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Agent skill

Finding Dev Server URL

by spencerpauly in spencerpauly/awesome-cursor-skills

Scan running terminals for dev server URLs (localhost ports), report them, and optionally open the app in Cursor's built-in browser.

CC0-1.0Auto-check passedBackend & APIs

Install Finding Dev Server URL

skills CLI
$ npx skills add spencerpauly/awesome-cursor-skills --skill finding-dev-server-url -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install spencerpauly/awesome-cursor-skills finding-dev-server-url --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/spencerpauly/awesome-cursor-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/resources/finding-dev-server-url .claude/skills/finding-dev-server-url && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
finding-dev-server-url
GitHub stars
841
Token cost
~740 tokens
SKILL.md length
307 words
Files
1
Skills in repo
59
Repo updated
First seen
Licence
CC0-1.0

At a glance

Scan running terminals for dev server URLs (localhost ports), report them, and optionally open the app in Cursor's built-in browser.

  • Works in 5 steps: List All Terminals → Read Each Terminal's Metadata → Scan for Server URLs → …
  • Backend & APIs work in your project
  • SKILL.md covers How It Works, Workflow and Tips
  • Calls npm, pnpm and python

What it does

Finding Dev Server URL is an agent skill from spencerpauly/awesome-cursor-skills. Scan running terminals for dev server URLs (localhost ports), report them, and optionally open the app in Cursor's built-in browser.

Its SKILL.md is about 740 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Backend & APIs. The repository describes itself as: A curated list of awesome skills for Cursor. The licence is CC0-1.0.

When your agent uses it

  • Backend & APIs work in your project

Example prompts

  • “/finding-dev-server-url”

Requirements

  • Python 3

Workflow steps

5 steps, taken from the step headings in SKILL.md.

  1. List All Terminals
  2. Read Each Terminal's Metadata
  3. Scan for Server URLs
  4. Report
  5. Open in Browser (Optional)

What it can do on your machine

Read from SKILL.md and the folder at commit 99cd265. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • npm
    • pnpm
    • python
    • git

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use npm, pnpm and git, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Finding Dev Server URL loads about 740 tokens when it runs. Until then it costs about 39 tokens; SKILL.md has 307 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~39
When it runs · the whole SKILL.md, loaded when a task matches
~740

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from spencerpauly/awesome-cursor-skills at commit 99cd265, republished under its CC0-1.0 licence (© spencerpauly). 307 words, ~740 tokens.

Download SKILL.mdSave it as .claude/skills/finding-dev-server-url/SKILL.md (or your agent's skills folder).
name
finding-dev-server-url
description
Scan running terminals for dev server URLs (localhost ports), report them, and optionally open the app in Cursor's built-in browser.
user-invocable
true

Finding Dev Server URL

Detect which dev servers are running, what ports they're on, and open them.

How It Works

Cursor stores live terminal output in text files. Each terminal has a file at:

<terminals_folder>/<id>.txt

The terminals folder path is provided in your system context. Each file contains metadata (pid, cwd, last command) followed by the full terminal output.

Workflow

1. List All Terminals
bash
ls <terminals_folder>/*.txt
2. Read Each Terminal's Metadata

Read the first ~10 lines of each terminal file to see:

  • pid — process ID
  • cwd — working directory
  • last_command — what's running (e.g. npm run dev, pnpm dev, python manage.py runserver)

Skip terminals where the last command is clearly not a server (e.g. git status, ls, cd).

3. Scan for Server URLs

Read the full content of terminals that look like they're running a server. Search for these patterns:

FrameworkPattern
Next.jsLocal: http://localhost:XXXX or ▲ Ready
ViteLocal: http://localhost:XXXX/
Create React AppLocal: http://localhost:XXXX
Expresslistening on port XXXX or listening at http://...
DjangoStarting development server at http://127.0.0.1:XXXX/
RailsListening on http://127.0.0.1:XXXX
FlaskRunning on http://127.0.0.1:XXXX
GoListening on :XXXX or http server started on :XXXX
PHPDevelopment Server (http://localhost:XXXX) started
Remixhttp://localhost:XXXX
Astrohttp://localhost:XXXX
Nuxthttp://localhost:XXXX

Regex to match most server output:

https?://(localhost|127\.0\.0\.1|0\.0\.0\.0)(:\d+)

Also check for standalone port patterns:

(listening|started|running|ready|serving).*(port\s*|:)\s*(\d{4,5})
4. Report

Print a summary:

Dev servers found:
  Terminal 1 (pid 12345) — npm run dev → http://localhost:3000 (cwd: /Users/me/app)
  Terminal 3 (pid 67890) — python manage.py runserver → http://127.0.0.1:8000 (cwd: /Users/me/api)

If no servers are found, say so and suggest starting one.

