diff --git a/.coverage b/.coverage
index cea8ccf..9f429c5 100644
Binary files a/.coverage and b/.coverage differ
diff --git a/REFACTOR.md b/REFACTOR.md
new file mode 100644
index 0000000..be2c882
--- /dev/null
+++ b/REFACTOR.md
@@ -0,0 +1,87 @@
+# Refactoring Plan
+
+Generated: 2026-02-12
+Scope: `tensors/` (all modules) + `tests/`
+
+## Summary
+
+11 issues found: 3 high priority, 5 medium priority, 3 low priority.
+
+## High Priority
+
+### [ ] Extract common HTTP request pattern in api.py
+- **Location**: `api.py:38-108`
+- **Problem**: `fetch_civitai_model_version`, `fetch_civitai_model`, and `fetch_civitai_by_hash` share nearly identical try/except/error-handling blocks (3x duplication).
+- **Impact**: Changing error handling or adding retry logic requires editing 3+ places. Easy to introduce inconsistencies (e.g., `fetch_civitai_model_version` lacks the Progress spinner that the other two have).
+- **Action**: Extract a `_api_get(url, api_key, console, spinner_msg=None) -> dict | None` helper that handles GET, 404 check, error printing, and optional Progress spinner. Each fetch function becomes a one-liner calling this helper.
+
+### [ ] Eliminate module-level console singleton in cli.py
+- **Location**: `cli.py:67`
+- **Problem**: `console = Console()` at module level is used by 6 helper functions (`_output_info_json`, `_save_metadata`, `_resolve_by_hash`, `_resolve_by_model_id`, `_prepare_download_dir`, `_display_download_info`) via closure rather than parameter passing.
+- **Impact**: Impossible to inject a test console into helpers, prevents output capture in tests, creates hidden coupling. Commands pass `console` to API/display functions but helpers silently use the global.
+- **Action**: Add `console: Console` parameter to all helper functions. Pass the module-level console from command functions. This makes the dependency explicit and testable.
+
+### [ ] Remove or use unused `safetensors` dependency
+- **Location**: `pyproject.toml:8`
+- **Problem**: `safetensors>=0.4.0` is listed as a runtime dependency but never imported anywhere. The code does manual binary parsing in `safetensor.py`.
+- **Impact**: Unnecessary install bloat. Users install a native extension library they don't need. Confusing for contributors.
+- **Action**: Remove `safetensors` from `[project.dependencies]` since manual parsing is the intended approach.
+
+## Medium Priority
+
+### [ ] Deduplicate output dict construction in cli.py
+- **Location**: `cli.py:126-133` and `cli.py:154-161`
+- **Problem**: `_output_info_json` and `_save_metadata` construct the same dict structure independently.
+- **Impact**: Adding a new field to info output requires editing two places.
+- **Action**: Extract `_build_info_dict(file_path, sha256_hash, local_metadata, civitai_data) -> dict` and call it from both functions.
+
+### [ ] Extract API timeout and chunk size constants
+- **Location**: `api.py:43,70,97,175` and `safetensor.py:67`
+- **Problem**: `timeout=30.0` appears 4 times in api.py. Chunk sizes (`1024 * 1024` in api.py, `1024 * 1024 * 8` in safetensor.py) are inline magic numbers.
+- **Impact**: Changing timeout or chunk size requires hunting through code.
+- **Action**: Add `API_TIMEOUT = 30.0`, `DOWNLOAD_CHUNK_SIZE = 1024 * 1024` to config.py or at module top. Add `HASH_CHUNK_SIZE = 1024 * 1024 * 8` to safetensor.py constants section.
+
+### [ ] Rename `_format_size` and `_format_count` to public API
+- **Location**: `display.py:23,32`
+- **Problem**: `_format_size` is imported and used by `cli.py:36` as a cross-module API but has a private underscore prefix. Same for `_format_count` which could be useful externally.
+- **Impact**: Violates Python naming convention. Underscore-prefixed names signal "don't import this" but the codebase does.
+- **Action**: Rename to `format_size` and `format_count`. Update all imports.
+
+### [ ] Deduplicate Progress spinner setup in api.py
+- **Location**: `api.py:61-66,88-93,166-171`
+- **Problem**: The `Progress(SpinnerColumn(), TextColumn(...), console=..., transient=True)` pattern is repeated 3 times with identical configuration.
+- **Impact**: Changing spinner appearance requires 3 edits.
