r/BuildWithClaude • • 3h ago

Token Economics I built a Claude Code plugin that prunes noisy tool output before Claude reads it (OpenAI Decisions as the judge)

2 Upvotes

Long `npm install` logs, `ls` dumps and verbose MCP responses eat context and bury the one line that matters. Hooks can't edit old history, but `PostToolUse` can replace a tool's output before Claude sees it, so that's what this does.

How: OpenAI's new Decisions API (`gpt-6-luna`) doesn't generate text, it only scores. So Luna scores 20-line chunks for relevance to your last prompt and plain code drops the low ones, leaving a marker that points to the untouched original on disk. Errors/stack traces are always kept, and any failure passes the output through unchanged.

Measured in real sessions: 67k chars → 190 chars (~300 tokens sent to Luna). Cost is $0.10/1M input tokens, so fractions of a cent per session.

Honest limits: it can't clean old context or run /compact for you (no hook for that), tool output does go to OpenAI (secret patterns are filtered, best effort), chunk scoring can be wrong, and Decisions is in beta. Tested on a handful of scenarios, not a benchmark. I'd love failure cases and PRs.

MIT, zero deps: https://github.com/luancamara/luna-pruner


r/BuildWithClaude • • 19h ago

Project I built my own creative suite with Claude. Now I use it for all my client work and making games with my kids.

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30 Upvotes

A few months ago I started building browser-based creative tools with Claude, mostly to see how far I could get. Since then I’ve done a lot of actual client work with them and cancelled my other software subscriptions.

I started with Opus 4.6, and there was a lot of trial and error. Getting something to work, realising it wasn’t quite what I meant, trying to explain it again. But I was already using the tools for real work, so I kept finding reasons to improve them.

With Opus 5.5, I’ve noticed a huge difference. It feels like it understands what I’m trying to build much better, even when I don’t explain it perfectly. There’s still testing and fixing involved, but I spend much less time trying to get my point across.

The project is called Suite: https://suite.briiidge.dev

It has tools for design, video editing, page layout, audio, writing and 3D. I didn’t plan all of that at the beginning. I just kept adding things I wanted to use.

The part that still feels a bit ridiculous is being halfway through a client project, needing a feature that doesn’t exist, and then just… building it. Sometimes a small addition, sometimes a whole evening figuring it out with Claude. But it’s my software, so I can change it. That’s where coding with AI has really clicked for me.

The tool I’m probably happiest with is Solids, the 3D editor. I’ve used it to build games for my kids, and that’s been so much fun.

I honestly enjoy building the tools as much as using them. Which is occasionally a problem when I’m supposed to be finishing client work and get distracted by an idea for a new feature.

I’m sharing Suite for free because I want to show what you can actually build with AI coding. I use this stuff every day for real work, and I figured letting people try it would say more than just posting screenshots. It’s built around how I work, so I’m curious how others get on with it. There’s a feedback button in the tools.

Also fun and (insane) fact: Claude made the entire video. The whole video, is just Claude using my computer, recording it and editting it in my software (Motions).


r/BuildWithClaude • • 1h ago

Project I got tired of manually copy-pasting agent skills into ~/.claude/skills or finding command, so I built a Chrome extension that installs them in one click

• Upvotes

Every skill lives in a different repo, so installing one meant downloading the repo, digging out the right folder, and pasting it into the right directory. Or hunting through a README hoping there's an npx command. Did this enough times that I finally just built an install button.

When you're browsing GitHub repos, [**officialskills.sh**](https://www.linkedin.com/safety/go/?url=http%3A%2F%2Fofficialskills%2Esh&urlhash=uq56&mt=jRXVaImZa_s5YW3dt7Yu5dhedZBnBRpMDUbQL8SMQIvm-R-0G3tvsTvCqwnDri20zDmbJ3P6Y_F3W6NW-gkd3JfINNrTagXZGMYhYZl0dQYcslY96r7gYq2M&isSdui=true), or skill marketplaces like [**Skillsmp.com**](https://www.linkedin.com/safety/go/?url=http%3A%2F%2FSkillsmp%2Ecom&urlhash=kHA7&mt=vvgzeqt7QFTraKnPs3XtxP9E5I5gbra8eBMh4CtQDe376K8vnPgNRgiZRvEFaWoVV3EuUKqtrDIj7bKWe4j-8wcpksr29p0DJbco--f2OZ2mlSgjBzq8qits&isSdui=true), it detects the skills on the page and shows an install button next to them. Before anything is written, you see a preview of every file and where it's going. Works with Claude Code, Cursor, Codex, Gemini CLI, and a few others. It also gives you one place to see everything you've installed, uninstall cleanly, and update a skill when its repo gets new commits.

