A Git-based API client and testing tool that stores requests as plain-text .bru files in your code repository. It can run API tests from its desktop app or command line, including in automated build checks.

Use it to write API requests, set up authentication and request scripts, run collections, and execute tests in continuous integration pipelines.

Keeping requests in text files makes them easier to review and version with code, while command-line runs support repeatable checks.

bruno — Skill for Claude Code by alivirgo

Install

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.

Any agent

npx skills add alivirgo/Major-AI-Skills --skill bruno

Clone the repo

git clone --depth 1 https://github.com/alivirgo/Major-AI-Skills

Made for: Claude Code.

Or install mas-desktop-ops, the plugin that ships this one along with the rest of its 7 skills.

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/skills/alivirgo/major-ai-skills/bruno/github.svg)](https://agentmods.dev/skills/alivirgo/major-ai-skills/bruno)

Your own site

<a href="https://agentmods.dev/skills/alivirgo/major-ai-skills/bruno"><img src="https://agentmods.dev/badge/skills/alivirgo/major-ai-skills/bruno/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/skills/alivirgo/major-ai-skills/bruno"><img src="https://agentmods.dev/badge/skills/alivirgo/major-ai-skills/bruno.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,673 The whole file, excluding the scripts and references it only reads on demand.

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	$0.00046	$0.01673
Opus 5	$0.00023	$0.00837
Sonnet 5	$0.00009	$0.00335
Haiku 4.5	$0.00005	$0.00167

Measured 11d ago against content hash 1e74a9080a86, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

bruno 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 11d 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.

plugins/mas-desktop-ops/skills/bruno/SKILL.md · 144 lines

How it starts

The opening of the file, as written. The whole thing — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Bruno API Client AI Skill Guide (Claude)

Overview & Engine Architecture

Bruno is an offline-first, Git-native open-source API client and testing platform. Unlike Postman or Insomnia, Bruno stores API collections directly as plain-text Bru markup files (.bru) within your repository, enabling seamless version control, zero cloud vendor lock-in, and automated CI/CD execution via the Bruno CLI (@usebruno/cli). Claude operates as an API Architecture Specialist and QA Automation Lead, specializing in declarative .bru file authoring, JavaScript pre-request and post-response scripting (bru.*, req.*, res.*), OAuth2/JWT token lifecycle management, and automated headless CI test runners.

Bruno File Architecture & Execution Pipeline

┌─────────────────────────────────────────────────────────────┐
│                 Bruno System Architecture                   │
│                                                             │
│  Git-Native Collection Hierarchy                            │
│  ├── `bruno.json` (Collection root descriptor & settings)   │
│  ├── `environments/*.bru` (Plaintext & Secret Variables)    │
│  └── `folder/request.bru` (Declarative Bru Markup DSL)      │
│                                                             │
│  Runtime & Execution Engine                                 │
│  ├── Node.js / Electron Sandboxed V8 JavaScript Runtime     │
│  ├── Axios HTTP Transport Engine                            │
│  └── `@usebruno/cli` (Headless CI/CD Test Suite Runner)     │
└─────────────────────────────────────────────────────────────┘

Operational Capabilities & Agent Directives

Bru Markup DSL Authoring: Write clean, valid .bru request definitions including meta, get/post/put/delete, headers, auth, body:json, vars:pre-request, script:pre-request, and assert blocks.
Automated Token Chaining & Scripting: Author JavaScript post-response scripts to extract JWT bearer tokens from authentication responses and store them dynamically in collection variables (bru.setVar()).
Environment & Secret Isolation: Manage environment-specific configs (dev.bru, staging.bru, prod.bru), ensuring secrets are tagged with secret keywords and added to .gitignore.
CI/CD Test Runner Integration: Generate robust command-line invocation scripts using bru run with JUnit/JSON report outputs and strict failure threshold exit codes.

Read the full file on GitHub · 144 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.

11d ago First seen · 144 lines · 46 tokens per session scan A 1e74a9080a86

Subscribe to this mod's changes

bruno is a skill published in the GitHub repository alivirgo/Major-AI-Skills (1 stars, last pushed yesterday), licensed MIT. It adds 46 tokens to every session and 1,673 once invoked, about $0.0002 per session on Opus 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 2026-08-31.

Backend and APIs Testing agent-skills agentic-skills ai-agent-skills ai-agents api-testing bru-cli bru-markup bruno claude cross-platform graphql rest-api

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