification.
Requirements
Runs as a local stdio process from a downloaded platform build (Windows, macOS or Linux); no account, API key or environment variable is required. The ledger file is stored by default in the platform's application data directory, and can be relocated with the --vault option or the AETHELGARD_LEDGER_VAULT variable, or made throwaway with --ephemeral.
Before you install
The ledger file is not encrypted, and the README says output must not be relied on without independent verification. The hash-chain is unkeyed, so record the latest chain hash outside the ledger for later comparison. Everything the tools return, such as balances and transactions, is visible to your MCP client and the AI model provider. It is an evaluation build under a separate licence, and consolidation is a plain sum by account code without intercompany eliminations.

Installation

In SourceWeft

  1. Open Aethelgard Ledger in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

Aethelgard Ledger

A double-entry, multi-entity, tamper-evident ledger for AI agents.

Aethelgard Ledger is a local Model Context Protocol server. It gives your agent real accounting tools backed by an engine that enforces accounting rules. The agent can't talk its way past them. It is the same engine that runs the Aethelgard desktop ledger.

Evaluation build, for business use only. Licensed under the Aethelgard Ledger Evaluation Licence. The ledger file is not encrypted, and output must not be relied on without independent verification.

What it does

  • Balanced journals or nothing. Every posting must balance. If debits don't equal credits, the engine rejects the posting and returns the reason, so the agent can't book it.
  • Multi-entity. Companies, trusts and individuals across 9 jurisdictions, with subsidiaries linked to a parent and a combined group trial balance. This is a straight sum by account code, not a full consolidation; eliminations live in the Aethelgard desktop app.
  • Tamper-evident. Every posting is linked into a per-entity SHA-256 hash-chain, so an entry edited outside the engine fails the integrity check. The chain is unkeyed. For independent assurance, record the latest chain hash (returned by verify_integrity) somewhere outside the ledger and compare it later.
  • Local. The ledger lives in a file on your machine and is never sent to us.

Tools

ToolWhat it does
create_entityCreate a company, trust or individual, optionally as a subsidiary of a parent
create_accountAdd an account (ASSET, LIABILITY, EQUITY, REVENUE, EXPENSE)
post_transactionPost a double-entry journal; unbalanced journals are rejected
list_entitiesList entities
list_accountsList an entity's chart of accounts
list_transactionsList postings with every journal line, filtered by date
trial_balanceTrial balance for one entity
consolidateCombined trial balance for a parent and its direct subsidiaries, summed by account code (no intercompany eliminations)
verify_integrityVerify the hash-chain and return the latest chain hash

Download

Get the latest build from Releases.

PlatformFileSigning
Windows (x86_64)aethelgard-mcp-<version>-windows-x86_64.zipSigned by Aethelgard Finance Ltd
macOS (Intel + Apple Silicon)aethelgard-mcp-<version>-macos-universal.zipDeveloper ID signed and notarized by Apple
Linux (x86_64, static)aethelgard-mcp-<version>-linux-x86_64.tar.gzVerify with SHA256SUMS

Quick start

  1. Unzip it and put aethelgard-mcp somewhere permanent. Check it runs: aethelgard-mcp --version.

  2. Add it to your MCP client as a local (stdio) server.

    Claude Code

    bash
    claude mcp add aethelgard-ledger -- /full/path/to/aethelgard-mcp

    Claude Desktop, Cursor and other clients

    json
    {  "mcpServers": {    "aethelgard-ledger": { "command": "/full/path/to/aethelgard-mcp" }  }}

    On Windows, use the path to aethelgard-mcp.exe with doubled backslashes, e.g. "C:\\Tools\\aethelgard-mcp.exe".

  3. Ask your agent to keep some books. For example: "Create PropCo Ltd (GBP, GB, UkLtd) with a bank and a rental income account, then post October's £1,500 rent."

Where the ledger is kept

PlatformDefault location
Windows%APPDATA%\Aethelgard Ledger
macOS~/Library/Application Support/Aethelgard Ledger
Linux~/.local/share/aethelgard-ledger

To keep it somewhere else, use --vault <DIR> or set AETHELGARD_LEDGER_VAULT. Use --ephemeral for a throwaway ledger that is deleted when the server stops. Run aethelgard-mcp --help for every option.

Your data

The server runs on your machine and does not send your ledger to us. There is no telemetry. Your MCP client and the AI model you connect see whatever the tools return, such as balances and transactions, under that provider's terms. Choose them accordingly.

Licence

Aethelgard Ledger Evaluation Licence, which covers free evaluation and internal pilots for business use. Open-source components are listed with their licences in THIRD-PARTY-NOTICES.txt inside each download. Production or commercial use needs a separate licence.

This repository contains documentation and releases only. The software is closed source.

Contact

Feedback, bugs and commercial licensing: [email protected]. Bug reports are welcome as issues.

© 2026 Aethelgard Finance Ltd, registered in England and Wales (Company No. 17173295).

Source: README.md at commit f19537d

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v0.1.1LatestOct 9, 2026

Score

40% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

    Declare a license in the repository or the registry entry.