Stream Builder

What it does

When your agent uses it

• Tasks that involve Design systems
• Tasks that involve CSS and styling
• Tasks that involve Cross-platform mobile apps

Example prompts

• “build me a ... app”
• “scaffold”
• “create a new ...”
• “/stream-builder”

Requirements

• Node.js
• A credential in STREAM_API_KEY
• A credential in STREAM_API_SECRET
• Pre-approved tools (allowed-tools): Read, Write, Edit, Glob, Grep, Bash(stream *), Bash(npx skills add GetStream/agent-skills *), Bash(npx *), Bash(npm install *), Bash(npm run *), Bash(node -e *), Bash(node --version), Bash(openssl rand *), Bash(mv .scaffold*), Bash(rm -rf .scaffold), Bash(ls *), Bash(test *), Bash(grep *), Bash(cat package.json), Bash(cat pubspec.yaml), Bash(cat go.mod), Bash(cat requirements.txt), Bash(cat pyproject.toml), Bash(echo .env*), WebFetch(domain:getstream.io), WebFetch(domain:www.npmjs.com), WebFetch(domain:github.com)

Workflow steps

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

1. 1Package manager
2. 2Auth
3. 3Create org + app
4. 4Scaffold + .env + SDKs + Configure - SEQUENTIALLY
5. 5Generate code and UI
6. 6Verify
7. 7Start dev server
8. 8Summary

What it can do on your machine

Read from SKILL.md and the folder at commit 7ddc202. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Read
  • Write
  • Edit
  • Glob
  • Grep
  • Bash(stream *)
  • Bash(npx skills add GetStream/agent-skills *)
  • Bash(npx *)
  • Bash(npm install *)
  • Bash(npm run *)

  …and 17 more on the same allowed-tools line.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • npx
  • npm
  • bash
  • openssl
  • node
  • tsc

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

• Network

  Hosts in commands or code, which the agent is likely to contact:

  • github.com
  • getstream.io

  Also links to:

  • beta.dashboard.getstream.io
  • ui.shadcn.com

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

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • STREAM_API_KEY
  • STREAM_API_SECRET

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

Context cost

Stream Builder loads about 5.4k tokens when it runs, and up to ~39k if it reads all its reference files. Until then it costs about 122 tokens; SKILL.md has 2,488 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~122

When it runs · the whole SKILL.md, loaded when a task matches

~5.4k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~39k

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

• NoteMentions a .env fileSKILL.md:21

  Bash(echo .env*),

• NoteMentions a .env fileSKILL.md:49

  am env` - local CLI, no network; writes `.env` (gitignored by the Next.js scaffold's default; Task B verifies).

• NoteMentions a .env fileSKILL.md:65

  Next.js scaffold's `.gitignore` ignores `.env*` by default. |

• NoteMentions a .env fileSKILL.md:69

  (local CLI, no network at this step) | `.env` in the project root with `STREAM_API_KEY` + `STREAM_API_SECRET`. Task B v

• NoteMentions a .env fileSKILL.md:75

  - `.env` is written by the Stream CLI directly, not by the agent, and is not transmitted into the conversation.

• NoteMentions a .env fileSKILL.md:135

  ### Step 3: Scaffold + .env + SDKs + Configure - SEQUENTIALLY

• NoteMentions a .env fileSKILL.md:146

  6. Continue with Task B (.env), Task C (SDKs), Task D (CLI config).

• NoteMentions a .env fileSKILL.md:184

  **Task B: .env** - run AFTER scaffold so the `.env` lands inside the project directory.

• NoteMentions a .env fileSKILL.md:186

  **First, verify `.env*` is gitignored** (the `stream` skill's [`RULES.md`](../stream/RULES.md) > Secrets). The Next.js s

• NoteMentions a .env fileSKILL.md:189

  && grep -qE "^\.env" .gitignore || echo ".env*" >> .gitignore'

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 2,488 words (~5,392 tokens).

name

stream-builder

allowed-tools

Read, Write, Edit, Glob, Grep, Bash(stream *), Bash(npx skills add GetStream/agent-skills *), Bash(npx *), Bash(npm install *), Bash(npm run *), Bash(node -e *), Bash(node --version), Bash(openssl rand *), Bash(mv .scaffold*), Bash(rm -rf .scaffold), Bash(ls *), Bash(test *), Bash(grep *), Bash(cat package.json), Bash(cat pubspec.yaml), Bash(cat go.mod), Bash(cat requirements.txt), Bash(cat pyproject.toml), Bash(echo .env*), WebFetch(domain:getstream.io), WebFetch(domain:www.npmjs.com), WebFetch(domain:github.com)

license

See LICENSE in repository root

metadata.author

GetStream

Read the full SKILL.md on GitHub

Files

SKILL.md and 12 other files (references) in .agents/skills/stream-builder of adrianhajdin/react-native-lingua.

• SKILL.md
• builder-ui.md
• enhance.md
• references/CHAT-blueprints.md
• references/CHAT.md
• references/CROSS-PRODUCT.md
• references/FEEDS-blueprints.md
• references/FEEDS.md
• references/MODERATION-blueprints.md
• references/MODERATION.md
• references/VIDEO-blueprints.md
• references/VIDEO.md
• sdk.md

Open the folder on GitHubat commit 7ddc202