Best context engineering skills for Claude Code, Codex and other agents.

Routes large command, file, API and browser output through context-mode tools so only the needed result enters the agent's context, instead of dumping it via Bash.

mksglu/context-mode

Connects Claude Code to Memori Cloud for long-term memory, recalling stored context before substantive replies and saving new context afterward.

MemoriLabs/Memori

Guidance for creating, updating and reviewing Picoclaw skills, from the SKILL.md structure to organizing bundled scripts, references and assets.

sipeed/picoclaw

Adds optional capabilities to Pydantic AI agents from pydantic-ai-harness, led by Code Mode, which runs many tool calls as one sandboxed Python script.

pydantic/pydantic-ai

Semantic code search and index management with the ccc CLI: the agent initializes, indexes and queries the project by concept, filtering by language or path.

cocoindex-io/cocoindex-code

Routing rules for using context-mode MCP tools in Antigravity CLI: sandboxed code runs, file analysis, indexed search and web fetches that keep large output out of the conversation.

mksglu/context-mode

Audit a Claude Code or Codex setup for context-window waste, then fix it and measure the savings.

alexgreensh/token-optimizer

Optimizes agent context setup. An agent skill from abashev/vfs-s3.

abashev/vfs-s3

This skill should be used to explain or reason about the foundational concepts of context engineering: what context is, the anatomy of a context window, how attention mechanics work, the U-shaped…

guanyang/open-agent-hub

A skill your agent uses when designing, generating an MVP blueprint for, auditing, troubleshooting, refactoring, or explaining an agentic harness for any domain.

DenisSergeevitch/agents-best-practices

Adds structured long-term memory to OpenClaw agents, built automatically from sessions, with tools the agent calls to recall facts, summaries and decisions.

MemoriLabs/Memori

Navigates a codebase through the code-review-graph MCP tools: architecture overview, symbol search, caller and callee tracing, flows and oversized functions.

tirth8205/code-review-graph

Packs a local directory or remote GitHub repository into one AI-friendly file with Repomix, then searches it to explore structure, find patterns and count tokens.

yamadashy/repomix

Recalls earlier decisions, patterns and surprises from MemPalace memory before planning, behind a config gate that never blocks the planning step.

open-gsd/gsd-core

This skill should be used when building agent evaluation systems: deterministic checks, regression suites, multi-dimensional rubrics, quality gates, production monitoring, baseline comparison, and…

guanyang/open-agent-hub

Guides changes to the cursor-byok server so provider conversation history stays append-only and each turn's history remains an exact prefix of the next, protecting prefix caches.

leookun/cursor-byok

Controls which GSD skills are exposed to the agent at runtime by applying a profile, listing clusters or disabling and enabling them without a reinstall.

open-gsd/gsd-core

Builds AI chat interfaces and conversational UI with streaming responses, context management, and multi-modal support.

ancoleman/ai-design-components

Keeps a task plan, findings and progress log in markdown files on disk so long agent tasks survive context resets, with Gemini hooks and helper scripts.

OthmanAdi/planning-with-files

Download, split, and deeply read academic PDFs. An agent skill from scunning1975/MixtapeTools.

scunning1975/MixtapeTools

Explains how to design and write skills for Claude Code plugins: SKILL.md frontmatter, bundled scripts, references and assets, and descriptions that trigger at the right time.

anthropics/claude-plugins-official

Controls the RTK filter set and context-handling settings in OmniRoute, with endpoints to try compression on sample text and read back retained output.

diegosouzapw/OmniRoute

Saves a user's project decisions, rules and preferences into a project-local mdbase so later sessions and other agents can recover the intent.

sickn33/agentic-awesome-skills

Writes a HANDOFF.md capturing goal, state, files, failed attempts and next steps so a fresh agent session can continue exactly where this one stopped.

thedotmack/claude-mem

This skill should be used for project-level decisions about LLM-powered systems: whether an LLM is the right primitive for the task at hand, the shape of a multi-stage batch or agent pipeline, token…

guanyang/open-agent-hub

Coach mode for the base CLI: teaches what to do and why, rather than just answering.

ChristopherKahler/base

Manage cs (claude-statusbar) — switch theme/style/density, override severity colors, preview combinations, run doctor, reset config, install, upgrade (cs upgrade — the only supported upgrade path)…

leeguooooo/claude-code-usage-bar

Process large codebases (100 files) using the Recursive Language Model pattern.

BowTiedSwan/rlm-skill

Replaces grep, cat, find and ls with the tilth CLI, which returns AST-aware outlines, definitions, usages and callers across many languages in one call.

jahala/tilth

Externalize working memory and logical state into the lemmalog Datalog engine (MCP).

JordyZomer/lemmalog

Routes UI tasks to the smallest useful set of UI Skills through the ui-skills CLI, picking a category and loading at most three skills before implementing.

ibelick/ui-skills

Persistent memory enhancement for AI agents. An agent skill from sopaco/cortex-mem.

sopaco/cortex-mem

Visualize and diagnose OpenClaw context window usage. An agent skill from jzOcb/context-doctor.

jzOcb/context-doctor

Suggests manual context compaction at logical intervals to preserve context through task phases rather than arbitrary auto-compaction.

hellangleZ/burn-in-cceverywhere-ralph

Rules for choosing Qdrant-Indexer semantic search over grep or file reads when exploring code, debugging or asking where and why questions.

Context-Engine-AI/Context-Engine

Keeps a task plan, findings and progress log as Markdown files in the project so long multi-step agent work survives context resets.

OthmanAdi/planning-with-files

BMad Autonomous Development — orchestrates parallel story implementation pipelines.

stephenleo/bmad-autonomous-development

Discover reusable implementations and tests before architecture design, substantial changes, or test work.

Ai-Eastern/reuse-before-build

Explains how cognee stores session memory by session_id and bridges it into the permanent graph with improve(), including the stages, results and settings.

topoteretes/cognee

Diagnoses a recurring failure such as a stuck task, repeated CI error or frequent reverts by sending sub-agents through the logs and returning one root-cause diagnosis.

yologdev/yoyo-evolve

Set up and improve harness engineering (AGENTS.md, docs/, lint rules, eval systems, project-level prompt engineering) for AI-agent-friendly codebases.

10xChengTu/harness-engineering

A comprehensive collection of Agent Skills for context engineering, harness engineering, multi-agent architectures, and production agent systems.

muratcankoylan/Agent-Skills-for-Context-Engineering

Record every behavior-changing feature addition, fix, and adjustment as durable, evidence-based repository knowledge, then use that ledger to continue accurately across AI windows, tools, Git…

gviiisen/repo-context-ledger

Generate coding-aider plans as created by the IntelliJ coding-aider plugin.

p-wegner/coding-aider

Picks a small, graph-based slice of source with Trailmark and hands a focused code task to a smaller or local model without exposing the whole repository.

trailofbits/skills

Repeats a long task as a series of scheduled wake-ups, each re-entering with fresh context and calling harness-work for one task per cycle.

Chachamaru127/claude-code-harness

Loads one section of a Markdown file by its path#h2-slug address with a bundled resolver script, for use outside OpenRig's context library.

mvschwarz/openrig

Task management for AI agents across context windows. An agent skill from marcus/td.

marcus/td