5. Open in Browser (Optional)

If the user wants to view the app, use Cursor's built-in browser:

browser_navigate → http://localhost:<port>

Then take a screenshot to confirm it's rendering:

browser_take_screenshot

Tips

  • If multiple servers are found, ask the user which one to open
  • If a terminal shows an error (e.g. EADDRINUSE, address already in use), report the conflict
  • If the server crashed (process exited), note that too — check for exit_code in the terminal file footer
  • Common default ports: Next.js (3000), Vite (5173), Django (8000), Rails (3000), Flask (5000), Go (8080)

© spencerpauly, CC0-1.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in resources/finding-dev-server-url of spencerpauly/awesome-cursor-skills.

Open the folder on GitHubat commit 99cd265

Compare with similar skills

Finding Dev Server URL next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Finding Dev Server URL compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Finding Dev Server URL this skillspencerpauly/awesome-cursor-skills841—~740Automated safety check: PassCC0-1.0
Configuring Horizoncoollabsio/coolify63k4 repos~898Automated safety check: PassMIT
Nestjs Best Practicesrolling-scopes/rsschool-app10k6 repos~1.2kAutomated safety check: PassMIT
Sub2API AdminWei-Shaw/sub2api43k1 repos~717Automated safety check: PassLGPL-3.0
Firecrawl Build Onboardingfirecrawl/firecrawl189k1 repos~1.4kAutomated safety check: NotesISC
Obsidian BasesAtmosphere/atmosphere3.8k22 repos~3.2kAutomated safety check: PassApache-2.0

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Categories

Questions about Finding Dev Server URL

What does Finding Dev Server URL do?

Scan running terminals for dev server URLs (localhost ports), report them, and optionally open the app in Cursor's built-in browser. Finding Dev Server URL is an agent skill from spencerpauly/awesome-cursor-skills. Scan running terminals for dev server URLs (localhost ports), report them, and optionally open the app in Cursor's built-in browser.

When should I use Finding Dev Server URL?

Finding Dev Server URL fits situations like: backend & APIs work in your project.

How do I install Finding Dev Server URL in Claude Code?

Run `npx skills add spencerpauly/awesome-cursor-skills --skill finding-dev-server-url -a claude-code`. Or copy the skill folder (resources/finding-dev-server-url in spencerpauly/awesome-cursor-skills) into .claude/skills/finding-dev-server-url in your project. Claude Code loads it when a task matches its description.

How do I install Finding Dev Server URL in Codex?

Run `npx skills add spencerpauly/awesome-cursor-skills --skill finding-dev-server-url -a codex`. Or copy the skill folder (resources/finding-dev-server-url in spencerpauly/awesome-cursor-skills) into .agents/skills/finding-dev-server-url in your project. Codex loads it when a task matches its description.

Can I use Finding Dev Server URL in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add spencerpauly/awesome-cursor-skills --skill finding-dev-server-url -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/finding-dev-server-url, .gemini/skills/finding-dev-server-url, .github/skills/finding-dev-server-url and .opencode/skills/finding-dev-server-url in your project.

What does Finding Dev Server URL need to run?

Going by SKILL.md and its folder, Finding Dev Server URL needs the command-line tools its instructions call (npm, pnpm, python and git). Our summary lists: Python 3.

Does Finding Dev Server URL access the network?

SKILL.md contains no URLs. Its commands use npm and git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Finding Dev Server URL safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Finding Dev Server URL use?

Finding Dev Server URL is published under the CC0-1.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Finding Dev Server URL use?

About 740 tokens (SKILL.md is roughly 3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Finding Dev Server URL?

Skills that share tags, products or a category with Finding Dev Server URL: Configuring Horizon (coollabsio/coolify, 63k stars), Nestjs Best Practices (rolling-scopes/rsschool-app, 10k stars), Sub2API Admin (Wei-Shaw/sub2api, 43k stars) and Firecrawl Build Onboarding (firecrawl/firecrawl, 189k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Finding Dev Server URL?

spencerpauly (a GitHub user) maintains it in spencerpauly/awesome-cursor-skills, which has 841 GitHub stars. The repository holds 59 skills in this directory. The repository was last updated on August 2, 2026.

Source: spencerpauly/awesome-cursor-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.