Name: Stegstr
Logo: https://stegstr.com/images/logo.png
Description: Stegstr is a steganographic social networking app. It hides Nostr messages inside images using LSB/DWT steganography. Users can embed their feed (posts, DMs) into PNG images and share them anywhere; recipients use Detect to load the hidden content. No registration required. Works offline. Available for macOS, Windows, Linux, and Android.
Communication: Web
Author: https://github.com/brunkstr/Stegstr

# Capabilities (for AI agents and automation)
Capability-Decode: Decode Stegstr payload from a PNG file. Input: file path to PNG. Output: raw payload bytes (UTF-8 JSON bundle when decrypted, or base64 if binary). Use CLI: stegstr decode <path> or desktop app Detect.
Capability-Embed: Embed a payload into a cover PNG. Input: cover image path, output path, payload (UTF-8 JSON or base64). Output: path to written PNG. Use CLI: stegstr embed <cover.png> -o <out.png> --payload <json_or_path> or desktop app Embed.

# Formats
Format-Image: PNG (lossless required; JPEG/lossy will corrupt hidden data)
Payload-Format: Raw layer: magic STEGSTR (7 bytes) + 4-byte big-endian length + payload. Decrypted payload: JSON bundle { "version": 1, "events": [ Nostr events ] }. See Wiki How It Works.
Schema-Bundle: https://github.com/brunkstr/Stegstr/blob/main/schema/bundle.schema.json

# Programmatic access (CLI)
CLI-Page: https://stegstr.com/wiki/cli.html
For-Agents: https://stegstr.com/wiki/for-agents.html

# CLI: how to build (run these commands)
CLI-Build-Step1: git clone https://github.com/brunkstr/Stegstr.git
CLI-Build-Step2: cd Stegstr/src-tauri
CLI-Build-Step3: cargo build --release --bin stegstr-cli
CLI-Binary: Stegstr/src-tauri/target/release/stegstr-cli (Windows: target/release/stegstr-cli.exe)
CLI-Prerequisite: Rust (latest stable). Install from https://rustup.rs

# CLI: commands (exact syntax; replace IMAGE.png, COVER.png, OUT.png, MESSAGE, BUNDLE.json, HEX64 with concrete values)
CLI-Command-Decode-Raw: stegstr-cli decode IMAGE.png
CLI-Command-Decode-Decrypt: stegstr-cli decode IMAGE.png --decrypt
CLI-Command-Detect: stegstr-cli detect IMAGE.png
CLI-Command-Embed-String: stegstr-cli embed COVER.png -o OUT.png --payload PAYLOAD_STRING
CLI-Command-Embed-File: stegstr-cli embed COVER.png -o OUT.png --payload @BUNDLE.json
CLI-Command-Embed-Encrypt: stegstr-cli embed COVER.png -o OUT.png --payload @BUNDLE.json --encrypt
CLI-Command-Post-Stdout: stegstr-cli post "MESSAGE"
CLI-Command-Post-File: stegstr-cli post "MESSAGE" --output bundle.json
CLI-Command-Post-WithKey: stegstr-cli post "MESSAGE" --privkey-hex HEX64 --output bundle.json

# CLI: behavior
CLI-Exit: All commands exit 0 on success, non-zero on error. Decode/detect write to stdout; embed writes to -o path; post writes to --output path or stdout.
CLI-Output-Decode: Without --decrypt: raw payload (UTF-8 JSON text or base64:DATA). With --decrypt: JSON bundle { "version": 1, "events": [ ... ] }.
CLI-Output-Detect: JSON bundle { "version": 1, "events": [ ... ] } (same as decode --decrypt).
CLI-Output-Post: JSON bundle { "version": 1, "events": [ { "kind": 1, "content": "... Sent by Stegstr.", ... } ] }.

# Download URLs (one-click, direct)
Download-macOS: https://github.com/brunkstr/Stegstr/releases/latest/download/Stegstr-macOS.dmg
Download-Windows: https://github.com/brunkstr/Stegstr/releases/latest/download/Stegstr-Windows.exe
Download-Linux-deb: https://github.com/brunkstr/Stegstr/releases/latest/download/Stegstr-Linux.deb
Download-Linux-AppImage: https://github.com/brunkstr/Stegstr/releases/latest/download/Stegstr-Linux.AppImage

# Key pages
Getting-Started: https://stegstr.com/getting-started.html
Wiki: https://stegstr.com/wiki/index.html
CLI: https://stegstr.com/wiki/cli.html
How-It-Works: https://stegstr.com/wiki/how-it-works.html
FAQ: https://stegstr.com/wiki/faq.html
For-Agents: https://stegstr.com/wiki/for-agents.html
GitHub: https://github.com/brunkstr/Stegstr