mpp-agent
Pay HTTP 402 APIs via Machine Payments Protocol (MPP).
60
73%
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Medium
Suggest reviewing before use
Fix and improve this skill with Tessl
tessl review fix ./optional-skills/payments/mpp-agent/SKILL.mdSecurity
1 medium severity finding. This skill can be installed but you should review these findings before use.
W009: Direct money access capability detected (payment gateways, crypto, banking).
What this means
The skill is specifically designed for direct financial operations, giving the agent the ability to move money or execute financial transactions — such as payment processing, cryptocurrency operations, banking integrations, or market order execution.
Why it was flagged
The skill is explicitly designed to perform payments. It wraps Machine Payments Protocol clients and references specific payment tools/APIs (Stripe Link via link-cli, Tempo Wallet, Privy Agent CLI, AgentCash, and mppx) and concrete commands to "pay" (e.g., `link-cli mpp pay`, `tempo wallet pay <url>`, `mppx <url>`). These are direct financial execution capabilities (wallets, payment gateways, and on-chain/mpp payment flows).
Low
Low-risk findings.
2 low severity findings. Worth noting, but not necessarily harmful.
W011: Third-party content exposure detected (indirect prompt injection risk).
What this means
The skill exposes the agent to untrusted, user-generated content from public third-party sources, creating a risk of indirect prompt injection. This includes browsing arbitrary URLs, reading social media posts or forum comments, and analyzing content from unknown websites.
Why it was flagged
SKILL.md:51-62 directs the agent to probe a user-supplied URL at runtime (via curl) and thereby ingest the merchant’s HTTP 402 response headers (including `www-authenticate`) as readable text, which is outsider-authored free text that can include injection content.
W012: Unverifiable external dependency detected (runtime URL that controls agent).
What this means
The skill fetches instructions or code from an external URL at runtime, and the fetched content directly controls the agent’s prompts or executes code. This dynamic dependency allows the external source to modify the agent’s behavior without any changes to the skill itself.
Why it was flagged
The skill instructs the agent to "Use `web_extract` to fetch" external SKILL.md files at runtime (e.g., https://tempo.xyz/SKILL.md, https://agents.privy.io/skill.md, https://agentcash.dev/skill.md), meaning remote content would be fetched and then followed as agent instructions, so these URLs are runtime-controlled prompts.
- Repository
- NousResearch/hermes-agent
- Commit
6327930
- Audited
- Security analysis
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