<p align="center">
<img src="https://raw.githubusercontent.com/alohaninja/shift/main/assets/shift-icon.png" alt="SHIFT" width="200" />
</p>
<h1 align="center">SHIFT</h1>
<p align="center">
<strong>Smart Hybrid Input Filtering & Transformation</strong>
</p>
<p align="center">
A multimodal preflight layer that automatically adapts inputs before they reach an AI model.
</p>
<p align="center">
<a href="https://github.com/alohaninja/shift/actions"><img src="https://github.com/alohaninja/shift/workflows/CI/badge.svg" alt="CI"></a>
<a href="https://github.com/alohaninja/shift/releases"><img src="https://img.shields.io/github/v/release/alohaninja/shift" alt="Release"></a>
<a href="https://crates.io/crates/shift-preflight-cli"><img src="https://img.shields.io/crates/v/shift-preflight-cli" alt="crates.io"></a>
<a href="https://www.npmjs.com/package/@shift-preflight/runtime"><img src="https://img.shields.io/npm/v/@shift-preflight/runtime?label=runtime" alt="npm runtime"></a>
<a href="https://www.npmjs.com/package/@shift-preflight/opencode-plugin"><img src="https://img.shields.io/npm/v/@shift-preflight/opencode-plugin?label=opencode-plugin" alt="npm opencode-plugin"></a>
<a href="https://opensource.org/licenses/Apache-2.0"><img src="https://img.shields.io/badge/License-Apache_2.0-blue.svg" alt="License: Apache-2.0"></a>
</p>
<p align="center">
<a href="https://shift-ai.dev">Website</a> •
<a href="https://shift-ai.dev/guide/">Guide</a> •
<a href="#install">Install</a> •
<a href="https://github.com/alohaninja/shift/blob/main/CHANGELOG.md">Changelog</a>
</p>
---
## What it does
SHIFT sits between your application and the model API. Every request passes through a pipeline that **inspects**, **evaluates**, and **transforms** media inputs so they conform to provider constraints.
<p align="center">
<img src="https://raw.githubusercontent.com/alohaninja/shift/main/assets/flow.svg" alt="SHIFT pipeline flow" width="900" />
</p>
**Before SHIFT:** oversized images, unsupported formats, and bloated payloads cause hard failures (400 errors, token waste, session crashes).
**After SHIFT:** every request is valid, optimized, and tuned to your cost/quality preference.
## Token savings
SHIFT estimates per-provider token savings for every run. Both OpenAI and Anthropic charge tokens based on image dimensions — resizing images before they hit the API reduces cost.
| 4000×3000 hero image (balanced) | 4000×3000 | 2048×1536 | 765 → 765 | 1,568 → 1,568 |
| 4000×3000 hero image (economy) | 4000×3000 | 1024×768 | 765 → 765 | 1,568 → 1,082 (−31%) |
| 1254×1254 app icon (economy) | 1254×1254 | 1024×1024 | 765 → 765 | 1,568 → 1,405 (−10%) |
| SVG diagram → rasterized PNG | SVG | 512×256 PNG | 255 → 255 | 0 → 98 |
*Token estimates based on published provider formulas. OpenAI uses tile-based counting (GPT-4o/4.1 family, 512×512 tiles); Anthropic uses pixel-based (`w×h/750`, 1568px long-edge cap for standard models). Actual billing may vary by model — newer OpenAI models use patch-based counting, and Anthropic Opus 4.7 supports higher resolution (2576px, 4784 max tokens).*
### Sample report
```
=== SHIFT Report ===
Images found: 1
Images modified: 1
Images dropped: 0
Original size: 42262 bytes
Transformed size: 17018 bytes
Size reduction: 59.7%
Token Savings (estimated):
OpenAI: 765 -> 765 tokens (0.0% saved)
Anthropic: 1,568 -> 1,082 tokens (31.0% saved)
Per-image breakdown:
[0] 4000x3000 -> 1024x768 (OpenAI: 765 -> 765, Anthropic: 1,568 -> 1,082)
Actions:
[image 0] resize — 4000x3000 -> 1024x768
```
### Cumulative tracking
SHIFT automatically records run statistics to `~/.shift/stats.jsonl`. View cumulative savings with `shift-ai gain`:
```
$ shift-ai gain
=== SHIFT Cumulative Savings ===
Runs: 42
Images: 156 processed, 89 modified
Bytes: 247.3 MB saved
Token Savings (estimated):
OpenAI: 52,400 -> 12,300 tokens (76.5% saved)
Anthropic: 84,200 -> 28,100 tokens (66.6% saved)
```
```
$ shift-ai gain --daily
=== SHIFT Daily Token Savings ===
Date Runs Images OpenAI saved Anthropic saved
----------------------------------------------------------
2026-04-20 8 24 3,200 5,400
2026-04-21 12 42 4,800 8,200
2026-04-22 22 90 12,100 18,500
```
Use `shift-ai gain --format json` for machine-readable output.
