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freetaxusa-mcp: Instructions file for Claude Code

CLAUDE.md

freetaxusa-mcp CLAUDE.md is an instructions file for Claude Code from schwarztim/freetaxusa-mcp. It costs 390 tokens per session, scanned B, original, MIT.

Repository instructions for an MCP server that automates FreeTaxUSA tax forms in a browser using Playwright. They describe login, page navigation, form actions, testing, and masking sensitive personal information.

In plain words
What is it for?
Building and running the tax-filing automation server, checking sessions, reading and submitting forms, navigating sections, and retrieving tax summaries or refund estimates.
Why use it?
They define how the browser session and form interactions should work while reducing exposure of sensitive data. They also distinguish implemented tools from planned ones.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is schwarztim/freetaxusa-mcp's own configuration. It tells Claude Code how to work on freetaxusa-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything freetaxusa-mcp configures →

not rated 10repo 1mo ago B scan 390 tokens original MIT
View source ↗ schwarztim/freetaxusa-mcp
Reuse

Borrowing it

Nothing to install: this file belongs to schwarztim/freetaxusa-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/schwarztim/freetaxusa-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/schwarztim/freetaxusa-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.

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README.md
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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.

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Per session 390 This file is loaded in full into every session.
When invoked 390 The same file — it is already loaded in full.
Security scan B 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00390 $0.00390
Opus 5.5 $0.00156 $0.00156
Sonnet 5.5 $0.00078 $0.00078
Haiku 4.5 $0.00039 $0.00039

Measured 2mo ago against content hash d0df85459f19, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

freetaxusa-mcp CLAUDE.md scanned grade B 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 2mo 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

- Browser profile chmod 0700
CLAUDE.md · 50 lines

What it actually says

FreeTaxUSA MCP Server

Browser automation MCP for FreeTaxUSA tax filing using Playwright.

Architecture

  • Transport: stdio
  • Browser: Playwright persistent Chromium context at ~/.freetaxusa-mcp/browser-profile/
  • Navigation: SID-based URL parameters (?sid=N), dynamically discovered from nav sidebar
  • Form interaction: Accessibility tree targeting (not CSS selectors)
  • Security: PII filter on all outputs (SSN masking, account number masking)
  • Concurrency: Async mutex prevents concurrent page operations

Commands

npm run build    # TypeScript compile
npm run start    # Run server (stdio)
npm run dev      # Run with tsx (development)
npm test         # Run unit tests

Tool Categories

Phase 1 (Implemented)

  • authenticate - Login with email/password
  • get_session_status - Check session state
  • read_current_page - Read form fields on current page
  • save_and_continue - Submit current page
  • navigate_section - Jump to section by name or SID
  • fill_taxpayer_info - Fill personal info
  • fill_filing_status - Set filing status
  • get_tax_summary - Return overview
  • get_refund_estimate - Refund/owed amount

Phase 2 (Stubbed)

  • fill_w2_income, fill_1099_income

Phase 3 (Stubbed)

  • fill_deductions, review_return, file_extension, get_form_status

Security

  • Credentials never stored to disk
  • PII filtered from all tool outputs
  • Browser profile chmod 0700
  • Anti-bot flags on browser launch
  • Session expiry detected on every tool call
  • State filing paywall detection
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.

  1. 2mo ago First seen · 50 lines · 390 tokens per session scan B d0df85459f19

Subscribe to this mod's changes

freetaxusa-mcp CLAUDE.md is an instructions file published in the GitHub repository schwarztim/freetaxusa-mcp (10 stars, last pushed 1mo ago), licensed MIT. It adds 390 tokens to every session, about $0.0016 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Browser automationFinance and fintechai-agentclaudefreetaxusamcpmodel-context-protocolplaywright
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