Expensify/App is the source code for New Expensify, a financial collaboration application organized around chat. It is used by contributors building and testing the web, iOS, and Android versions of the application. Catalogue add-ons support development workflows such as mobile testing and agent-assisted work on the codebase.
Borrowing it
Nothing to install: this file belongs to Expensify/App. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Expensify/App/main/AGENTS.mdgit clone --depth 1 https://github.com/Expensify/AppWrote 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.
[](https://agentmods.dev/instructions/expensify/app/agents-md)<a href="https://agentmods.dev/instructions/expensify/app/agents-md"><img src="https://agentmods.dev/badge/instructions/expensify/app/agents-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.
<a href="https://agentmods.dev/instructions/expensify/app/agents-md"><img src="https://agentmods.dev/badge/instructions/expensify/app/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.01892 | $0.01892 |
| Opus 5.5 | $0.00757 | $0.00757 |
| Sonnet 5.5 | $0.00378 | $0.00378 |
| Haiku 4.5 | $0.00189 | $0.00189 |
Grade A, and why
App AGENTS.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 today.
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.
How it starts
The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md - Expensify App
CLAUDE.md only imports this file, so Claude Code and OpenCode share these instructions. Edit this file, not CLAUDE.md.
Coding Standards
CI enforces the app-coding-standards rules with the code-inline-reviewer agent. Follow these steps for every code change:
- Before writing or editing code, load the
app-coding-standardsskill (.claude/skills/app-coding-standards/SKILL.md) and read the full rule file inrules/for every rule category that applies to the files you touch (PERF-*,CONSISTENCY-*,CLEAN-REACT-PATTERNS-*,UI-*, andONYX-*).SKILL.mdis only an index: the conditions, exceptions, and required fixes are in the rule files. - Before committing or creating a PR, review your diff the same way CI does. Stage everything with
git add -A. Then start a general-purpose subagent, tell it to follow.claude/agents/code-inline-reviewer.md, and have it reviewgit diff --cached $(git merge-base origin/main HEAD)instead ofgh pr diff. That diff covers committed, staged, and new files since your branch leftmain. Don't call the reviewer by name: tools register agents only from the folder where the session started, which is usually the Expensidev root. If your tool cannot run subagents, follow the reviewer's instructions yourself. Fix every violation, or explain in the PR why an exception applies.
HybridApp Architecture
- The mobile application is built from the Mobile-Expensify submodule, not directly from the App repository.
- NewDot refers to the New Expensify App, OldDot or Expensify Classic refers to our Old expensify app and website
Key Integration Points
- App (NewDot) and Mobile-Expensify (OldDot) are combined into a single mobile application
- The HybridApp module (
@expensify/react-native-hybrid-app) manages transitions between OldDot and NewDot - Build process merges
.envfiles from both repositories - Mobile-Expensify environment variables supersede App variables
- Mobile builds must be initiated from the Mobile-Expensify directory
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.
- today Changed · +2 lines · +50 tokens per session 3de584f3fbb6
- yesterday Changed · +115 lines · +1,799 tokens per session 5f43fa8db81d
- 2mo ago First seen · 4 lines · 43 tokens per session scan A 4b8602b997dd
App AGENTS.md is an instructions file published in the GitHub repository Expensify/App (5,081 stars, last pushed today), licensed MIT. It adds 1,892 tokens to every session, about $0.0076 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.