## Runtime: AI SDK Middleware + HTTP Proxy
The `@shift-preflight/runtime` package (`runtime/` directory) provides two ways to integrate SHIFT into any AI agent or application:
**AI SDK Middleware** — transparent, in-process optimization for any [Vercel AI SDK](https://sdk.vercel.ai) app:
```typescript
import { shiftMiddleware } from "@shift-preflight/runtime";
import { wrapLanguageModel } from "ai";
const model = wrapLanguageModel({
model: anthropic("claude-sonnet-4-20250514"),
middleware: shiftMiddleware({ mode: "balanced" }),
});
```
**HTTP Proxy** — transparent reverse proxy for any agent in any language:
```bash
npx @shift-preflight/runtime proxy --port 8787 --mode balanced
# Point any agent at the proxy:
export ANTHROPIC_BASE_URL=http://localhost:8787 # Claude Code (no /v1 — SDK appends it)
# Codex CLI — add to ~/.codex/config.toml: openai_base_url = "http://localhost:8787"
```
See [`runtime/README.md`](runtime/README.md) for full documentation.
**OpenCode Plugin** — auto-starts the proxy on [OpenCode](https://opencode.ai) launch:
```json
{
"plugin": ["@shift-preflight/opencode-plugin"],
"provider": {
"anthropic": {
"options": {
"baseURL": "http://localhost:8787/v1"
}
}
}
}
```
See [`opencode-plugin/README.md`](opencode-plugin/README.md) for setup details.
## Agent integrations
The fastest way to configure all your agents at once:
```bash
shift-ai setup
```
This detects installed agents, configures each one, and optionally installs a
macOS LaunchAgent to keep the proxy running.
| **Any agent** | [Interactive setup](#setup) | `shift-ai setup` (auto-detects + configures) |
| [OpenCode](https://opencode.ai) | [Plugin](opencode-plugin/) (auto) | Plugin auto-starts proxy and sets `baseURL` |
| [Claude Code](https://claude.ai/code) | [`settings.json`](claude-code-hook/) | Writes `ANTHROPIC_BASE_URL` to `~/.claude/settings.json` |
| [Codex CLI](https://github.com/openai/codex) | [`config.toml`](codex-plugin/) | Writes `openai_base_url` to `~/.codex/config.toml` |
| Cursor | Settings UI (manual) | Paste URL into Settings > Models > Override OpenAI Base URL |
| AI SDK apps | Middleware (in-process) | `wrapLanguageModel({ middleware: shiftMiddleware() })` |
> **Gemini CLI** does not support API base URL overrides and is not currently supported.
### Quick per-agent setup
```bash
# Claude Code — env var (add to ~/.zshrc)
eval "$(shift-ai env claude-code)"
# Codex CLI — prints TOML snippet for ~/.codex/config.toml
shift-ai env codex
# List all agents and their config methods
shift-ai env --list
```
All agents share the same proxy on port 8787 — start it once and every agent benefits.
