Best for · debugging · data checked 2026-11-15

Best MCP servers & Codex plugins for debugging

14 plugins in our catalog say they help with debugging. Here are the top 12, editor's picks first, then by GitHub stars. Most of them sit in Agent Workflows and Review & Testing.

Quick read on these 12: 11 have a permissive license, 8 got a push in the last 30 days, 0 install as a hosted MCP endpoint.

How to choose

Match the host first: Codex and Claude Code install commands differ, and the install line below shows which one each project targets.
Check where it runs. Hosted MCP endpoints are quicker to set up but send your requests to someone else's server.
Prefer a recent push and a real license (MIT or Apache-2.0) for anything you'll use at work.
Stars tell you how many people looked, not whether it works. Read the code before you install.

The list

1. e2e

Write, run, and debug end-to-end tests for web and mobile apps with agent skills and an MCP server.

★ 13,906 · Apache-2.0 · pushed 2026-11-15 (this week) · MCP server, skills · by tester-army

2. Aegis

An agentic skills framework & software development methodology that works: planning, TDD, debugging, and collaboration workflows.

★ 1,443 · MIT · pushed 2026-11-14 (this week) · skills · by GanyuanRan · alternatives

3. Mobile Dev (Callstack)

Build, run and debug iOS and Android apps from Codex or Claude Code, with live simulators, emulators and devices streamed beside the agent's chat; works with Expo, React Native and SwiftUI.

★ 238 · MIT · pushed 2026-11-13 (this week) · plugin · by callstackincubator · alternatives

claude plugin marketplace add https://github.com/callstackincubator/mobile-dev.git#release/claude

4. Langfuse Observability

Query traces, debug exceptions, analyze sessions, and manage prompts via MCP tools.

★ 113 · MIT · pushed 2026-11-06 (last 30 days) · MCP server · by avivsinai

claude mcp add \

Analyze git history to understand a codebase before reading any code — auto-scales by repo size and cross-references hotspots with bug magnets to surface high-risk files, bus factor, and team momentum.

★ 41 · MIT · pushed 2026-04-26 (203 days ago) · skills · by yujiachen-y

npx skills add yujiachen-y/codebase-recon-skill

6. Epic Harness

Auto-trigger quality skills + self-evolving agent harness — orbit (spec-to-ship), evolve (skill mutation), team (multi-agent), TDD, check, ship, simplify, debug, perf, secure.

★ 20 · Apache-2.0 · pushed 2026-11-12 (this week) · plugin, skills · by epicsagas · alternatives

/plugin marketplace add epicsagas/plugins

7. dejavu

Cross-session error gates that detect recurring tool-call failures and escalate remind to block, with one shared store across Codex, Claude Code, OpenCode, Gemini CLI, Cursor and more (MIT).

★ 16 · MIT · pushed 2026-11-08 (this week) · plugin · by WhiteBite

8. Quiver

21 development lifecycle skills and 20 review and debug agents for Codex, Claude Code, Cursor, and OpenCode, where every step writes its output to disk instead of leaving it in the chat.

★ 16 · MIT · pushed 2026-11-10 (this week) · plugin, skills · by yagizdo

/plugin marketplace add yagizdo/quiver

9. Praxis

Intent-driven workflow skills for coding agents: describe what done looks like, not the steps. Triage-first design keeps token costs low across design, TDD, debug, review, and release.

★ 12 · MIT · pushed 2026-09-01 (75 days ago) · plugin, skills · by ouonet · alternatives

claude plugins marketplace add ouonet/praxis

10. Dev Skills

Team workflow skills for specs, plans, TDD, debugging, verification, review, branch finishing, and design context.

★ 7 · MIT · pushed 2026-10-21 (last 30 days) · plugin, skills · by Jason-chen-coder

/plugin marketplace add https://github.com/Jason-chen-coder/dev-skills

11. hiway-kit

Discipline kit for coding agents with 17 skills for planning, automated implementation, testing, debugging, review and multi-session coordination, where work counts as done only when the project's own checks pass.

★ 3 · MIT · pushed 2026-11-11 (this week) · plugin, skills · by This-HW

/plugin install hiway-kit@anthropic-plugin-directory

12. Agentry Observability

Agent-native product analytics, error logging, and deploy attribution for coding agents through one HTTP API.

★ 2 · No license file · pushed 2026-07-13 (125 days ago) · plugin · by fr33dr4g0n

codex plugin marketplace add fr33dr4g0n/agentry-public

Matched by keywords in each project's own name and description. The topic comes from what people actually type into Google and Bing search boxes.

All comparisons and use cases →

Data from GitHub and each project's README, checked 2026-11-15. We haven't installed or audited these, and stars measure attention, not quality. Paid placements never change this page. Spot a mistake? hello@pickaplugin.com