1,660 free skills
Debugging skills
Skills for systematic debugging — reproducing bugs, reading stack traces, bisecting regressions, and diagnosing flaky failures.
Sourced from real, public repositories — synced daily, never invented.
1,660 free skills
Skills for systematic debugging — reproducing bugs, reading stack traces, bisecting regressions, and diagnosing flaky failures.
Sourced from real, public repositories — synced daily, never invented.
15 tools across six categories
13 of them never send your data anywhere
Free · No signup · No trial clock
SEE THE DIRECTORY
test-generation
noorkhalel/saas-ai-skills
Generate or plan deterministic automated tests for existing behavior, regressions, APIs, UI, integrations, and edge cases. Use when tests are the primary deliverable. Do not use to debug the defect, review the implementation, or redesign the system.
ctf-reverse
takechan-0/ctf-skills-mirror
Provides reverse engineering techniques for CTF challenges. Use when the main job is to understand how a compiled, obfuscated, packed, or virtualized target works before exploiting or solving it, including binaries, APKs, WASM, firmware, custom VMs, bytecode, game clients, malware-like loaders, and anti-debug or anti-analysis logic. Do not use it when the vulnerability is already understood and the remaining task is exploitation; use pwn instead. Do not use it for pure web workflows, log or disk forensics, or standalone crypto problems unless reversing the implementation is the real blocker.
regex-visual-debugger
gked2121/claude-skills
Debug regex patterns with visual breakdowns, plain English explanations, test case generation, and flavor conversion. Use when user needs help with regular expressions or pattern matching.
khuym:debugging
hoangnb24/skills
Systematic debugging for blocked workers, test failures, build errors, runtime crashes, and integration issues. Invoked standalone ("debug this error") or by other skills (reviewing spawns debugger on UAT failure, executing invokes it on blocker). Reads history/learnings/critical-patterns.md to avoid re-solving known issues. Writes debug notes that compounding can later capture.
django-security-scan
dolphinllc/claude-security-skills
Defensive security scan for Django and Django REST Framework projects. Detects DEBUG=True in production, wildcard ALLOWED_HOSTS, SECRET_KEY in source, missing CSRF, raw ORM queries with string formatting, mark_safe on user input, AllowAny on mutating DRF views, and ModelSerializer fields="__all__" leaking sensitive fields. Invoke when the user asks to "review", "audit", or "scan" a Django project.
motor-pmsm-base
calebzu/pmsm-control-claude-skills-for-matlab
PMSM Simulation Modeling Base — entry-point skill for building three-phase voltage-source-inverter-driven PMSM (SPMSM/IPMSM) control simulations in Simulink. Provides plant build standard, dq frame conventions, building blocks library SOP, sanity-check templates, broken-FOC defense checklist, and visual review standards. Method-specific skills (motor-fcs-mpc / motor-dtc-pmsm / motor-smc-pmsm) layer their control law on this base. Use when starting a new PMSM control method study, designing a build script skeleton, or debugging broken-FOC symptoms (motor stalled, abc DC-locked). Skip for non-PMSM motors (induction / BLDC / SRM) or pure theory questions.
bio-single-cell-data-io
gptomics/bioskills
Read, write, create, and convert single-cell objects across AnnData (Python), Seurat (R), and SingleCellExperiment (R). Use when loading 10X Cell Ranger output (raw vs filtered), importing or exporting h5ad/RDS/h5mu/zarr, building AnnData or Seurat objects from matrices, moving objects between Python and R, or debugging lost layers, transposed matrices, or mangled gene names during conversion.
fw-ai-app-dev
freshworks-developers/fw-dev-tools
Expert-level skill for AI Actions and integrations on Freshworks Platform 3.0. Use when (1) Creating actions.json and SMI functions (flat request, nested response), (2) Request templates and third-party API integration, (3) Pre-build validation (pricing, paywalls, account prerequisites), (4) Failure-case validation and test data guardrails, (5) Debugging broken endpoints, (6) Integration implementation checklist (auth, base URL, request body, trigger-friendly schema), (7) Scoping and planning new integrations (and comparing only when user asks).