+- **Action**: Extract `_spinner(console, description)` context manager helper or a factory function. This pairs well with the HTTP helper extraction in High Priority #1.
+
+### [ ] Add shared console fixture to tests
+- **Location**: `tests/test_tensors.py:284,291,298,...`
+- **Problem**: `Console(force_terminal=True, width=80)` is created ~15 times across test methods.
+- **Impact**: Changing test console config requires editing every test.
+- **Action**: Add a `console` fixture to `conftest.py` and use it across all test classes.
+
+## Low Priority
+
+### [ ] Replace hardcoded command list in main()
+- **Location**: `cli.py:403`
+- **Problem**: `arg not in ("info", "search", "get", "dl", "download", "config")` is a manually maintained list of known commands for legacy invocation detection.
+- **Impact**: Adding a new command requires remembering to update this list, or legacy mode will swallow it.
+- **Action**: Derive the command list from `app.registered_commands` or Typer's command registry dynamically.
+
+### [ ] Strengthen display function tests
+- **Location**: `tests/test_tensors.py:279-385`
+- **Problem**: Most display tests only assert "should not raise" with no output verification.
+- **Impact**: Tests won't catch regressions in output format or content.
+- **Action**: Use `Console(record=True)` to capture output, then assert key strings appear in `console.export_text()`.
+
+### [ ] Add tests for untested pure functions
+- **Location**: `api.py:111-142,145-150,187-199,202-209`
+- **Problem**: `_build_search_params`, `_filter_results`, `_setup_resume`, `_get_dest_from_response` have no test coverage. These are pure/near-pure functions that are easy to test.
+- **Impact**: Logic errors in search parameter building or resume setup won't be caught.
+- **Action**: Add direct unit tests for each function. These don't need HTTP mocking since they're pure logic.
+
+## Notes
+
+- High Priority #1 (HTTP helper) and Medium #6 (spinner dedup) should be done together since the extracted helper will naturally absorb the spinner logic.
+- High Priority #2 (console singleton) should be done before Medium #7 (test fixture) since making console a parameter enables proper test injection.
+- Medium #4 (output dict) is a quick win that can be done independently.
+- Start with High Priority #3 (remove unused dep) as it's the simplest and lowest risk change.
diff --git a/pyproject.toml b/pyproject.toml
index b454891..75cf059 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,6 +11,9 @@ dependencies = [
     "typer>=0.15.0",
 ]
 
+[project.optional-dependencies]
+server = ["fastapi>=0.115", "uvicorn>=0.30"]
+
 [project.scripts]
 tsr = "tensors:main"
 
@@ -30,6 +33,8 @@ dev = [
     "pytest-cov>=4.1",
     "pre-commit>=3.6",
     "respx>=0.22.0",
+    "fastapi>=0.115",
+    "uvicorn>=0.30",
 ]
 
 [tool.ruff]
@@ -56,6 +61,9 @@ ignore = [
     "PLR0913",  # Too many arguments - CLI commands need many options
 ]
 
+[tool.ruff.lint.per-file-ignores]
+"tests/**" = ["PLR2004", "ARG002", "TC001", "TC003"]
+
 [tool.ruff.lint.isort]
 known-first-party = ["tensors"]
 
@@ -79,6 +87,10 @@ ignore_missing_imports = false
 module = ["safetensors.*"]
 ignore_missing_imports = true
 
+[[tool.mypy.overrides]]
+module = ["uvicorn.*"]
+ignore_missing_imports = true
+
 [tool.pytest.ini_options]
 testpaths = ["tests"]
 addopts = "-v --cov=tensors --cov-report=term-missing"
diff --git a/tensors/cli.py b/tensors/cli.py
index a898924..30e1a68 100644
--- a/tensors/cli.py
+++ b/tensors/cli.py
@@ -64,6 +64,8 @@ def _main(
     ] = False,
 ) -> None:
     """Read safetensor metadata, search and download CivitAI models."""
