What is banktivity-swift-mcp CLAUDE.md?

Repository instructions for Banktivity Swift MCP, a Swift server and command-line tool that reads and writes Banktivity personal-finance vault files. It includes build, installation, signing, running, and testing guidance.

Use it to build or run the MCP server and CLI, install their binaries, list accounts in a vault, and run the project’s tests.

It gives a coding assistant the project-specific commands and constraints needed to work on the repository safely, including how to preserve vault tracking for CloudKit sync.

How sflinter/banktivity-swift-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to sflinter/banktivity-swift-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/sflinter/banktivity-swift-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/sflinter/banktivity-swift-mcp

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/sflinter/banktivity-swift-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/sflinter/banktivity-swift-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/sflinter/banktivity-swift-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/sflinter/banktivity-swift-mcp/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/sflinter/banktivity-swift-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/sflinter/banktivity-swift-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,077 This file is loaded in full into every session.

When invoked 2,077 The same file — it is already loaded in full.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.02077	$0.02077
Opus 5	$0.01038	$0.01038
Sonnet 5	$0.00415	$0.00415
Haiku 4.5	$0.00208	$0.00208

Measured 9d ago against content hash 221d9d040085, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

banktivity-swift-mcp CLAUDE.md scanned grade A with 1 finding 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

let tx = try context.fetch(request)

CLAUDE.md · 123 lines

How it starts

The opening of the file, as written. The whole thing — 123 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/code) when working with code in this repository.

What This Is

A Swift MCP (Model Context Protocol) server and CLI for Banktivity personal finance vaults. It reads and writes .bank8 files using Core Data's NSPersistentContainer, ensuring changes are properly tracked for CloudKit sync. This replaces an earlier TypeScript implementation that used direct SQL and corrupted vaults.

Build & Run

swift build                    # Debug build
swift build -c release         # Release build

# Install binaries
cp .build/release/banktivity-mcp ~/.local/bin/
cp .build/release/banktivity-cli ~/.local/bin/
codesign -fs - ~/.local/bin/banktivity-mcp   # Re-sign after copy
codesign -fs - ~/.local/bin/banktivity-cli

# Run MCP server
BANKTIVITY_FILE_PATH="/path/to/file.bank8" swift run banktivity-mcp

# Run CLI
BANKTIVITY_FILE_PATH="/path/to/file.bank8" swift run banktivity-cli accounts list
swift run banktivity-cli --vault "/path/to/file.bank8" accounts list

Testing

Tests use Swift Testing framework (import Testing). The Command Line Tools don't ship Testing or XCTest, so tests must run with the Xcode toolchain:

DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer \
SDKROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk \
DYLD_FRAMEWORK_PATH=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks \
swift test \
  -Xswiftc -F -Xswiftc /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks \
  -Xlinker -rpath -Xlinker /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks

Integration tests require a Banktivity vault at ~/Documents/Banktivity/Steves Accounts MCP.bank8. Tests copy it to /tmp before each run and skip gracefully if the vault is missing.

Architecture

Read the full file on GitHub · 123 lines

Changes

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 · 123 lines · 2,077 tokens per session scan A 221d9d040085

Subscribe to this mod's changes

banktivity-swift-mcp CLAUDE.md is an instructions file published in the GitHub repository sflinter/banktivity-swift-mcp (19 stars, last pushed 3mo ago), licensed MIT. It adds 2,077 tokens to every session, about $0.0104 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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banktivity-swift-mcp: Instructions file for Claude Code