Harness tools
Tools your coding agent can call
Connect an MCP server, install a command-line program with checked downloads, or add a command or a hook to your harness. Every tool here names its source, its licence and what it may touch before your agent downloads it.
67 components in 6 groups, each at the exact version the library release of October 9, 2026 serves.
Browse by job
- MCP server settingsConnection entries for MCP servers, written for Claude Code, Codex, Cursor and OpenCode.
- Command-line programsInstall recipes with the published checksum for each platform, and a typed wrapper that checks the arguments before the program runs.
- Slash commandsSaved prompts your harness runs as a command: debugging, reviews, changelogs, audits, refactors and migrations.
- HooksScripts your harness runs before or after a step: block risky commands, check for secrets, enforce commit messages, and format or lint after an edit.
- Tested functionsOne upstream Python function at a time, copied with the code it needs and a test: validators, parsers and formatters your agent can import without adding a dependency.
- 3D and game file checkersStandard-library checkers for glTF and Godot files that catch what an engine would drop or misread.
How your agent uses them
- Your agent searches Baltor for the step it is on and gets names, sizes and licences, never file bodies.
- It picks one component at an exact version and reads its file list, where every file names its SHA-256 checksum.
- It downloads exactly those files into your project, where your harness finds them, and checks each one against its checksum.
Why it matters
Your agent spends less time searching and installing when the tool, its settings and its checks arrive together. Each download is one tool at an exact version, so a setup that works today works the same way next week.
Give your agent these components
Your harness downloads them through Baltor with Pro, $49 a month. Cancel any time from your account page.
More from Baltor
- Deterministic skillsSkills that give the same answer every time.
- Corner casesThe inputs that break code, ready to test.
- Stop starting from nothingFor a developer whose coding agent starts every task from nothing: give each step the guidance and reusable code it needs.
- Harness FilesSkills, instruction files, tools, hooks and settings your harness picks up: what they are, how a harness gets them, and the setup for each harness.
- Get set upConnect Claude Code, Codex, Cursor, OpenCode, VS Code or Pi over MCP, call the REST API, or give an agent a feed link. Then download your first file.
- Top MCP serversA task-focused MCP shortlist with dated GitHub popularity, setup sources and clear limits on quality and Baltor usage claims.
- Claude Code quickstartWhat you need, the .mcp.json entry to paste, the first search, the first download and the check that it worked, for Claude Code.