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Integrate with Adyen's payment platform from Claude — create payment sessions and links, cancel/refund payments, manage terminals, webhooks, API credentials, and merchant accounts — with the official Adyen Model Context Protocol server covering Checkout and Management APIs.

MIT-licensed Go implementation of the Model Context Protocol for building MCP servers and clients with tools, resources, prompts, stdio, SSE, Streamable HTTP, hooks, session management, validation, sampling, roots, and tracing.

Open-source Python and TypeScript SDK for building model-driven AI agents with any model provider, MCP tools, streaming, multi-agent patterns, structured output, observability, hooks, guardrails, and production deployment guidance.

PreToolUse Bash guardrail implementing the Claude Code hooks guide drop-table example: exit 2 with stderr feedback when Bash command text contains a case-insensitive DROP TABLE pattern.

MCP server and CLI for Ruflo's multi-agent Claude Code and Codex workflow harness, exposing tools for swarms, agents, memory, hooks, daemons, plugins, federation, and project automation.

Official Resend MCP server for giving Claude and other MCP clients controlled access to email sending, received email, contacts, broadcasts, domains, segments, topics, API keys, and webhooks through stdio or Streamable HTTP.

SessionStart hook that prints a daily Claude Code retro at the top of every session — competency grade (0–100, A–F), 14-day efficiency sparklines, and a year-long contributions heatmap.

Remote MCP server for X and Twitter automation: tweet search, profile timelines, follower export, media workflows, webhooks, and confirmation-gated write actions.

MIT-licensed Agent Skill for persistent file-based planning across Claude Code, Codex, Cursor, Gemini CLI, OpenCode, Hermes Agent, OpenClaw, Kiro, and other SKILL.md-compatible coding agents, with task_plan.md, findings.md, progress.md, hooks, session recovery, attestation, and opt-in long-running run modes.

PostToolUse hook that flags risky package-lock.json, yarn.lock, and pnpm-lock.yaml edits: missing lockfile updates, unexpected registry hosts, and dependency count spikes before merge.

PreToolUse Write and Edit guardrail combining the hooks guide protected-file pattern with a local scan for common hardcoded credential shapes called out by GitHub secret scanning guidance before content is written.

PreToolUse hook that reviews proposed writes to MCP configuration files and blocks inline credential values, credential-bearing URLs, and broad filesystem roots before they are saved.

PreToolUse hook that blocks edits adding remote MCP server URLs unless their host appears in an explicit allowlist, reducing accidental connection to unreviewed OAuth, SSE, or Streamable HTTP MCP endpoints.

PreToolUse hook that reviews proposed Bash commands for package, installer, and archive downloads, then blocks curl or wget download commands that do not include an adjacent checksum or signature verification step.

Read-only Claude Code Stop hook that checks the current GitHub pull request title against a Conventional Commits style pattern before the session ends, then falls back to the latest commit subject when no PR title is available.

PreToolUse hook that scans proposed writes to prompt, agent, rule, markdown, and context files for common prompt-injection phrases before the content is saved into an AI-readable surface.

Read-only Claude Code PostToolUse hook that runs Biome's formatter, linter, and import-sorting checks on edited JavaScript, TypeScript, JSON, CSS, and GraphQL files without auto-writing changes.

Read-only Claude Code PostToolUse hook that checks edited Cloudflare Wrangler config files for required Worker fields, environment inheritance traps, secret-like vars, deprecated Workers Sites usage, and source-of-truth drift before Claude continues.

Read-only Claude Code PostToolUse hook that runs Hadolint diagnostics after Claude writes or edits Dockerfile-like files, surfacing Dockerfile best practice, inline shell, trusted registry, label, and configuration findings without rewriting files.

PostToolUse hook that watches dependency manifest and lockfile edits, then prompts or runs an OSS Review Toolkit dependency license analysis.

Read-only Claude Code PostToolUse hook that runs ShellCheck diagnostics after Claude writes or edits shell scripts, reporting shell portability, quoting, expansion, error-handling, and command-safety issues without modifying files.

Read-only Claude Code PostToolUse hook that runs shfmt diff checks after Claude writes or edits shell scripts, surfacing POSIX shell, Bash, Zsh, and mksh formatting drift without rewriting files or executing scripts.

PostToolUse hook that compares a just-edited OpenAPI or JSON Schema document against the version committed in git and warns about backward-incompatible drift — removed OpenAPI paths and removed required properties — so breaking API changes are surfaced before they ship. Advisory only; it never blocks the edit.

PreToolUse hook that inspects a database migration before it is written and blocks irreversible or lock-heavy operations — DROP TABLE/COLUMN, TRUNCATE, table/column RENAME, and CREATE INDEX without CONCURRENTLY — following the strong_migrations safe-migration checks.

PostToolUse hook that flags two review hazards as Claude writes files: edits to generated or vendored artifacts (lockfiles, minified bundles, source maps, dist/build output, snapshots, protobuf output) and oversized diffs that change more lines than a configurable threshold versus the committed version.

PostToolUse hook that inspects an edited npm package-lock.json for supply-chain provenance risk rather than known CVEs — dependencies resolved from outside the public npm registry (git, alternate-registry, or insecure transports) and registry tarballs missing an integrity hash.

PreToolUse hook that scans the exact text Claude Code is about to write or edit for high-confidence secret formats (AWS access keys, GitHub tokens, OpenAI keys, Slack tokens, Google API keys, Stripe keys, and private key blocks) and blocks the write with a non-zero exit before the secret ever reaches disk.

PostToolUse hook that keeps a project's README in sync with the code. When the README or package.json is edited it checks for the standard-readme core sections (Install and Usage) and verifies that the CLI commands exposed via package.json bin are documented. Advisory only; it never edits files.

PostToolUse hook that catches unintended UI changes by pixel-diffing a just-saved screenshot against its baseline with odiff.

Open-source agent engineering framework for building LLM applications with agents, model abstractions, tools, middleware, RAG, streaming, memory, MCP adapters, LangGraph-backed execution, and LangSmith observability hooks.