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Agent skill

Mpp Agent

by Luciole-Studio in Luciole-Studio/Misaka-Agent

Pay HTTP 402 APIs via Machine Payments Protocol (MPP). An agent skill from Luciole-Studio/Misaka-Agent.

MITAuto-check passed

Install Mpp Agent

skills CLI
$ npx skills add Luciole-Studio/Misaka-Agent --skill mpp-agent -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install Luciole-Studio/Misaka-Agent mpp-agent --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/Luciole-Studio/Misaka-Agent.git skills-src && mkdir -p .claude/skills && cp -r skills-src/misaka/core/skills/assets/optional/payments/mpp-agent .claude/skills/mpp-agent && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
mpp-agent
GitHub stars
125
Used in
2 other repos
Token cost
~1.3k tokens
SKILL.md length
617 words
Files
1
Skills in repo
76
Repo updated
First seen
Licence
MIT

At a glance

Pay HTTP 402 APIs via Machine Payments Protocol (MPP). An agent skill from Luciole-Studio/Misaka-Agent.

  • Works in 4 steps: Install + create an account → Inspect the merchant's 402 challenge → Pay the request → …
  • SKILL.md covers When to Use, Choosing a client, Prerequisites and Procedure (mppx, fastest path), plus 3 more sections
  • Calls npm, curl and npx; reaches tempo.xyz and agents.privy.io

What it does

Mpp Agent is an agent skill from Luciole-Studio/Misaka-Agent. Pay HTTP 402 APIs via Machine Payments Protocol (MPP).

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with Stripe. The repository describes itself as: A multi-agent research system for the humanities and social sciences. The licence is MIT.

Example prompts

  • “/mpp-agent”

Requirements

  • Node.js

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. Install + create an account
  2. Inspect the merchant's 402 challenge
  3. Pay the request
  4. Verify the receipt

What it can do on your machine

Read from SKILL.md and the folder at commit 77871d7. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • npm
    • curl
    • npx

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • tempo.xyz
    • agents.privy.io
    • agentcash.dev

    Also links to:

    • mpp.dev
    • wallet.tempo.xyz

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Mpp Agent loads about 1.3k tokens when it runs. Until then it costs about 16 tokens; SKILL.md has 617 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~16
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Luciole-Studio/Misaka-Agent at commit 77871d7, republished under its MIT licence (© Luciole-Studio). 617 words, ~1,261 tokens.

Download SKILL.mdSave it as .claude/skills/mpp-agent/SKILL.md (or your agent's skills folder).
name
mpp-agent
description
Pay HTTP 402 APIs via Machine Payments Protocol (MPP).
version
0.1.0
author
Teknium (teknium1), Hermes Agent
license
MIT
platforms
linux, macos

MPP Agent Skill

Wraps the Machine Payments Protocol (MPP, https://mpp.dev) clients so Hermes can pay for per-request API access against servers that respond with HTTP 402 Payment Required.

Three client options, all distributed via npm. Pick the lightest one that solves the user's need. Gated [linux, macos] while the broader payments tooling matures on Windows.

When to Use

  • A merchant API returns HTTP 402 with a www-authenticate header — and the user wants to actually pay it, not just log the response.
  • The user asks to "pay per request", "set up an agent wallet", "use Tempo / Privy / AgentCash", or wants to discover MPP-priced services.
  • A Stripe Link spend has produced a Shared Payment Token (SPT) and the agent needs to attach it to the 402 challenge — in that flow, prefer link-cli mpp pay (see the stripe-link-cli skill).

Choosing a client

ToolWhenSetup
link-cliUser already has Stripe Link set up, or the 402 challenge advertises method="stripe"see the stripe-link-cli skill
Tempo WalletMPP services with spend controls, service discoverytempo wallet login
Privy Agent CLIMulti-chain wallets, browser-based fundingprivy-agent-wallets login
AgentCash300+ pre-priced APIs via one USDC.e balancenpx agentcash onboard
mppxDev + debugging, smallest dep surfacenpm install -g mppx then mppx account create

Default: if the user already has Stripe Link configured or the 402 challenge specifies method="stripe", use link-cli mpp pay (the stripe-link-cli skill). Otherwise mppx for one-off paid calls and debugging, and Tempo Wallet when the user wants persistent spend controls.

Prerequisites

  • Node.js 20+ on PATH
  • A funded wallet (Tempo / Privy / AgentCash) OR an mppx account
  • For Tempo / Privy / AgentCash: follow their respective onboarding skills:
    • https://tempo.xyz/SKILL.md
    • https://agents.privy.io/skill.md
    • https://agentcash.dev/skill.md

Use web_extract to fetch any of those SKILL.md files if the user picks one.

Procedure (mppx, fastest path)

Run all commands through the terminal tool.

1. Install + create an account
npm install -g mppx
mppx account create

Store the resulting account credentials wherever the CLI tells you (the CLI writes them under its own config — do not paste them into the agent transcript).

2. Inspect the merchant's 402 challenge

If the user gives you a URL, probe it first to confirm it actually speaks MPP:

curl -i <url>

A real MPP 402 looks like:

HTTP/1.1 402 Payment Required
www-authenticate: tempo amount=0.1 currency=...
3. Pay the request
mppx <url>

For non-GET methods or request bodies:

mppx <url> --method POST --data '<json>'

mppx handles the 402 challenge/credential dance automatically and prints the merchant's actual response on success.