## Install
### Homebrew (macOS/Linux)
```bash
brew tap alohaninja/shift
brew install shift-ai
```
### Quick install script
```bash
Installs to `~/.local/bin`. Detects OS/arch automatically (macOS x86/arm, Linux x86/arm).
### From crates.io
```bash
cargo install shift-preflight-cli
```
### Pre-built binaries
Download from [GitHub Releases](https://github.com/alohaninja/shift/releases) — macOS (x86/arm) and Linux (x86/arm).
### From source
```bash
git clone https://github.com/alohaninja/shift.git && cd shift
cargo install --path shift-cli
```
### AI Agent Skill
If you use an AI coding agent (Claude Code, Cursor, Copilot, Windsurf, etc.):
```bash
npx skills add alohaninja/shift
```
This installs the `shift-ai-preflight` skill, which teaches your agent when and how to use SHIFT to optimize image payloads.
### Verify installation
```bash
shift-ai --version
shift-ai --help
# Quick validation — transform a sample payload
# Check stats tracking
shift-ai gain
```
## Quick start
```bash
# Transform an OpenAI request (stdin/stdout pipe)
# Transform an Anthropic request from a file
shift-ai request.json -p anthropic -m economy > safe_request.json
# See what would change without modifying anything
shift-ai request.json --dry-run -o report
# Compose with curl
-H "Authorization: Bearer $OPENAI_API_KEY" \
-H "Content-Type: application/json" \
-d @-
```
## Options
```
shift-ai [OPTIONS] [FILE]
Arguments:
[FILE] Input file (JSON request payload). Reads stdin if omitted.
Options:
-p, --provider <PROVIDER> Target provider [default: openai]
[openai, anthropic, claude]
-m, --mode <MODE> Drive mode [default: balanced]
[performance, balanced, economy]
--svg-mode <MODE> SVG handling [default: raster]
[raster, source, hybrid]
-o, --output <FORMAT> Output format [default: json]
[json, report, json-report, both]
--dry-run Show what would change without modifying
--profile <FILE> Custom provider profile JSON
--model <MODEL> Target model (overrides model in payload)
--no-stats Disable saving run statistics
-v, --verbose Verbose output
Commands:
shift-ai gain Show cumulative token savings
shift-ai gain --daily Day-by-day breakdown
shift-ai gain --format json Machine-readable output for dashboards
shift-ai proxy start Start the proxy daemon
shift-ai proxy stop Stop the proxy daemon
shift-ai proxy status Show proxy status
shift-ai proxy ensure Start if needed, no-op if healthy
shift-ai env <agent> Output config for an agent
shift-ai env --list List all supported agents and methods
shift-ai env --all Output config for all agents
shift-ai setup Interactive multi-agent setup
```
## Drive modes
| **performance** | Minimal transforms. Only enforce hard provider limits (max dimension, max file size). Preserve original fidelity. |
| **balanced** | Moderate optimization. Resize oversized images, recompress bloated files. Remove obvious waste. **Default.** |
| **economy** | Aggressive optimization. Downscale everything to 1024px, drop excess images beyond provider limits, minimize token usage. |
## SVG handling
Most AI model APIs reject SVG. SHIFT detects SVG inputs and handles them based on `--svg-mode`:
| **raster** | Rasterize SVG to PNG via `resvg` (default, provider-safe) |
| **source** | Replace the image with SVG XML as a text content block |
| **hybrid** | Rasterize to PNG and retain SVG source as text |
## Supported formats
**Detected and processed:**
| Raster images | PNG, JPEG, GIF, WebP, BMP, TIFF |
| Vector images | SVG (auto-rasterized to PNG) |
| Encodings | base64 data URIs, raw base64, URL references |
BMP and TIFF are auto-converted to PNG. SVGs are rasterized. Everything else passes through if it meets provider constraints.
## Provider profiles
Built-in constraints for the two major multimodal providers:
| **OpenAI** | 10 | 2048 px | 20 MB | -- |
| **Anthropic** | 20 | 8000 px | 5 MB | 1.15 MP |
Profiles include per-model overrides (gpt-4o, gpt-4.1, claude-sonnet-4, etc.) and fall back to provider defaults for unknown models.