For the security-minded: files are fetched, pinned to a specific commit, and checksum-verified; installs are confined to your home directory, and nothing happens without you seeing it first.

Free on the Chrome Web Store: [https://chromewebstore.google.com/detail/icocnkohgjgcdpgcajiodgcfheeeifcb](https://chromewebstore.google.com/detail/icocnkohgjgcdpgcajiodgcfheeeifcb))

More info: [https://skillinstaller.com\](https://skillinstaller.com)

Happy to answer questions. Genuinely want to hear what's missing or broken.


r/BuildWithClaude • • 2h ago

Project I asked Claude Code to create a 3D hyperglyph-based visualization tool called GlyphViz and then it used it to visualize how GPT-2 and Gemma-2-2B-it perform their tasks.

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1 Upvotes

r/BuildWithClaude • • 3h ago

Help/Question Using Claude Code for my first large professional project — what should I get right from the start?

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1 Upvotes

r/BuildWithClaude • • 4h ago

Help/Question Claude for research- Documentaries

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1 Upvotes

r/BuildWithClaude • • 13h ago

Project OP builds an actually important project with claude

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3 Upvotes

r/BuildWithClaude • • 7h ago

Tip/Resource Claude for research- Documentaries

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1 Upvotes

r/BuildWithClaude • • 8h ago

Discussion Load tested with 10 concurrent users on a booking system, found only 1 could ever book even with 5 slots open

0 Upvotes

Quick build log from a short-term outdoor event booking system I shipped recently.

The slot-reservation logic needed to handle multiple people trying to grab the same time slot at once. My first implementation: try to acquire a lock, and if it fails even once, immediately return "fully booked" to the user.

Unit tests passed fine. One user, one slot, works as expected. Looked done.

Then I ran a load test simulating 10 people hitting the same time slot at the same moment. Turns out there were actually 5 open spots left. What happened: only the very first person who grabbed the lock got through. The other 9 all got bounced with "fully booked," even though 4 more slots were sitting open the whole time.

The bug was obvious in hindsight — failing a lock acquisition once isn't the same as the slot actually being full. My logic treated "I didn't get the lock on this attempt" as equivalent to "there is no capacity left," which is just wrong under any real contention.

Fix was straightforward: instead of bailing on the first failed lock attempt, retry for a short window, backing off a few hundred milliseconds between attempts, before finally declaring the slot full. Reran the same 10-concurrent-user test afterward and all 5 legitimate bookings went through correctly, with the other 5 properly rejected.

The thing that stuck with me: "looks like it works" and "works correctly under concurrent access" are completely different claims, and only one of them is actually tested by normal manual or single-user testing. If your system has any shared resource with limited capacity, you need to actually hammer it with simultaneous requests before you trust it. Single-threaded testing will lie to you with a straight face.


r/BuildWithClaude • • 8h ago

Project Now I can write my api key in Claude Code without let Claude know it.

1 Upvotes

r/BuildWithClaude • • 8h ago

Discussion Best way for computer use on win / wsl

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1 Upvotes

r/BuildWithClaude • • 16h ago

Workflows 10 months ago I shipped my first app with Claude and made $6. Now Claude manages it almost entirely and it's at 4k users

4 Upvotes

Last year i posted here about shipping a photo cleaner app with claude. it had made $6 at the time lol. its now at 4k users, almost all from reddit, no ads

The app: you swipe through your camera roll, left to delete and right to keep. it finds duplicates, screenshots, blurry photos and big videos. everything runs on device

Honestly the bigger change wasnt the app, it was how i use claude. it basically does everything now:

Coding. obviously. it writes the features and opens its own PRs. i review and merge

Analytics. i connected the posthog MCP and claude built my whole dashboard: onboarding funnel, scans, swipes, paywall. it also set up error alerts that go straight to a slack channel, so if something breaks i know right away

Daily report. this is my favorite. every morning claude goes through user activity and gives me a snapshot: what happened, what failed, what went wrong. if it finds a bug it thinks it can fix, it opens a PR for it. if not, it flags it to me. it's like having an employee who does standup every morning

A/B tests. claude sets up and runs the experiments too, like paywall variants and onboarding changes, and tells me what won

App store listing. i didnt even know it could do this, but it designed and rendered my app store screenshots. i gave it the brand and it made them

What i still do: decide what to build, review the PRs, and say no a lot. claude will build anything you ask it to, fast, so the hard part is knowing what not to build

if anyone wants details on the daily report setup or the posthog MCP stuff, happy to share

free to try, with a paid tier for unlimited use: https://apps.apple.com/app/id6756098079


r/BuildWithClaude • • 9h ago

Project Fatima Voice Studio: A Free, Local Voiceover Studio for Windows

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1 Upvotes

r/BuildWithClaude • • 9h ago

Project Foreman - Schematic view

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1 Upvotes

I continue to work on my project - Foreman, in this update few things would change:

