firebase-development-add-feature SKILL.md skillB
firebase-development-add-feature from aiskillstore/marketplace is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add aiskillstore/marketplace/firebase-development-add-feature@git:20260113.222b7dePins git:20260113.222b7de in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- aiskillstore/marketplace
- Path
skills/2389-research/firebase-development/add-feature/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260113.222b7de, committed Jan 13, 2026
- Size
- 6,634 bytes
- Repository stars
- 471
- License
- none declared
This skill should be used when adding features to existing Firebase projects. Triggers on "add function", "create endpoint", "new tool", "add api", "new collection", "implement", "build feature". Guides TDD workflow with test-first development, security rules, and emulator verification.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Firebase Add Feature
## Overview
This sub-skill guides adding new features to existing Firebase projects using TDD. It handles Cloud Functions, Firestore collections, and API endpoints.
**Key principles:**
- Write tests FIRST (TDD requirement)
- Use `{success, message, data?}` response pattern
- Every file starts with ABOUTME comments
- Verify with emulators before claiming done
## When This Sub-Skill Applies
- Adding a new Cloud Function
- Creating a new Firestore collection with rules
- Adding an API endpoint to Express app
- User says: "add function", "create endpoint", "new collection", "implement"
**Do not use for:**
- Initial project setup → `firebase-development:project-setup`
- Debugging → `firebase-development:debug`
- Code review → `firebase-development:validate`
## TodoWrite Workflow
Create checklist with these 12 steps:
### Step 1: Identify Feature Type
Determine what's being added:
- **HTTP Endpoint** - API route (GET/POST/etc.)
- **Firestore Trigger** - Runs on document changes
- **Scheduled Function** - Cron job
- **Callable Function** - Client SDK calls
- **New Collection** - Firestore collection with rules
### Step 2: Check Existing Architecture
…Read the whole file at its exact version.
How to install
mdr add aiskillstore/marketplace/firebase-development-add-feature@sha256:1116b4eb6089480eThe line at the top of this page pins the label git:20260113.222b7de, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ij4ck7kfyqwieby6)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jan 13, 2026.
Audit of the latest version
- fail: No link to a raw IP address (matched: http://127.0.0.1:4000)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6634 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No script tag
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
aiskillstore/marketplace · 471 stars · license none declared · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ij4ck7kfyqwieby6 GET https://markdownregistry.com/api/v1/resolve?ref=aiskillstore/marketplace/firebase-development-add-feature GET https://markdownregistry.com/api/v1/blob/1116b4eb6089480e88944ba99374f38f6112e5c9a9a9fe23998872613ca1459a
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Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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