+
+
 console = Console()
 
 
@@ -395,12 +397,71 @@ def config(
         console.print("[dim]Set API key with: tsr config --set-key YOUR_KEY[/dim]")
 
 
+@app.command()
+def generate(
+    prompt: Annotated[str, typer.Argument(help="Text prompt for image generation.")],
+    host: Annotated[str, typer.Option(help="sd-server address.")] = "127.0.0.1",
+    port: Annotated[int, typer.Option(help="sd-server port.")] = 1234,
+    output: Annotated[str, typer.Option("-o", help="Output directory.")] = ".",
+    negative_prompt: Annotated[str, typer.Option("-n", help="Negative prompt.")] = "",
+    width: Annotated[int, typer.Option("-W", help="Image width.")] = 512,
+    height: Annotated[int, typer.Option("-H", help="Image height.")] = 512,
+    steps: Annotated[int, typer.Option(help="Sampling steps.")] = 20,
+    cfg_scale: Annotated[float, typer.Option(help="CFG scale.")] = 7.0,
+    seed: Annotated[int, typer.Option("-s", help="RNG seed (-1 for random).")] = -1,
+    sampler: Annotated[str, typer.Option(help="Sampler name.")] = "",
+    scheduler: Annotated[str, typer.Option(help="Scheduler name.")] = "",
+    batch_size: Annotated[int, typer.Option("-b", help="Number of images.")] = 1,
+) -> None:
+    """Generate images using a running sd-server."""
+    from tensors.generate import SDClient, Txt2ImgParams, save_images  # noqa: PLC0415
+
+    params = Txt2ImgParams(
+        prompt=prompt,
+        negative_prompt=negative_prompt,
+        width=width,
+        height=height,
+        steps=steps,
+        cfg_scale=cfg_scale,
+        seed=seed,
+        batch_size=batch_size,
+        sampler_name=sampler,
+        scheduler=scheduler,
+    )
+
+    with SDClient(host=host, port=port) as client:
+        console.print(f"[cyan]Generating {batch_size} image(s)...[/cyan]")
+        images = client.generate.txt2img(params)
+        paths = save_images(images, output)
+        for p in paths:
+            console.print(f"[green]Saved:[/green] {p}")
+
+
+@app.command()
+def serve(
+    host: Annotated[str, typer.Option(help="Wrapper API listen address.")] = "127.0.0.1",
+    port: Annotated[int, typer.Option(help="Wrapper API listen port.")] = 8080,
+    log_level: Annotated[str, typer.Option(help="Log level.")] = "info",
+) -> None:
+    """Start the sd-server wrapper API."""
+    try:
+        import uvicorn  # noqa: PLC0415
+
+        from tensors.server import create_app  # noqa: PLC0415
+    except ImportError:
+        console.print("[red]Missing server dependencies. Install with:[/red]")
+        console.print("  pip install tensors[server]")
+        raise typer.Exit(1) from None
+
+    uvicorn.run(create_app(), host=host, port=port, log_level=log_level)
+
+
 def main() -> int:
     """Main entry point."""
     # Handle legacy invocation: tsr <file.safetensors> -> tsr info <file>
     if len(sys.argv) > 1 and not sys.argv[1].startswith("-"):
         arg = sys.argv[1]
-        if arg not in ("info", "search", "get", "dl", "download", "config") and (
+        if arg not in ("info", "search", "get", "dl", "download", "config", "generate", "serve") and (
             arg.endswith(".safetensors") or arg.endswith(".sft") or Path(arg).exists()
         ):
             sys.argv = [sys.argv[0], "info", *sys.argv[1:]]
diff --git a/tensors/generate/__init__.py b/tensors/generate/__init__.py
new file mode 100644
index 0000000..5741ef3
--- /dev/null
+++ b/tensors/generate/__init__.py
@@ -0,0 +1,43 @@
+"""sd-server Python client — modular, httpx-based."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from tensors.generate._http import HttpTransport
+from tensors.generate.generation import GenerationAPI
+from tensors.generate.info import InfoAPI
+from tensors.generate.params import Img2ImgParams, Txt2ImgParams
+from tensors.generate.util import save_images
+
+__all__ = [
+    "Img2ImgParams",
+    "SDClient",
+    "Txt2ImgParams",
+    "save_images",
+]
+
+
+class SDClient:
+    """Composite client for sd-server.
