cf

name: cf description: Guide for using the cf (Common Fabric) CLI to interact with pieces, patterns, and the Common Fabric. Use this skill when deploying patterns, managing pieces, linking data between pieces, or debugging pattern execution. Triggers include requests to "deploy this pattern", "call a handler", "link these pieces", "get data from piece", or "test this pattern locally".

CF CLI

The cf CLI is the command-line interface for Common Fabric. Use --help for current commands:

deno task cf --help           # Top-level commands
deno task cf piece --help     # Piece operations
deno task cf check --help     # Type checking

Environment Setup

Identity key (required for most operations):

ls -la cf.key                  # Check for existing

# Never overwrite an existing key file — existing identity-scoped data
# becomes invisible under a new identity.

# Default: a fresh, UNIQUE key. Use this for normal pattern dev and for any
# server (local, shared, or remote).
deno run -A packages/cli/mod.ts id new > cf.key

# To match a browser identity registered with a recovery phrase:
deno run -A packages/cli/mod.ts id from-mnemonic -- phrase.txt > cf.key

# To reproduce a key from your OWN secret passphrase (unique to you; pass via
# file or stdin to keep it out of shell history):
deno run -A packages/cli/mod.ts id derive -- passphrase.txt > cf.key

Both id derive and id from-mnemonic accept the secret three ways: as a file (-- <file>), on stdin (-, or no argument), or as an inline positional argument. Prefer a file or stdin for real secrets — an inline argument is visible in shell history and to other processes via ps. A single trailing newline is stripped from file/stdin input, so echo/editor input matches the equivalent inline value.

Note: id derive (passphrase) and id from-mnemonic (BIP-39 phrase) use different derivations and produce different DIDs from the same text. Use from-mnemonic to match browser mnemonic login; see docs/development/SHARED_IDENTITY.md.

IMPORTANT: Do NOT use deno task cf id new > file — the deno task wrapper prints ANSI-colored preamble to stdout, which pollutes the key file. Always use deno run -A packages/cli/mod.ts when redirecting output.

Environment variables (avoid repeating flags):

export CF_API_URL=http://localhost:8000  # local dev default; only target a remote instance when the task explicitly requires it — remote set/rm/setsrc mutate shared state
export CF_IDENTITY=./cf.key

Identity visibility footgun: If CLI and browser use different DIDs, the same piece should still load and unscoped/PerSpace data should remain visible, but PerUser, PerSession, favorites, drafts, and home-space state may look empty or default. For identity-sensitive local work, use one key everywhere — generate it with id new and import the CLI PKCS8/PEM key in the browser via Import CLI Key. See docs/development/SHARED_IDENTITY.md.

Experimental flags must be set as env vars on both servers AND CLI commands. See docs/development/EXPERIMENTAL_OPTIONS.md for available flags.

Local servers: See docs/development/LOCAL_DEV_SERVERS.md

Quick Command Reference

Check Command Flags

deno task cf check compiles and evaluates patterns. Key flags:

Common usage:

deno task cf check pattern.tsx              # Compile + execute (quiet on success)
deno task cf check pattern.tsx --no-run     # Type check only (fast)
deno task cf check pattern.tsx --no-check   # Skip types, just execute
deno task cf check pattern.tsx --show-transformed  # Debug compiler transforms
deno task cf check pattern.tsx --verbose-errors     # Detailed error context

Core Workflow: setsrc vs new

Critical pattern: After initial deployment, use setsrc to iterate:

# First time only
deno task cf piece new pattern.tsx ...
# Output: Created piece bafyreia... <- Save this ID!

# ALL subsequent iterations
deno task cf piece setsrc pattern.tsx --piece bafyreia... ...

Why: new creates duplicate pieces. setsrc updates in-place.

JSON Input Format

All values to set and call must be valid JSON:

# Strings need nested quotes
echo '"hello world"' | deno task cf piece set ... title

# Numbers are bare
echo '42' | deno task cf piece set ... count

# Objects
echo '{"name": "John"}' | deno task cf piece set ... user

Gotcha: Always step After set or call

Neither piece set nor piece call triggers recomputation automatically. You must run piece step after either one to get fresh computed values.

# After setting data:
echo '[...]' | deno task cf piece set --piece ID expenses ...
deno task cf piece step --piece ID ...  # Required!
deno task cf piece get --piece ID totalSpent ...

# After calling a handler:
deno task cf piece call --piece ID addItem '{"title": "Test"}'
deno task cf piece step --piece ID ...  # Required!
deno task cf piece inspect --piece ID ...

Handler testing workflow (deploy → call → step → inspect):

# 1. Deploy
deno task cf piece new pattern.tsx -i key -a url -s space
# 2. Call a handler
deno task cf piece call --piece ID handlerName '{"arg": "value"}' ...
# 3. Step to process
deno task cf piece step --piece ID ...
# 4. Inspect result
deno task cf piece inspect --piece ID ...
# 5. Repeat 2-4 for each handler

See docs/common/workflows/handlers-cli-testing.md for the full workflow and docs/development/debugging/cli-debugging.md for debugging.

Troubleshooting

FUSE mount wrapper mismatch

On some local setups, the installed cf wrapper (for example dist/cf) can lag behind the source CLI and reject newer fuse mount flags such as -s/--space, even when deno task cf fuse mount --help supports them.

Symptom:

cf fuse mount /tmp/cf -s my-space
# error: Unknown option "-s"

Fix: use the source CLI through the repo task wrapper instead (cd to the labs repo root first):

export CF_IDENTITY=./cf.key
export CF_API_URL=http://localhost:8000

deno task cf fuse mount /tmp/cf -s my-space

This matters because preconnecting the space is required for writable FUSE mounts; auto-discovered spaces may appear writable but silently drop writes.

References

• packages/patterns/system/default-app.tsx - System pieces (allPieces list lives here)
• docs/common/workflows/handlers-cli-testing.md - Handler testing
• docs/development/debugging/cli-debugging.md - CLI debugging