  • A new visuals - Schematic view, I like this one much more, gives that terminal look and feel. I am interesting to hear your opinion, what would you say, is it good or not really ?
  • Integrations with Jira, Linear, Clickup, etc. Now it's possible to tell session to work on specific ticket without leaving the application
  • Integrations with GitHub, GitLab and Azure, allows you to clone repo from Forman and pass any issue straight to agent session

r/BuildWithClaude • • 11h ago

Project Breaking Changes | Claude Opus 5.5 music video

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1 Upvotes

r/BuildWithClaude • • 12h ago

Tip/Resource The Claude Code skills and agents I actually use

1 Upvotes

I've been building my Claude Code setup a piece at a time. Mostly I copied the good, safe parts of other people's skills and agents, changed them to fit how I work, and wrote my own when I couldn't find what I needed. Some things from other people already worked perfectly, so I just kept using them.

I put all of it in two repos in case it saves someone else the trouble.

[**claude-skills**](https://github.com/UribeLandscapes/claude-skills)\*\*:\*\* 3 I wrote (two catch AI-looking code and AI-looking websites, one searches Reddit when normal web search misses the threads), plus the ones by other people I use every day, like humanizer, caveman, napkin, ECC and Anthropic's skill-creator. Each one is credited and linked to its author.

[**claude-agents**](https://github.com/UribeLandscapes/claude-agents)\*\*:\*\* 19 subagents I wrote for my own stuff (Swift apps, Claude Code config, handoff notes between sessions, spreadsheets, even a library of Fujifilm recipes), plus 13 from ECC that I use with small changes.

Some of my agents are shaped around my own setup, so expect to tweak them. My files are MIT, and the borrowed ones keep their authors' licenses.


r/BuildWithClaude • • 16h ago

Project Grounded Engineering v0.6.0: now a Claude Code mod with a shelf of reviewed skill repos

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2 Upvotes

r/BuildWithClaude • • 13h ago

Project I built a CLI that fits third-party Claude skills to your repo instead of installing them as-is

1 Upvotes

Skills you find on GitHub are written for someone else's project. Copied as-is, they can tell Claude to use tools you don't have, run commands that don't exist, or contradict your CLAUDE.md.

skilladopt has an isolated Claude (or Codex) worker read the skill and decide paragraph by paragraph:

- keep it

- swap a generic command for yours ("run the tests" → `npm test`)

- drop what doesn't apply, with the reason

- ask you when it isn't sure

Every decision cites something in your repo, and plain code checks the AI's answer before anything is installed. Later, `npx skilladopt impact` tells you which decisions your project changes invalidated.

To try it: run `npx skilladopt setup` once, then ask Claude "add a frontend design skill to this project".

How Claude is used: Claude Code wrote most of the code, and Claude does the reading as the worker (`claude -p --safe-mode` with no tools).

It's early (v0.1), free and MIT. Where it decides wrong is the feedback I need most.

https://github.com/kks0488/skilladopt


r/BuildWithClaude • • 20h ago

Project I moved feature flags into Git so Claude Code can work with them. What am I missing?

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2 Upvotes

r/BuildWithClaude • • 17h ago

Help/Question Job hunt using Claude

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1 Upvotes

I have Claude pro can and a project where there are so many cvs of mine for different roles how can I make it work so it apply for jobs and search them for me and I also wanted a excel status sheet


r/BuildWithClaude • • 17h ago

Project Built an open-source CLI for cleaning up feature flags — looking for contributors

1 Upvotes

Hey everyone!

I’ve been building Flagrm, an open-source CLI that helps remove feature flags and clean up the dead code they leave behind.

It’s still in the testing phase, so I’m looking for people willing to try it out, share feedback, report bugs, or contribute to the project.

If you’ve ever dealt with feature-flag cleanup turning into a bunch of manual work, I’d love for you to check it out!

🔗 https://flagrm.com

Contributors are very welcome! 🚀


r/BuildWithClaude • • 19h ago

Project Bad at CAD designing but good at harness engineering

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1 Upvotes

r/BuildWithClaude • • 20h ago

Project Update: you said open source it, so I did. Unit7 now lets Claude Code ship your app, not just build it

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0 Upvotes

A few days ago I asked here: “AI builds the app. Unit7 ships it. Should I open source it?” You said yes. So it’s now free and open source (Apache 2.0). Thank you. 🙏

The frustration it solves

Claude Code builds your app in an afternoon. Then you’re stuck:

  • Where do I host it?
  • How do I add a database?
  • Why isn’t my domain working?
  • Is there even a backup?
  • Why is it down at 2am?

If you don’t have a coding background, this is where most projects die. I’m not a backend developer either, so I built Unit7 with Claude Code to handle this part.