Custom profiles can be loaded with `--profile custom.json`.
## Library usage
SHIFT is split into two crates: `shift-preflight` (library) and `shift-preflight-cli` (binary, installs as `shift-ai`). The library can be used directly in Rust applications:
```toml
# Cargo.toml
[dependencies]
shift-preflight = "0.1"
```
```rust
use shift_preflight::{pipeline, ShiftConfig, DriveMode};
use serde_json::json;
let payload = json!({
"model": "gpt-4o",
"messages": [{
"role": "user",
"content": [{
"type": "image_url",
"image_url": {"url": "data:image/png;base64,..."}
}]
}]
});
let config = ShiftConfig {
mode: DriveMode::Balanced,
provider: "openai".to_string(),
..Default::default()
};
let (safe_payload, report) = pipeline::process(&payload, &config).unwrap();
eprintln!("{}", report); // what changed and why
```
## How it works
1. **Inspect** -- Detect every image in the request payload. Extract format (via magic bytes), dimensions, file size, encoding type. Handles base64 data URIs, raw base64, and URL references (fetched automatically).
2. **Evaluate** -- Load the provider profile for the target API. Compare each image's metadata against the constraints. Apply mode-specific rules to determine what actions are needed (resize, recompress, convert, rasterize, drop).
3. **Transform** -- Execute the actions. Resize preserves aspect ratio using Lanczos3 filtering. SVGs are rasterized with `resvg` (supports gradients, text, viewBox). BMP/TIFF are converted to PNG. JPEG recompression uses mode-tuned quality levels.
4. **Reconstruct** -- Rebuild the original payload with transformed images slotted back in. Output is a valid JSON request ready to send to the API.
## Project structure
```
shift/
├── shift-core/ Library crate: shift-preflight (all processing logic)
│ └── src/
│ ├── inspector/ Format detection, metadata extraction
│ ├── policy/ Provider profiles, constraint evaluation, rules
│ ├── transformer/ Image resize, recompress, SVG rasterize, convert
│ ├── payload/ OpenAI + Anthropic message format parse/reconstruct
│ ├── pipeline.rs Orchestrator: inspect -> policy -> transform
│ ├── cost.rs Token estimation (OpenAI tile, Anthropic pixel)
│ ├── stats.rs Persistent run statistics, gain summaries
│ ├── report.rs Transformation report with token savings
│ └── mode.rs DriveMode, SvgMode, ShiftConfig
├── shift-cli/ Binary crate: shift-preflight-cli → shift-ai
│ └── src/
│ ├── main.rs CLI entry point + existing commands
│ ├── proxy.rs Proxy daemon lifecycle (start/stop/ensure)
│ ├── env.rs Agent env var generation
│ └── setup.rs Interactive multi-agent setup
├── runtime/ @shift-preflight/runtime (TS middleware + proxy)
├── opencode-plugin/ @shift-preflight/opencode-plugin (OpenCode)
├── claude-code-hook/ Claude Code integration (settings + installer)
├── codex-plugin/ Codex CLI integration (env var + installer)
├── launchagent/ macOS LaunchAgent plist for auto-start
├── profiles/ Provider constraint JSON (embedded at compile time)
├── tests/
│ ├── fixtures/ Test images and sample payloads
│ └── docker/ Dockerfiles for cross-distro CI (Ubuntu, Arch)
└── .github/workflows/ CI + Linux distro tests
```
## Roadmap (v2+)
- **Video**: frame sampling, keyframe extraction, resolution downscale
- **Audio**: compression, transcription to text
- **Documents**: chunking, summarization, text extraction
- **Smart image selection**: near-duplicate detection, keep most informative
- **Caption fallback**: replace low-value images with text descriptions
- **Adaptive policies**: dynamic adjustment based on request size and latency targets
## License
Apache-2.0