tracely
jwuthri/tracely
Instrument AI agents with Tracely and turn their production traces into CI gates. Use when the user mentions Tracely, tracely-ai, tracely_sdk, the `tracely` CLI, or asks to trace/observe an AI agent, add LLM evaluators or LLM-as-a-judge columns, debug why a trace or conversation isn't showing up, wire agent regression tests into a PR check, run scenario or red-team suites against an agent endpoint, or replay recorded agent failures in CI. Covers both zero-span-code automatic instrumentation and the manual span API.
stack
michaljuszczyk/skillforge
Use once per project to choose (greenfield) or record (brownfield) the tech stack as a durable decision before roadmap and building. Triggers on pick a stack, choose a framework, tech stack, or record or assess the existing stack.
sglang-bisect-ci-regression
sgl-project/sglang
Investigate consistently failing SGLang CI tests by extracting the failure signature from scheduled or rerun workflows, bisecting the passing/failing commit window, checking runner or hardware specificity, and optionally reproducing on a remote GPU host.
bisect-aware-instrumentation
arabelatso/skills-4-se
Instrument code to support efficient git bisect by producing deterministic pass/fail signals and concise runtime summaries for each tested commit. Use when debugging regressions with git bisect, automating bisect workflows, creating bisect test scripts, handling flaky tests during bisection, or needing clear exit codes and logging for automated bisect runs. Helps identify the exact commit that introduced a bug through automated testing.
debug
herbertjulio/specialist-agent
Use when encountering any bug, test failure, unexpected behavior, or error - before proposing fixes. Use especially when previous fix attempts have failed.
sf-debug
agentgill/sf-skills-public
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git
oornnery/agents
Git safety, staging, commit workflow, branching, pull requests, rebase, bisect, tagging, and worktrees. Load when working with branches, commits, PRs, or recovering from tricky git situations.
playwright-best-practices
sebfranklin/franklin-skills
Use when writing Playwright tests, fixing flaky tests, debugging failures, implementing Page Object Model, configuring CI/CD, optimizing performance, mocking APIs, handling authentication or OAuth, testing accessibility (axe-core), file uploads/downloads, date/time mocking, WebSockets, geolocation, permissions, multi-tab/popup flows, mobile/responsive layouts, touch gestures, GraphQL, error handling, offline mode, multi-user collaboration, third-party services (payments, email verification), console error monitoring, global setup/teardown, test annotations (skip, fixme, slow), test tags (@smoke, @fast, @critical, filtering with --grep), project dependencies, security testing (XSS, CSRF, auth), performance budgets (Web Vitals, Lighthouse), iframes, component testing, canvas/WebGL, service workers/PWA, test coverage, i18n/localization, Electron apps, or browser extension testing. Covers E2E, component, API, visual, accessibility, security, Electron, and extension testing.
memory-leak-debugging
morningstar0709/trae-agent-enhancements
Diagnose JavaScript, browser, and Node.js memory leaks in Trae with Chrome DevTools MCP and memlab-oriented workflows. Use when the user reports high memory usage, OOM errors, heap snapshots, detached DOM nodes, growing memory, or Chinese requests such as 内存泄漏, 内存占用高, 页面越用越卡, 分析 heapsnapshot, or 排查 Node 内存问题.
triage-leaked-infra
openshift/hypershift
Assess whether an AWS VPC or infra set from HyperShift CI is safe to delete. Use when the user pastes cleanleaked output and asks 'can I delete this?', 'is this safe to remove?', 'triage this infra', asks about a LEAKED or UNCERTAIN verdict, provides a VPC ID or infraID and wants to know if it's orphaned, or says 'check this VPC'. Also use when the user asks 'should I delete this?' about any AWS resource in the HyperShift CI account.