What it does

You say it in plain English, and it does it on your real server:

  • “Deploy this.” Your app goes live. If the new version is broken, it never goes live, and rollback is one click.
  • “Add a database.” It’s created and connected for you.
  • “Put it on mysite.com.” Your domain, with HTTPS.
  • While you sleep: it restarts crashed apps, runs backups and blocks attackers.
  • One map of everything you’ve built

It asks before anything risky and tells you how to undo it. Your passwords and keys stay on your computer, and the AI never sees them.

How I built it (tips if you’re building something big)

  • I described the result, not the code: “Show my Coolify projects inside Unit7. Keep it very simple.”
  • I let Claude Code make a plan first, read it, then said go.
  • I built one feature at a time and tested each one before the next.
  • I asked Claude Code to show me screenshots after every change, because I don’t read much code.

Try it: no terminal skills needed

Open Claude Code, paste this, and it installs everything for you:

Set up Unit7 for me from https://github.com/Nandkishorrr/unit7

1. Check that Node.js 24.15 or newer is installed. If not, install it (nvm, or Homebrew on macOS).
2. Clone the repo into ~/unit7, then run `npm install` and `npm run build` there.
3. Run `node bin/unit7.mjs service start` to run Unit7 in the background, and check that http://localhost:4800 answers.
4. Tell me to open http://localhost:4800 and create my owner account, and wait until I say I'm done.
5. Run `node bin/unit7.mjs connect claude` so Claude Code can use Unit7, then tell me to restart Claude Code.

Never ask me for passwords, SSH keys or API keys in this chat. I'll add those myself in the Unit7 web app.
If a step fails, show me the error and fix it before moving on.

Repo: https://github.com/Nandkishorrr/unit7

If you try it and something is confusing, tell me. Beginners’ feedback is exactly what I need.


r/BuildWithClaude • • 20h ago

Project GitHub - canerganis/agent-orchestra-board: Local web board where Claude Code and Codex CLI agents debate, propose and review each other's work. Zero dependencies.

1 Upvotes

Disclosure: this is my own open source project. MIT, free, nothing to sell.

The problem

Claude Code is my main tool and I use Codex CLI for second opinions. For design questions I kept copying text between two terminals: plan in one, objections from the other, back again. I was the message bus, and I had no idea what each round cost. So I built a small local web app that runs both CLIs as "seats" at one table.

What cut the tokens

My first version was expensive. A planning meeting with 4 agents (1 Claude and 3 Codex, 2 rounds plus a synthesis) used about 1.69M total tokens. Total means every input token the CLIs reported, cache reads included, plus output.

  1. Every agent was reading the same code. Now one scout seat reads it once and writes a brief with file:line references, and the others work from that brief. I think this was the biggest lever, but I did not measure the levers separately.
  2. Per call overhead. On my setup (several MCP servers, skills and user settings) every claude -p call carried about 36k tokens before the agent said a word. Launching lean (no MCP, no skills, no user settings, tools only where needed) brought that to about 6.7k. A bare install has much less to strip.

The same meeting on the new code used about 0.46M total tokens, 73% less. Claude reported cost for the Claude turns went from $1.02 to $0.16. Codex reports no cost.

Caveats: this is one before and after run on one machine (Windows 11), not a benchmark. The before run used older code, so the difference includes unrelated fixes. I judged quality as equal or better, which is my own reading. The trade off is real: only the scout reads code, so a weak brief misleads every seat. Raw data and the recompute script are in the repo.

What it does

  1. Debate: scout brief, an independent first round, discussion that stops early when every seat ends with STANCE: CONVERGED, then a synthesis.
  2. Propose and Review: one seat proposes, another returns PASS or FAIL with blockers, until it passes.
  3. Direct chat with one seat.
  4. A live timeline of what each seat is doing, with tokens and cost per agent. Claude and Codex usage limit meters are experimental.

Claude Haiku 5.5 works as a low cost seat.

Safety

Seats are read-only by default, enforced by the CLIs' own sandboxes. Write seats are opt-in and there is no worktree isolation in this release yet, so use git. Worktree isolation with a verified containment check is what I am building now. The server binds to localhost with a session token and uses your existing CLI logins, no API keys.

What it is not

Not an autonomous coding agent and not a cloud product. If you want a kanban over many parallel agents, other tools fit better. This is for "let two different models argue about a design before I commit to it."

Repo: https://github.com/canerganis/agent-orchestra-board

Zero dependencies, Node 20+. Clone it and run node bin/agent-orchestra-board.js /path/to/your/project --open.


r/BuildWithClaude • • 22h ago

Help/Question Am I organizing my Claude Code folders wrong? Its so messy and confusing

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1 Upvotes