+
+    Usage::
+
+        with SDClient() as c:
+            c.info.models()
+            images = c.generate.txt2img(Txt2ImgParams(prompt="a cat"))
+    """
+
+    def __init__(self, host: str = "127.0.0.1", port: int = 1234) -> None:
+        self._http = HttpTransport(f"http://{host}:{port}")
+        self.info = InfoAPI(self._http)
+        self.generate = GenerationAPI(self._http)
+
+    def close(self) -> None:
+        self._http.close()
+
+    def __enter__(self) -> SDClient:
+        return self
+
+    def __exit__(self, *exc: Any) -> None:
+        self.close()
diff --git a/tensors/generate/_http.py b/tensors/generate/_http.py
new file mode 100644
index 0000000..ea4337d
--- /dev/null
+++ b/tensors/generate/_http.py
@@ -0,0 +1,46 @@
+"""HTTP transport layer wrapping httpx."""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+import httpx
+
+logger = logging.getLogger(__name__)
+
+
+class HttpTransport:
+    def __init__(self, base_url: str, timeout: float = 300.0) -> None:
+        self._client = httpx.Client(base_url=base_url, timeout=timeout)
+        logger.debug("transport ready: %s", base_url)
+
+    def get(self, path: str) -> Any:
+        logger.debug("GET %s", path)
+        try:
+            r = self._client.get(path)
+            r.raise_for_status()
+        except httpx.HTTPStatusError as e:
+            logger.error("GET %s → %d: %s", path, e.response.status_code, e.response.text[:200])
+            raise
+        except httpx.RequestError as e:
+            logger.error("GET %s connection failed: %s", path, e)
+            raise
+        return r.json()
+
+    def post(self, path: str, json: dict[str, Any]) -> Any:
+        logger.debug("POST %s", path)
+        try:
+            r = self._client.post(path, json=json)
+            r.raise_for_status()
+        except httpx.HTTPStatusError as e:
+            logger.error("POST %s → %d: %s", path, e.response.status_code, e.response.text[:200])
+            raise
+        except httpx.RequestError as e:
+            logger.error("POST %s connection failed: %s", path, e)
+            raise
+        return r.json()
+
+    def close(self) -> None:
+        self._client.close()
+        logger.debug("transport closed")
diff --git a/tensors/generate/generation.py b/tensors/generate/generation.py
new file mode 100644
index 0000000..acc8b89
--- /dev/null
+++ b/tensors/generate/generation.py
@@ -0,0 +1,34 @@
+"""Image generation endpoints."""
+
+from __future__ import annotations
+
+import base64
+import logging
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from tensors.generate._http import HttpTransport
+    from tensors.generate.params import Img2ImgParams, Txt2ImgParams
+
+logger = logging.getLogger(__name__)
+
+
+class GenerationAPI:
+    def __init__(self, http: HttpTransport) -> None:
+        self._http = http
+
+    def txt2img(self, params: Txt2ImgParams) -> list[bytes]:
+        """Generate images from text prompt."""
+        logger.info("txt2img: '%s' %dx%d steps=%d", params.prompt[:60], params.width, params.height, params.steps)
+        data = self._http.post("/sdapi/v1/txt2img", params.to_body())
+        images = [base64.b64decode(img) for img in data["images"]]
+        logger.info("txt2img: got %d image(s)", len(images))
+        return images
+
+    def img2img(self, params: Img2ImgParams) -> list[bytes]:
+        """Generate images from image + text prompt."""
+        logger.info("img2img: '%s' strength=%.2f steps=%d", params.prompt[:60], params.denoising_strength, params.steps)
+        data = self._http.post("/sdapi/v1/img2img", params.to_body())
+        images = [base64.b64decode(img) for img in data["images"]]
+        logger.info("img2img: got %d image(s)", len(images))
+        return images
diff --git a/tensors/generate/info.py b/tensors/generate/info.py
new file mode 100644
index 0000000..abcb7ae
--- /dev/null
+++ b/tensors/generate/info.py
@@ -0,0 +1,42 @@
+"""Model and server info endpoints."""
+
+from __future__ import annotations
+
+import logging
+from typing import TYPE_CHECKING, Any
+
+if TYPE_CHECKING:
+    from tensors.generate._http import HttpTransport
+
+logger = logging.getLogger(__name__)
+
+
+class InfoAPI:
+    def __init__(self, http: HttpTransport) -> None:
+        self._http = http
+
+    def models(self) -> list[dict[str, Any]]:
+        """List loaded models (OpenAI /v1/models)."""
+        return self._http.get("/v1/models")["data"]  # type: ignore[no-any-return]
+
+    def sd_models(self) -> list[dict[str, Any]]:
+        """Detailed model info (sdapi)."""
+        return self._http.get("/sdapi/v1/sd-models")  # type: ignore[no-any-return]
+
+    def options(self) -> dict[str, Any]:
+        """Current server options."""