memory-leak
zeqinjie/flutter-skills
Find high-confidence Flutter and Dart memory leaks and lifecycle cleanup bugs during code review. Use when auditing pull requests, widget code, controllers, notifiers, timers, subscriptions, overlays, RouteObserver, VideoPlayerController, image streams, leak_tracker results, or other disposable objects for not-disposed or not-GCed leaks.
debugging-strategies
thinkfleetai/thinkfleet-engine
Systematic debugging: stack trace analysis, log-based diagnosis, bisecting regressions, memory leak detection, and profiling.
debugging-mastery
tawanorg/skills
>
debug-production-incident
debashis2007/cursor-production-skills
Structured triage → mitigation → root-cause flow for live production incidents. Use when a running system is degraded or down (errors, latency, outages) and you need to restore service safely and then find the cause.
debug
epicsagas/epic-harness
Systematic root-cause isolation for test failures, runtime errors, or unexpected behavior. Narrow hypothesis → verify → fix.
visual-mode
remotion-dev/remotion
Guidance for working on Remotion Studio Visual Mode, sequence identity, node paths, symbolicated stacks, override IDs, and hot reload behavior. Use when implementing or debugging visual editing of Sequences.
wiring-application-config
wdm0006/python-skills
Load, merge, and validate layered application configuration (defaults plus a user YAML/TOML/JSON file or a stored settings object) so a mis-wired or misspelled key fails loudly instead of silently reverting to the default — sections the code reads that exist nowhere, sections that exist but nothing reads, unvalidated recursive merges, `bool`-passes-as-`int`, defaults aliased by a shallow merge, falsy-but-valid values killed by `or`/`||`, partial write-backs that are stickier than a missing file, and bootstrap ordering that swallows the loader's own warnings. Use when adding a config key, writing or reviewing a config loader/merge/schema, reading a setting in a new module, persisting user settings, wiring logging from config, or debugging a setting that "has no effect".
regression-consistency-checker
arabelatso/skills-4-se
Checks whether a new version of a repository preserves the behavior observed by tests on the old version. Use this skill when comparing two versions of code to detect regressions, verify refactoring safety, validate bug fixes don't break existing functionality, or ensure backward compatibility. Detects differences in function outputs, exceptions, observable states, and performance between versions. Generates reports highlighting potential regressions (critical, high, medium, low severity), improvements, and areas requiring verification. Triggers when users ask to check for regressions between versions, compare test behavior across versions, verify behavior preservation, or validate that changes don't break existing tests.
playwright-testing
modsetter/surfsense
Use when writing Playwright tests, fixing flaky tests, debugging failures, implementing Page Object Model, configuring CI/CD, optimizing performance, mocking APIs, handling authentication or OAuth, testing accessibility (axe-core), file uploads/downloads, date/time mocking, WebSockets, geolocation, permissions, multi-tab/popup flows, mobile/responsive layouts, touch gestures, GraphQL, error handling, offline mode, multi-user collaboration, third-party services (payments, email verification), console error monitoring, global setup/teardown, test annotations (skip, fixme, slow), test tags (@smoke, @fast, @critical, filtering with --grep), project dependencies, security testing (XSS, CSRF, auth), performance budgets (Web Vitals, Lighthouse), iframes, component testing, canvas/WebGL, service workers/PWA, test coverage, i18n/localization, Electron apps, or browser extension testing. Covers E2E, component, API, visual, accessibility, security, Electron, and extension testing.
slack-development
getsentry/junior
Implement Slack bot behavior with correct Slack-documented message formats, inbound mention/event routing, and long-running task UX. Use when asked to "format Slack messages", "fix Slack markdown", "debug thread mentions", "improve Slack bot UX", "add streaming in Slack", or "build Slack Chat SDK behavior". Covers mrkdwn quirks, Events API payload patterns, routing guardrails, and Chat SDK implementation patterns.
