Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
git clone --depth 1 https://github.com/phantom/phantom-agent-kitWrote 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/rules/phantom/phantom-agent-kit/embedded-wallet-constraints)<a href="https://agentmods.dev/rules/phantom/phantom-agent-kit/embedded-wallet-constraints"><img src="https://agentmods.dev/badge/rules/phantom/phantom-agent-kit/embedded-wallet-constraints/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/rules/phantom/phantom-agent-kit/embedded-wallet-constraints"><img src="https://agentmods.dev/badge/rules/phantom/phantom-agent-kit/embedded-wallet-constraints.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 | $0.00274 | $0.00274 |
| Opus 5.5 | $0.00110 | $0.00110 |
| Sonnet 5.5 | $0.00055 | $0.00055 |
| Haiku 4.5 | $0.00027 | $0.00027 |
Grade A, and why
embedded-wallet-constraints 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 1mo 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.
What it actually says
Embedded Wallet Constraints
Unsupported Methods
signTransactionandsignAllTransactionsare NOT supported for embedded wallets. Always usesignAndSendTransactioninstead. Calling unsupported methods will throw a runtime error.
Spending Limits
- Default spending limit for embedded wallets is $1,000 USD per day per app per user. Design your UX to account for this limit and provide clear error messages if a transaction exceeds it.
Session Duration
- Social login sessions persist for 7 days from the last authentication event. After expiry, users must re-authenticate. Handle session expiration gracefully in your UI — check
isConnectedbefore operations and prompt re-login when needed.
Social Login Requirements
- Social login (Google, Apple) requires a valid
appIdfrom Phantom Portal. Without anappId, social login options will not appear.
React Native Polyfill
- React Native apps MUST import
react-native-get-random-valuesas the very first import in the entry file, before any other imports including the Phantom SDK. Failing to do this will cause crypto-related runtime errors.
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.
- 1mo ago First seen · 28 lines · 274 tokens per session scan A d319bbffccf4
embedded-wallet-constraints is a cursor rule published in the GitHub repository phantom/phantom-agent-kit (19 stars, last pushed 2mo ago), licensed MIT. It adds 274 tokens to every session, about $0.0011 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.
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