What is phantom-agent-kit CLAUDE.md?

Coding instructions for adding Phantom Connect wallets to apps built with React, React Native, or browser JavaScript/TypeScript. They cover wallet connections, transactions, messages, payments, token access, and NFT minting.

Use them when building or editing an app that connects to Phantom wallets, signs or sends Solana transactions, manages wallet addresses, or uses Phantom Connect features.

They help avoid unsupported transaction methods, incorrect setup, duplicate browser SDK instances, and unsafe calls when a wallet is not connected.

How phantom/phantom-agent-kit configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to phantom/phantom-agent-kit. 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/phantom/phantom-agent-kit/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/phantom/phantom-agent-kit

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/phantom/phantom-agent-kit/claude-md/github.svg)](https://agentmods.dev/instructions/phantom/phantom-agent-kit/claude-md)

Your own site

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

Per session 680 This file is loaded in full into every session.

When invoked 680 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	$0.00680	$0.00680
Opus 5.5	$0.00272	$0.00272
Sonnet 5.5	$0.00136	$0.00136
Haiku 4.5	$0.00068	$0.00068

Measured 2mo ago against content hash b6c80cec7992, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

phantom-agent-kit 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 · 45 lines

How it starts

The opening of the file, as written. The whole thing — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Phantom Connect

Give your agent a wallet. Swap, sign, and manage addresses across Phantom's supported chains — and tap into Phantom's docs for context. This plugin also includes skills, rules, and agents to help scaffold wallet-connected apps with the Phantom Connect SDK across React, React Native, and vanilla JS/TS.

Works with both Cursor and Claude Code.

Skill

Use /phantom-connect to activate the Phantom Connect skill. It covers all three SDKs (React, React Native, Browser), transaction patterns, payments, token-gating, and NFT minting.

SDK Rules

Phantom SDK Best Practices

Always use signAndSendTransaction for sending transactions. NEVER use signTransaction — it is NOT supported for embedded wallets.
In React apps, wrap the application root in PhantomProvider with a valid config (appId, providers, addressTypes).
In vanilla JS/TS apps, initialize a single BrowserSDK instance as a singleton. Never create multiple instances.
Wrap connect(), signAndSendTransaction(), signMessage(), and other async SDK calls in try-catch blocks.
Check isConnected before signing or transaction operations.
Import AddressType from @phantom/browser-sdk only.
Register your app in Phantom Portal and use a real appId.

Solana Transaction Safety

Always use LAMPORTS_PER_SOL from @solana/web3.js for SOL-to-lamport conversion. Never hardcode 1000000000.
For time-sensitive transactions, add priority fees with ComputeBudgetProgram.setComputeUnitPrice().
Verify transaction status after sending with connection.getSignatureStatus() or connection.confirmTransaction().
Use devnet (https://api.devnet.solana.com) for testing, mainnet-beta (https://api.mainnet-beta.solana.com) for production.
Never expose private keys in code. Never ask users to input seed phrases or private keys.

Embedded Wallet Constraints

signTransaction and signAllTransactions are NOT supported for embedded wallets. Always use signAndSendTransaction.
Default spending limit: $1,000 USD per day per app per user.
Social login sessions persist 7 days from the last auth event. Handle session expiration gracefully.
Social login (Google, Apple) requires a valid appId from Phantom Portal.
React Native apps MUST import react-native-get-random-values as the very first import, before anything else.

Read the full file on GitHub · 45 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 · 45 lines · 680 tokens per session scan A b6c80cec7992

Subscribe to this mod's changes

phantom-agent-kit CLAUDE.md is an instructions file published in the GitHub repository phantom/phantom-agent-kit (23 stars, last pushed 2mo ago), licensed MIT. It adds 680 tokens to every session, about $0.0027 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.

Frontend React Web3 and blockchain

phantom-agent-kit CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
phantom-agent-kit CLAUDE.mdphantom/phantom-agent-kit	Instructions file	23	2mo ago	MIT	A	680	Claude Code
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langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
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deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

phantom-agent-kit: Instructions file for Claude Code