using-medusa-cloud
medusajs/medusa-claude-plugins
Manages Medusa Cloud resources through the Cloud CLI (mcloud). Use when deploying, debugging deployments, managing environments, environment variables, or any Medusa Cloud operation. CRITICAL for mcloud commands, deployment failures, build logs, Cloud setup, and CI/CD workflows.
ci-test-failures
microsoft/aspire
Guide for diagnosing GitHub Actions test failures, extracting failed tests from runs, and creating or updating failing-test issues. Use this when asked to investigate GitHub Actions test failures, download failure logs, create failing-test issues, or debug CI issues.
unplugin-skilld
nuxt/scripts
Unified plugin system for build tools. ALWAYS use when writing code importing \"unplugin\". Consult for debugging, best practices, or modifying unplugin.
oxc-walker-skilld
nuxt/scripts
ALWAYS use when writing code importing \"oxc-walker\". Consult for debugging, best practices, or modifying oxc-walker, oxc walker.
python-async-best-practices
nathan-gage/python-skills
Async and concurrency best practices for Python — event-loop discipline, task lifecycle, bounded fan-out, and async generator cleanup. Triggers on writing or reviewing asyncio code, async def functions, create_task/gather/TaskGroup usage, semaphores and queues, async generators and streams, blocking-call audits, or debugging hangs, orphaned tasks, swallowed cancellations, and unraisable async warnings.
using-streamlit-session-state
streamlit/agent-skills
Using st.session_state to manage state across Streamlit reruns. Use when persisting data, handling widget state, implementing callbacks, or debugging state issues. Covers initialization patterns, widget-state association, and common gotchas.
temporal-developer
temporalio/cursor-temporal-plugin
Develop, debug, and manage Temporal applications across Python, TypeScript, Go, Java, .NET and Ruby. Use when the user is building workflows, activities, or workers with a Temporal SDK, debugging issues like non-determinism errors, stuck workflows, or activity retries, using Temporal CLI, Temporal Server, or Temporal Cloud, or working with durable execution concepts like signals, queries, heartbeats, versioning, continue-as-new, child workflows, or saga patterns. Also use when the user mentions "run a Temporal workflow from the CLI", "start a dev server", "run temporal server start-dev", "temporal workflow start", "temporal workflow execute", "temporal workflow signal", "temporal workflow query", "temporal workflow update".
cpp-server-crash-triage
hoatv2211/gamestudio-codexkit
Use when triaging a C++ game server crash, dump, access violation, segmentation fault, stack trace, symbols, or build identity into a stable signature and ranked root-cause plan.
rust-async-patterns
pedronauck/skills
Master Rust async programming with Tokio, async traits, error handling, and concurrent patterns. Use when building async Rust applications, implementing concurrent systems, or debugging async code.
identify
majiayu000/claude-skill-registry
Identify friction points, bottlenecks, bugs, and technical debt. Use for audits, debugging sessions, when something feels wrong, or before major work to surface hidden issues. This is the second system in the 5-system framework.
pi-logs
knoopx/pi
Query pi agent session logs using Nushell's structured data pipeline. Use when debugging sessions, analyzing tool usage, finding commands run, or tracking file access patterns.
pi-session-logs
knoopx/pi
Query pi agent session logs as JSON Lines using Nushell pipelines. Use when debugging agent sessions, analyzing tool calls, or tracking file access in session history.
golang-performance
mgrubb/agent-skills-golang
Golang performance optimization patterns and methodology - if X bottleneck, then apply Y. Covers allocation reduction, CPU efficiency, memory layout, GC tuning, pooling, caching, and hot-path optimization. Use when profiling or benchmarks have identified a bottleneck and you need the right optimization pattern to fix it. Also use when performing performance code review to suggest improvements or benchmarks that could help identify quick performance gains. Not for measurement methodology (→ See `mgrubb/agent-skills-golang@golang-benchmark` skill) or debugging workflow (→ See `mgrubb/agent-skills-golang@golang-troubleshooting` skill).
