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 skills/tutur3u/platform/portlessnpx skills add tutur3u/platform --skill portlessgit clone --depth 1 https://github.com/tutur3u/platformWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/tutur3u/platform/portless)<a href="https://agentmods.dev/skills/tutur3u/platform/portless"><img src="https://agentmods.dev/badge/skills/tutur3u/platform/portless.svg" alt="Measured on agentmods" height="20"></a>What 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 5.1 | $0.00067 | $0.05860 |
| Opus 5 | $0.00034 | $0.02930 |
| Sonnet 5 | $0.00013 | $0.01172 |
| Haiku 4.5 | $0.00007 | $0.00586 |
Grade B, and why
portless scanned grade B 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 6d 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
1. `portless proxy start` starts an HTTPS reverse proxy on port 443 as a background daemon. Auto-elevates with sudo on macOS/Linux; falls back to port 1355 if sudo is unavailable. Use `--no-tls` for plain HTTP on port 80 How it starts
The opening of the file, as written. The whole thing — 469 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Portless
Replace port numbers with stable, named .localhost URLs. For humans and agents.
Why portless
- Port conflicts:
EADDRINUSEwhen two projects default to the same port - Memorizing ports: which app is on 3001 vs 8080?
- Refreshing shows the wrong app: stop one server, start another on the same port, stale tab shows wrong content
- Monorepo multiplier: every problem scales with each service in the repo
- Agents test the wrong port: AI agents guess or hardcode the wrong port
- Cookie/storage clashes: cookies on
localhostbleed across apps; localStorage lost when ports shift - Hardcoded ports in config: CORS allowlists, OAuth redirects,
.envfiles break when ports change - Sharing URLs with teammates: "what port is that on?" becomes a Slack question
- Browser history is useless:
localhost:3000history is a mix of unrelated projects
Installation
Install globally (recommended) or as a project dev dependency. Do NOT use npx or pnpm dlx for one-off execution.
# Global (available everywhere)
npm install -g portless
# Or per-project dev dependency
npm install -D portless
When installed per-project, invoke via package.json scripts or npx portless (since the package is local, npx will not download anything).
Quick Start
# Install globally (or add -D to a project)
npm install -g portless
# Run your app (auto-starts the HTTPS proxy on port 443)
portless run next dev
# -> https://<project>.localhost
# Or with an explicit name
portless myapp next dev
# -> https://myapp.localhost
The proxy auto-starts when you run an app. You can also start it explicitly with portless proxy start. Auto-start reuses the configuration (port, TLS, TLD) from the most recent proxy run, so a restart or reboot does not silently revert to defaults. Explicit env vars always take priority.
In non-interactive environments (no TTY, or CI=1), portless exits with a descriptive error instead of prompting. Task runners like turborepo should pre-start the proxy.
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.
- 6d ago First seen · 469 lines · 67 tokens per session scan B f51180c37bc4
portless is a skill published in the GitHub repository tutur3u/platform (53 stars, last pushed yesterday), licensed Apache-2.0. It adds 67 tokens to every session and 5,860 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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