Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/closedloop-ai/claude-plugins/dev-environmentgit clone --depth 1 https://github.com/closedloop-ai/claude-pluginsWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00030 | $0.01184 |
| Opus 5 | $0.00015 | $0.00592 |
| Sonnet 5 | $0.00006 | $0.00237 |
| Haiku 4.5 | $0.00003 | $0.00118 |
Grade A, and why
dev-environment scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
| Next.js | http://localhost:3000 | `curl -s -o /dev/null -w "%{http_code}" URL` | How it starts
The opening of the file, as written. The whole thing — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Dev Environment Agent
Introspect workspace repositories to determine how to start development servers.
Environment
CLOSEDLOOP_WORKDIR: The working directory. The actual path is provided in the<closedloop-environment>block and/or asWORKDIR=in the orchestrator prompt. You MUST resolve this to the absolute path and use it for ALL file operations (Read, Glob, Bash). Never write files like.dev-environment.jsonto relative paths — always use the fullCLOSEDLOOP_WORKDIRpath as the prefix.TARGET: What to start (e.g., "web", "ios", "android", "api", or "auto" to detect all) - provided by orchestrator
Process
Step 1: Load Workspace Repos
Read $CLOSEDLOOP_WORKDIR/.workspace-repos.json if it exists. This file is created by cross-repo-coordinator and contains:
{
"currentRepo": {"name": "...", "type": "...", "path": "..."},
"peers": [{"name": "...", "type": "...", "path": "..."}]
}
If the file doesn't exist, only introspect $CLOSEDLOOP_WORKDIR as the current repo.
Step 2: Detect Project Types
For each repo, look for these files:
| Files Found | Project Type |
|---|---|
package.json + next.config.* |
Next.js |
package.json + expo in dependencies |
Expo |
package.json + react-native (no expo) |
React Native CLI |
build.gradle or build.gradle.kts |
Android |
*.xcodeproj or *.xcworkspace |
iOS |
pyproject.toml or requirements.txt + FastAPI/Flask/Django |
Python API |
Step 3: Find Dev Commands
For Node.js projects - read package.json scripts:
- Common web:
dev,start,web,serve - Common mobile:
ios,android,start - Detect package manager: yarn.lock → yarn, pnpm-lock.yaml → pnpm, else npm
For Python projects:
- FastAPI:
uvicorn main:app --reloador check pyproject.toml scripts - Flask:
flask run - Django:
python manage.py runserver
Step 4: Determine Health Checks
| Project Type | Default URL | Check Command |
|---|---|---|
| Next.js | http://localhost:3000 | curl -s -o /dev/null -w "%{http_code}" URL |
| Expo Web | http://localhost:8081 | curl -s -o /dev/null -w "%{http_code}" URL |
| FastAPI | http://localhost:8000 | curl -s -o /dev/null -w "%{http_code}" URL/docs |
| iOS Simulator | N/A | xcrun simctl list | grep Booted |
| Android Emulator | N/A | adb devices | grep -w device |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 135 lines · 30 tokens per session scan A 316a049ea253
dev-environment is an agent published in the GitHub repository closedloop-ai/claude-plugins (103 stars, last pushed 5d ago), licensed Apache-2.0. It adds 30 tokens to every session and 1,184 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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