svelte-code-writer
bossoq/bossoq-skills
Svelte code writing and validation workflow. Use when creating, editing, reviewing, or debugging .svelte, .svelte.ts, or .svelte.js files.
sqlite-vec-skilld
skilld-dev/skilld
ALWAYS use when writing code importing \"sqlite-vec\". Consult for debugging, best practices, or modifying sqlite-vec, sqlite vec.
drupal-search
thomasroger76/drupal-skills
Use when implementing site search with Search API module, configuring search indexes (fields to index, processors), connecting to Solr backend (solr module, schema.xml, field mapping), connecting to Elasticsearch or OpenSearch backend, building search pages with Views + Search API, implementing faceted search with the Facets module, creating custom Search API processors for data transformation or query alteration, configuring multilingual search (langcode, language-specific analyzers), debugging Search API indexing issues (drush sapi-i, sapi-c), implementing search autocomplete, configuring full-text search relevance scoring, or building search pages without Views (SearchApiQuery API) in Drupal 8-11+
zoom-oauth
zoom/zoom-plugin
Reference skill for Zoom authentication. Use after routing to an auth workflow when choosing app credentials, grant types, scopes, token refresh behavior, or debugging Zoom OAuth failures.
mz-debug-ci
materializeinc/materialize
>
spark-optimization
convxai/claude-plugin-agents
Optimize Apache Spark jobs with partitioning, caching, shuffle optimization, and memory tuning. Use when improving Spark performance, debugging slow jobs, or scaling data processing pipelines.
spark_sql
ivanshamaev/de-agent-skills
Use when writing, reviewing, debugging, or optimizing production Spark SQL for Hive/lakehouse/HDFS tables, including CTE-heavy queries, joins, windows, partition pruning, Hive Metastore operations, insert/overwrite safety, query hints, statistics, EXPLAIN plans, AQE, skew, materialization, and SQL performance diagnostics.
kotlin-coroutines
rcosteira79/coroutine-skills
Use when writing, reviewing, or debugging coroutine code in Kotlin — including dispatcher selection, scope management, structured concurrency, cancellation, exception handling, or async patterns in Android or KMP projects.
bc-business-events-generator
fernandoartalf/al-copilot-skills-collection
Implements external business events for Business Central enabling Power Automate and external system integrations. Creates EventCategory enum extensions with custom categories, business events codeunit with ExternalBusinessEvent attribute procedures (eventName, displayName, description, category parameters), event subscriber procedures listening to IntegrationEvent publishers, and IntegrationEvent publishers in table extensions or codeunits for lifecycle triggers (OnAfterInsert, OnAfterModify, OnBeforePost). Follows event-driven architecture separating technical events from business semantics. Integrates with Business Event Subscriptions, Business Event Activity Log, Business Event Notifications for debugging and monitoring. Supports GUID-based entity tracking, meaningful parameter passing (SystemId, key fields, business relevant data), and proper transaction handling. Use when creating business events for Power Automate triggers, implementing external integrations, exposing BC events to Dataverse, building event-driven workflows, adding webhook capabilities, enabling low-code automation triggers, or connecting BC to Power Platform cloud flows with automated triggers.
threejs
devinilabs/pro-skill
Use when building or debugging interactive 3D scenes on the web with Three.js (scene/camera/renderer, lights/materials, GLTF loading, controls, performance). Helpful for designers shipping 3D UI moments.
bc-al-bug-fix
fernandoartalf/al-copilot-skills-collection
Diagnoses and fixes bugs in Business Central AL extensions following a structured investigation workflow. Covers the full fix cycle: symptom triage, root cause identification, minimal targeted fix, and regression test. Maps BC-specific symptoms to their most likely root causes before touching code — including FlowField miscalculation, SetLoadFields data truncation, event subscriber ordering, trigger execution gaps, permission errors, and posting validation failures. Generates a diagnosis document before any code change. Use this skill whenever you need to debug AL code, fix a BC extension bug, investigate unexpected behaviour, resolve a runtime error, troubleshoot a posting failure, investigate a wrong value on a page, or fix a broken event subscriber. Also use when the user says 'this is not working', 'wrong value', 'record not found', 'not triggered', 'permission error', or any AL/BC runtime complaint.
