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Harness
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Skills, MCP servers, prompts, assistants and connectors. Every listing shows its author, version and the permissions it needs.
On the shelves21,000
- MCP servers18,849
- Skills1,282
- Assistants651
- Prompts218
0 items
CodingSpecialist assistants, also called subagents. Installed in Claude Code, Codex and the like, they take on the work their main session hands them.
- Security Auditoraddyosmani 103kSecurity engineer focused on vulnerability detection, threat modeling, and secure coding practices. Use for security-focused code review, threat analysis, or hardening recommendations.SecurityCoding
- Senior Code Revieweraddyosmani 103kSenior code reviewer that evaluates changes across five dimensions — correctness, readability, architecture, security, and performance. Use for thorough code review before merge.SecurityCodingArchitecture
- Elixir prowshobson· functional-programming 40kWrite idiomatic Elixir code with OTP patterns, supervision trees, and Phoenix LiveView. Masters concurrency, fault tolerance, and distributed systems.Same as sessionCoding
- Refactor & Dead Code Cleaneraffaan-m 275kDead code cleanup and consolidation specialist. Runs analysis tools (knip, depcheck, ts-prune) to identify dead code and safely removes it.SonnetCoding
- TDD guideaffaan-m 275kTest-Driven Development specialist enforcing write-tests-first methodology. Ensures 80%+ test coverage.SonnetCoding
- Architectaffaan-m 275kSoftware architecture specialist for system design, scalability, and technical decision-making.OpusCodingArchitecture
- Application Security Engineermsitarzewski 158kAppSec specialist who secures the software development lifecycle through threat modeling, secure code review, SAST/DAST integration, and developer security education that makes secure code the default.SecurityEducationCoding
- Planneraffaan-m 275kExpert planning specialist for complex features and refactoring. Automatically activated for planning tasks.OpusCoding
- Legacy modernizerwshobson· code-refactoring 40kRefactor legacy codebases, migrate outdated frameworks, and implement gradual modernization. Handles technical debt, dependency updates, and backward compatibility.SonnetCoding
- C prowshobson· systems-programming 40kWrite efficient C code with proper memory management, pointer arithmetic, and system calls. Handles embedded systems, kernel modules, and performance-critical code.OpusMemoryCoding
- Minimal Change Engineermsitarzewski 158kEngineering specialist focused on minimum-viable diffs — fixes only what was asked, refuses scope creep, prefers three similar lines over a premature abstraction. The discipline that prevents bug-fix PRs from becoming refactor avalanches.Coding
- DevOps troubleshooterwshobson· cicd-automation 40kExpert DevOps troubleshooter specializing in rapid incident response, advanced debugging, and modern observability. Masters log analysis, distributed tracing, Kubernetes debugging, performance optimization, and root cause analysis. Handles production outages, system reliability, and preventive monitoring.SonnetDevOpsMonitoringCoding
- Skill Extractoralirezarezvani· self-improving-agent 28kTransforms a proven pattern or debugging solution into a standalone, portable skill package. Generates `SKILL.md` with proper frontmatter, reference docs, and examples that work in any project (no hardcoded paths or project-specific values). Spawned by `/si:extract` when a recurring solution should become reusable.Same as sessionDocumentationCoding
- Code review preshipmentwshobson· operating-kit 40kComprehensive pre-ship review of all changes since the last deploy or a specified commit. Walks correctness, atomicity and race conditions, error handling, data-store hygiene, security, type safety, tests, integration, performance, and observability. Use after any sprint and always before deploying. Ends with a SHIP / SHIP WITH FIXES / DO NOT SHIP verdict.SonnetMonitoringSecurityCoding
- Test Automation Engineermsitarzewski 158kExpert end-to-end test automation engineer for Playwright and Cypress — resilient selectors, flake elimination, isolated test data, CI parallelization, and trace-driven failure debugging.Browser automationTestingCoding
- Python prowshobson· python-development 40kMaster Python 3.12+ with modern features, async programming, performance optimization, and production-ready practices. Expert in the latest Python ecosystem including uv, ruff, pydantic, and FastAPI.OpusBackendCoding
- TDD orchestratorwshobson· backend-development 40kMaster TDD orchestrator specializing in red-green-refactor discipline, multi-agent workflow coordination, and comprehensive test-driven development practices. Enforces TDD best practices across teams with AI-assisted testing and modern frameworks.OpusTestingCodingAgents
- Experiment Runneralirezarezvani· autoresearch-agent 28kRuns one iteration of an autoresearch experiment loop. Reads experiment state from .autoresearch/{domain}/{name}/, makes exactly ONE change to the target file, commits it, evaluates via run_experiment.py, and reports KEEP / DISCARD / CRASH. Spawned per iteration by /ar:run and /ar:loop. Never modifies the evaluator. Not for general refactoring or multi-change edits.Coding
- .NET architectwshobson· dotnet-contribution 40kExpert .NET backend architect specializing in C#, ASP.NET Core, Entity Framework, Dapper, and enterprise application patterns. Masters async/await, dependency injection, caching strategies, and performance optimization.SonnetBackendCodingArchitecture
- Rust Refactoring Specialistmsitarzewski 158kExpert Rust engineer for repository-scale refactoring, safe renames, module restructuring, duplication removal, panic hardening, ownership improvements, and compiler or Clippy remediation.Coding
- Rust prowshobson· systems-programming 40kMaster Rust 1.75+ with modern async patterns, advanced type system features, and production-ready systems programming. Expert in the latest Rust ecosystem including Tokio, axum, and cutting-edge crates.OpusCoding
- Debuggerwshobson· debugging-toolkit 40kDebugging specialist for errors, test failures, and unexpected behavior. Use proactively when encountering any issues.SonnetCoding
- C# prowshobson· jvm-languages 40kWrite modern C# code with advanced features like records, pattern matching, and async/await. Optimizes .NET applications, implements enterprise patterns, and ensures comprehensive testing.Same as sessionTestingCoding
- Type design analyzeranthropics· pr-review-toolkit 38kUse this agent when you need expert analysis of type design in your codebase. Specifically use it (1) when introducing a new type to ensure it follows best practices for encapsulation and invariant expression, (2) during pull request creation to review all types being added, and (3) when refactoring existing types to improve their design quality. The agent will provide both qualitative feedback and quantitative ratings on encapsulation, invariant expression, usefulness, and enforcement. See "When to invoke" in the agent body for worked scenarios.Same as sessionGit and GitHubCoding