Show full SKILL.md (235 more words)Show less
4. Verify the receipt

mppx attaches the receipt header automatically. To inspect:

mppx <url> -v

Procedure (Tempo Wallet)

The Tempo Wallet skill at https://tempo.xyz/SKILL.md is the canonical reference; fetch it with web_extract and follow it. Headline:

tempo wallet login
tempo wallet pay <url>

Spend controls and service discovery live in the wallet UI at https://wallet.tempo.xyz.

Pitfalls

  • HTTP 402 without method="stripe" cannot be paid by Stripe Link. If the challenge advertises only Tempo / other methods, use mppx (or whichever wallet matches) — Link will reject it. Conversely, if it advertises method="stripe", prefer Link via the stripe-link-cli skill so the spend goes through the user's approved card.
  • Multiple challenges in one header. www-authenticate may list several methods (e.g. tempo, stripe). The Link CLI's mpp decode will pick the Stripe one; mppx will pick Tempo. There's no single "right" client — pick by which wallet the user has funded.
  • Zero-amount challenges. Some MPP endpoints charge $0.00 and just want a proof credential. These work without a funded wallet. Don't refuse them as "broken."
  • Wallet keys never enter agent context. All four clients store keys under their own config dirs (or generate per-session ephemeral keypairs, in Privy's case). Do not cat/read_file them.
  • Server-side MPP is a different skill. If the user wants to ADD 402 to their own API, this skill is wrong — point them at https://mpp.dev/quickstart/server and the mppx/nextjs / mppx/hono / mppx/express / mppx/elysia middlewares. A dedicated mpp-server skill may land later.

Verification

mppx --version && mppx account list

Exit code 0 means installed and an account exists.

© Luciole-Studio, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in misaka/core/skills/assets/optional/payments/mpp-agent of Luciole-Studio/Misaka-Agent.

Open the folder on GitHubat commit 77871d7

Used in 2 other repositories

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in Luciole-Studio/Misaka-Agent, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Mpp Agent next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Mpp Agent compared with similar skills
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Mpp Agent this skillLuciole-Studio/Misaka-Agent1252 repos~1.3kAutomated safety check: PassMIT
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Get API Docs with chubandrewyng/context-hub14k2 repos~775Automated safety check: PassMIT
Minimax PDFpoco-ai/poco-claw1.4k6 repos~2.1kAutomated safety check: PassMIT
Stripe Projectsfossasia/eventyay1.7k5 repos~2kAutomated safety check: NotesApache-2.0
Effect Client WrapperUsefulSoftwareCo/executor4.1k1 repos~1.4kAutomated safety check: PassMIT

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Works with

Questions about Mpp Agent

What does Mpp Agent do?

Pay HTTP 402 APIs via Machine Payments Protocol (MPP). An agent skill from Luciole-Studio/Misaka-Agent. Mpp Agent is an agent skill from Luciole-Studio/Misaka-Agent. Pay HTTP 402 APIs via Machine Payments Protocol (MPP).

How do I install Mpp Agent in Claude Code?

Run `npx skills add Luciole-Studio/Misaka-Agent --skill mpp-agent -a claude-code`. Or copy the skill folder (misaka/core/skills/assets/optional/payments/mpp-agent in Luciole-Studio/Misaka-Agent) into .claude/skills/mpp-agent in your project. Claude Code loads it when a task matches its description.

How do I install Mpp Agent in Codex?

Run `npx skills add Luciole-Studio/Misaka-Agent --skill mpp-agent -a codex`. Or copy the skill folder (misaka/core/skills/assets/optional/payments/mpp-agent in Luciole-Studio/Misaka-Agent) into .agents/skills/mpp-agent in your project. Codex loads it when a task matches its description.

Can I use Mpp Agent in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Luciole-Studio/Misaka-Agent --skill mpp-agent -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mpp-agent, .gemini/skills/mpp-agent, .github/skills/mpp-agent and .opencode/skills/mpp-agent in your project.

What does Mpp Agent need to run?

Going by SKILL.md and its folder, Mpp Agent needs the command-line tools its instructions call (npm, curl and npx). Our summary lists: Node.js.

Does Mpp Agent access the network?

SKILL.md names 5 domains. In commands or code: tempo.xyz, agents.privy.io and agentcash.dev; the agent is likely to contact these when it follows the instructions. As links in the text: mpp.dev and wallet.tempo.xyz. This is read from the text; nothing was executed.

Is Mpp Agent safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Mpp Agent use?

Mpp Agent is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Mpp Agent use?

About 1.3k tokens (SKILL.md is roughly 5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Mpp Agent?

Skills that share tags, products or a category with Mpp Agent: Firecrawl Build Onboarding (firecrawl/firecrawl, 189k stars), Get API Docs with chub (andrewyng/context-hub, 14k stars), Minimax PDF (poco-ai/poco-claw, 1.4k stars) and Stripe Projects (fossasia/eventyay, 1.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Mpp Agent?

Luciole-Studio (a GitHub organization) maintains it in Luciole-Studio/Misaka-Agent, which has 125 GitHub stars. The repository holds 76 skills in this directory. The repository was last updated on October 7, 2026.

Source: Luciole-Studio/Misaka-Agent on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.