What is firebase-basics?

A foundation guide for the Firebase command-line tool, which lets developers manage Firebase projects from a terminal. Firebase is Google's platform for app services such as data, hosting, and authentication.

Use it to install or verify Firebase tools, sign in, create or select projects, download Android and iOS app configuration files, and set up related agent environments.

It standardizes installation checks, login, project selection, and downloading the configuration files needed by Android and iOS apps.

firebase-basics — Skill for Claude Code and Codex by firebase: A foundation guide for the Firebase command-line tool, which…

Install

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.

agentmods

npx agentmods add skills/firebase/agent-skills/firebase-basics

Any agent

npx skills add firebase/agent-skills --skill firebase-basics

Clone the repo

git clone --depth 1 https://github.com/firebase/agent-skills

Made for: Claude Code, Codex.

Or install agent-skills, the plugin that ships this one along with the rest of its 12 skills, 1 MCP server.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/firebase/agent-skills/firebase-basics.svg)](https://agentmods.dev/skills/firebase/agent-skills/firebase-basics)

Your own site

<a href="https://agentmods.dev/skills/firebase/agent-skills/firebase-basics"><img src="https://agentmods.dev/badge/skills/firebase/agent-skills/firebase-basics.svg" alt="Measured on agentmods" height="20"></a>

Per session 105 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,689 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin 97% copy Near-identical to another mod in the catalogue.

Token cost

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	$0.00105	$0.01689
Opus 5	$0.00053	$0.00844
Sonnet 5	$0.00021	$0.00338
Haiku 4.5	$0.00011	$0.00169

Measured 3d ago against content hash a80bfcc76a21, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

firebase-basics scanned grade A with 0 findings 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

97% identical to firebase-basics — 240 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/firebase-basics/SKILL.md · 149 lines

How it starts

The opening of the file, as written. The whole thing — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Prerequisites

Complete these setup steps before proceeding:

Local Environment Setup: Verify the environment is properly set up so we can use Firebase tools:
- Run npx -y firebase-tools@latest --version to check if the Firebase CLI is installed.
- Verify if the Firebase MCP server is installed using your existing tools.
- CRITICAL: Before configuring any extensions or agent environments below, you MUST read references/local-env-setup.md.
- DO NOT SKIP this step: if 'firebase-basics' is the only Firebase skill available to you, you must follow the reference for your agent environment to set up the full suite of Firebase skills:
  - Gemini CLI: Review references/setup/gemini_cli.md
  - Antigravity: Review references/setup/antigravity.md
  - Android Studio: Review references/setup/android_studio.md
  - Claude Code: Review references/setup/claude_code.md
  - Cursor: Review references/setup/cursor.md
  - GitHub Copilot: Review references/setup/github_copilot.md
  - Other Agents: Review references/setup/other_agents.md
Authentication: Ensure you are logged in to Firebase so that commands have the correct permissions. Run npx -y firebase-tools@latest login. For environments without a browser (e.g., remote shells), use npx -y firebase-tools@latest login --no-localhost.
- The command should output the current user.
- If you are not logged in, follow the interactive instructions from this command to authenticate.
Active Project: Most Firebase tasks require an active project context.
[!IMPORTANT] For Agents: Before proceeding with project configuration, you MUST pause and ask the developer if they prefer to:
1. Provide an existing Firebase Project ID, or
2. Create a new Firebase project.
- If using an existing Project ID:
  1. Check the current project by running npx -y firebase-tools@latest use.
  2. If the command outputs Active Project: <project-id>, confirm with the user if this is the intended project.
  3. If not, or if no project is active, set the project provided by the user:
```
npx -y firebase-tools@latest use <PROJECT_ID>
```
- If creating a new project: Run the following command to create it:
```
npx -y firebase-tools@latest projects:create <project-id> --display-name "<display-name>"
```
  Note: The <project-id> must be 6-30 characters, lowercase, and can contain digits and hyphens. It must be globally unique.

Read the full file on GitHub · 149 lines

Files

What ships with it

19 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

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 · 149 lines · 105 tokens per session scan A a80bfcc76a21

Subscribe to this mod's changes

firebase-basics is a skill published in the GitHub repository firebase/agent-skills (430 stars, last pushed 6d ago), licensed Apache-2.0. It adds 105 tokens to every session and 1,689 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. It is 97% identical to firebase-basics, differing in 240 lines, and is treated as a copy.

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