Most people pay for Opus 5.5 and use it like a search box.
20 open-source repos that turn Claude Code into a full dev setup, sorted by what they fix. Every repo here was checked before posting.
- SEE YOUR SPEND
01 ccusage (ccusage/ccusage) → token use and cost per day and per session, read from your local logs
02 ccstatusline (sirmalloc/ccstatusline) → a status line with the model and context usage under every prompt
03 RTK (rtk-ai/rtk) → shrinks the output of common dev commands before Claude reads it
04 LLMLingua (microsoft/LLMLingua) → compresses long prompts and keeps the facts that matter
- FEED IT LESS, BETTER
05 Claude Context (zilliztech/claude-context) → code search over MCP, so Claude pulls the relevant code instead of whole files
06 Serena (oraios/serena) → reads and edits code by symbol, the way an IDE does
07 Repomix (yamadashy/repomix) → packs a whole repo into one AI-friendly file
08 Gitingest (coderamp-labs/gitingest) → swap “hub” for “ingest” in any GitHub URL and get a prompt-ready digest
09 Context7 (upstash/context7) → current library docs inside the chat, fewer invented APIs
- MEMORY AND PLANNING
10 claude-mem (thedotmack/claude-mem) → carries compressed context from one session to the next
11 Context engineering (coleam00/context-engineering-intro) → templates for CLAUDE.md and feature specs
12 Task Master (eyaltoledano/claude-task-master) → turns a spec into tasks the agent works through one by one
13 Superpowers (obra/superpowers) → skills for planning, test-first work and code review
- SKILLS, AGENTS, PLUGINS
14 Skills (anthropics/skills) → Anthropic’s official Agent Skills
15 Official plugins (anthropics/claude-plugins-official) → Anthropic-managed plugin directory
16 100+ subagents (VoltAgent/awesome-claude-code-subagents) → specialists for reviews, tests, docs and more
17 Templates CLI (davila7/claude-code-templates) → installs agents, commands, hooks and MCP servers for you
- RUN, TEST, ROUTE
18 Claude Squad (smtg-ai/claude-squad) → several agents in parallel, each in its own worktree
19 Playwright MCP (microsoft/playwright-mcp) → Claude drives a real browser and checks what it built
20 Claude Code Router (musistudio/claude-code-router) → sends simple jobs to cheaper models
Where to start: install ccusage and look at a week of your own numbers. Then add one tool from “feed it less” and compare the next week.
Prompt: “make me a button”
Result: a $9/month SaaS with an onboarding tour, a pricing page and an AI assistant.
I asked Opus 5.5 to parody itself. It was a little too honest:
me: build me a small airport sim
claude: done. also added 8 security lanes that open on their own, baggage tugs, and a rebooking system
me: why are people missing their flights
claude: realism
I followed one passenger through the day before Thanksgiving.
#2228 got to the curb at 1:34 pm and spent 20 minutes in the security line. The doors on NF 299 to San Diego closed while they were standing at the jet bridge.
None of it is real.
Opus 5.5 built the whole terminal, and the simulation decides who makes their flight.
4.8 trillion damage. 0 lines of code from me.
Opus 5.5 built this Roblox-style simulator in one chat:
pets from Common to Rainbow, bosses with crowns, rebirths and four worlds. My run started at 62 damage.
About 900 lines in a single HTML file, and it runs in a browser tab.
No Roblox Studio involved.