github-actions
bcgov/agent-skills
BC Gov hardening patterns for GitHub Actions workflows — deny-all `permissions: {}` baseline with per-job step-ups, first-party tag vs third-party SHA pinning, fork-gate, single results-aggregator required check, pinned ubuntu-24.04 runners, script-injection-safe env handling, and signed-commit ruleset interaction. Covers `.github/workflows/*.yml`, `dependabot.yml`, and the branch-protection / repository-ruleset settings that pair with them. Use when authoring or reviewing a workflow in a BC Gov repo, debugging permission-denied errors, or onboarding Dependabot.
bc-agent-instructions-debugger
fernandoartalf/al-copilot-skills-collection
Audits and diagnoses Business Central agent instruction files (InstructionsV1.txt or InstructionsV2.txt) to identify why an agent is not behaving as expected, and produces a structured diagnosis report plus a corrected version of the instructions. Covers pre-publication review (catch issues before deploying) and post-deployment debugging (diagnose a live agent that is failing). Analyzes instruction files against the BC agent runtime keyword contract, the Responsibilities-Guidelines-Instructions framework, and known anti-patterns. Generates severity-classified findings (🔴 blocking / 🟡 degradation / 🔵 improvement) with root cause explanation and minimal targeted fixes. Use whenever an agent produces unexpected output, loses context between pages, ignores a guideline, fails to invoke an action, gets stuck in a loop, or when you want to review instructions before publishing an agent for the first time.
adk-observability-guide
kumaran-is/claude-code-onboarding
ADK observability, Cloud Trace, prompt logging, agent analytics, BigQuery agent logs, ADK monitoring, ADK telemetry. Use when configuring tracing, logging, or analytics for ADK agents, debugging production agent behavior, or setting up monitoring for a deployed agent.
boxlang-runtime-architecture
ortus-boxlang/skills
Use this skill when understanding BoxLang internals: BoxRuntime services, IBoxContext hierarchy, scope chain resolution, DynamicObject, type system (IBoxType), parsing pipeline (source to bytecode), class loader isolation, virtual threads, or using --bx-printast for AST debugging.
dx-coding-playbook
logbookfordevs/ai-field-kit
Apply DX-first heuristics to implementations, refactors, reviews, and debugging. Use when the user asks for code review, refactoring guidance, API design feedback, maintainability/readability improvements, or “make this easier to debug/onboard”.
chrome-automation
anbeime/skill
Connect to and control Google Chrome browser using agent-browser with CDP (Chrome DevTools Protocol). Use when the user wants to automate their existing Chrome browser, see browser actions in real-time, or needs to control the Chrome instance they're already using. Handles installation, setup, connecting via remote debugging, and all browser automation tasks with live visual feedback.
z-qa-analyst
victorzhuk/skills
Codebase research and prioritized test-plan authoring — build a requirements-traceability matrix mapping source files to test files, tier risk into P0/P1/P2, and record honest coverage status from the project's own coverage tool. Auto-activates for: test planning, QA analysis, coverage mapping, test priority classification, acceptance traceability, writing or updating a test plan. Does not cover test stub generation; see [[z-qa-spec-writer]]. Does not cover running or triaging tests; see [[z-qa-debugger]].
libgdx-file-io-preferences
kyu-n/gdx-claude-skills
Use when writing libGDX Java/Kotlin code involving file I/O (FileHandle, Gdx.files, FileType) or persistent storage (Preferences). Use when debugging files not found, write failures on Android/iOS, wrong file paths across platforms, or preferences not persisting.