What is fieldtheory-cli CLAUDE.md?

A project guide for Field Theory CLI, a local command-line program for synchronizing bookmarks from X and managing a personal library of saved notes. It describes the commands, stored data locations, build process, and main source files.

Use it when building, testing, running, or modifying Field Theory CLI features such as bookmark sync, search, classification, library workflows, and command installation.

It gives an agent the project structure and data flow needed to make changes safely. It also explains where bookmarks, library files, portable commands, and idea artifacts are stored.

How afar1/fieldtheory-cli configures Claude Code

About the project

Field Theory CLI is a command-line tool for syncing bookmarks locally, managing a Field Theory library, and making local context available to coding agents. It is intended for users of the Field Theory Mac app and agents such as Claude Code or Codex that can run shell commands. Its catalogue add-ons provide commands, instructions, and settings for using the CLI in agent workflows.

afar1/fieldtheory-cli · 2,055 stars · on GitHub · fieldtheory.dev

Reuse

Borrowing it

Nothing to install: this file belongs to afar1/fieldtheory-cli. 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/afar1/fieldtheory-cli/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/afar1/fieldtheory-cli

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/afar1/fieldtheory-cli/claude-md/github.svg)](https://agentmods.dev/instructions/afar1/fieldtheory-cli/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/afar1/fieldtheory-cli/claude-md"><img src="https://agentmods.dev/badge/instructions/afar1/fieldtheory-cli/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/afar1/fieldtheory-cli/claude-md"><img src="https://agentmods.dev/badge/instructions/afar1/fieldtheory-cli/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 610 This file is loaded in full into every session.

When invoked 610 The same file — it is already loaded in full.

Security scan A 0 findings. 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	$0.00610	$0.00610
Opus 5.5	$0.00244	$0.00244
Sonnet 5.5	$0.00122	$0.00122
Haiku 4.5	$0.00061	$0.00061

Measured 2mo ago against content hash 2612609c4d64, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fieldtheory-cli CLAUDE.md scanned grade A with 0 findings 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 66 lines

How it starts

The opening of the file, as written. The whole thing — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This is the Field Theory CLI: a local-first command-line companion for X bookmark sync, Field Theory Library workflows, portable commands, app install, and agent-facing context.

Commands

npm run build        # Compile TypeScript to dist/
npm run dev          # Run via tsx directly
npm run test         # Run tests
npm run start        # Run compiled dist/cli.js

Architecture

Single CLI application built with Commander.js. Bookmark data is stored in ~/.fieldtheory/bookmarks/; Library markdown is stored in ~/.fieldtheory/library/; portable commands live under ~/.fieldtheory/commands/; and Possible run artifacts live under ~/.fieldtheory/ideas/.

Key files

File	Purpose
`src/cli.ts`	Command definitions, progress bar, first-run UX
`src/paths.ts`	Data, library, and commands path resolution
`src/graphql-bookmarks.ts`	GraphQL sync engine (Chrome session cookies)
`src/bookmarks.ts`	OAuth API sync
`src/bookmarks-db.ts`	SQLite FTS5 index, search, list, stats
`src/bookmark-classify.ts`	Regex-based category classifier
`src/bookmark-classify-llm.ts`	Optional LLM classifier
`src/bookmarks-viz.ts`	ANSI terminal dashboard
`src/chrome-cookies.ts`	Chrome cookie extraction (macOS Keychain)
`src/xauth.ts`	OAuth 2.0 flow
`src/db.ts`	WASM SQLite layer (sql.js-fts5)
`src/library.ts`	Local Field Theory Library read/write helpers
`src/commands-files.ts`	Portable command file creation and validation
`src/app-open.ts`	Open Library pages in the packaged Mac app or a dev checkout
`src/app-install.ts`	Download and install packaged app releases
`src/skill.ts`	Install Field Theory agent skills for Claude Code and Codex
`src/ideas.ts`	Possible seeds, runs, jobs, and nightly schedules

Data flow

Chrome cookies → GraphQL API → JSONL cache → SQLite FTS5 index
                                    ↓
                           Regex classification
                                    ↓
                         Search / List / Viz

Read the full file on GitHub · 66 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.

2mo ago First seen · 66 lines · 610 tokens per session scan A 2612609c4d64

Subscribe to this mod's changes

fieldtheory-cli CLAUDE.md is an instructions file published in the GitHub repository afar1/fieldtheory-cli (2,055 stars, last pushed 2mo ago), licensed MIT. It adds 610 tokens to every session, about $0.0024 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

agent-tools bookmarks cli local-first markdown

fieldtheory-cli CLAUDE.md next to 6 instructions from other repositories
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fieldtheory-cli: Instructions file for Claude Code