+        return self._http.get("/sdapi/v1/options")  # type: ignore[no-any-return]
+
+    def loras(self) -> list[dict[str, Any]]:
+        """Available LoRAs from --lora-model-dir."""
+        result: list[dict[str, Any]] = self._http.get("/sdapi/v1/loras")
+        logger.info("found %d lora(s)", len(result))
+        return result
+
+    def samplers(self) -> list[str]:
+        """Available sampler names."""
+        return [s["name"] for s in self._http.get("/sdapi/v1/samplers")]
+
+    def schedulers(self) -> list[str]:
+        """Available scheduler names."""
+        return [s["name"] for s in self._http.get("/sdapi/v1/schedulers")]
diff --git a/tensors/generate/params.py b/tensors/generate/params.py
new file mode 100644
index 0000000..be18ce8
--- /dev/null
+++ b/tensors/generate/params.py
@@ -0,0 +1,100 @@
+"""Generation parameter dataclasses."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import TYPE_CHECKING, Any
+
+if TYPE_CHECKING:
+    from pathlib import Path
+
+from tensors.generate.util import to_b64
+
+
+@dataclass
+class Txt2ImgParams:
+    prompt: str
+    negative_prompt: str = ""
+    width: int = 512
+    height: int = 512
+    steps: int = 20
+    cfg_scale: float = 7.0
+    seed: int = -1
+    batch_size: int = 1
+    sampler_name: str = ""
+    scheduler: str = ""
+    clip_skip: int = -1
+    lora: list[dict[str, Any]] | None = None
+
+    def to_body(self) -> dict[str, Any]:
+        body = {
+            "prompt": self.prompt,
+            "negative_prompt": self.negative_prompt,
+            "width": self.width,
+            "height": self.height,
+            "steps": self.steps,
+            "cfg_scale": self.cfg_scale,
+            "seed": self.seed,
+            "batch_size": self.batch_size,
+        }
+        if self.sampler_name:
+            body["sampler_name"] = self.sampler_name
+        if self.scheduler:
+            body["scheduler"] = self.scheduler
+        if self.clip_skip > 0:
+            body["clip_skip"] = self.clip_skip
+        if self.lora:
+            body["lora"] = self.lora
+        return body
+
+
+@dataclass
+class Img2ImgParams:
+    prompt: str
+    init_image: str | bytes | Path
+    negative_prompt: str = ""
+    width: int = -1
+    height: int = -1
+    steps: int = 20
+    cfg_scale: float = 7.0
+    denoising_strength: float = 0.75
+    seed: int = -1
+    batch_size: int = 1
+    sampler_name: str = ""
+    scheduler: str = ""
+    clip_skip: int = -1
+    mask: str | bytes | Path | None = None
+    inpainting_mask_invert: bool = False
+    lora: list[dict[str, Any]] | None = None
+    extra_images: list[str | bytes | Path] = field(default_factory=list)
+
+    def to_body(self) -> dict[str, Any]:
+        body: dict[str, Any] = {
+            "prompt": self.prompt,
+            "negative_prompt": self.negative_prompt,
+            "steps": self.steps,
+            "cfg_scale": self.cfg_scale,
+            "denoising_strength": self.denoising_strength,
+            "seed": self.seed,
+            "batch_size": self.batch_size,
+            "init_images": [to_b64(self.init_image)],
+        }
+        if self.width > 0:
+            body["width"] = self.width
+        if self.height > 0:
+            body["height"] = self.height
+        if self.mask is not None:
+            body["mask"] = to_b64(self.mask)
+        if self.inpainting_mask_invert:
+            body["inpainting_mask_invert"] = 1
+        if self.sampler_name:
+            body["sampler_name"] = self.sampler_name
+        if self.scheduler:
+            body["scheduler"] = self.scheduler
+        if self.clip_skip > 0:
+            body["clip_skip"] = self.clip_skip
+        if self.lora:
+            body["lora"] = self.lora
+        if self.extra_images:
+            body["extra_images"] = [to_b64(img) for img in self.extra_images]
+        return body
diff --git a/tensors/generate/util.py b/tensors/generate/util.py
new file mode 100644
index 0000000..4014115
--- /dev/null
+++ b/tensors/generate/util.py
@@ -0,0 +1,37 @@
+"""Utility functions for image encoding and file I/O."""
+
+import base64
+import logging
+from pathlib import Path
+
+logger = logging.getLogger(__name__)
+
+
+def to_b64(image: str | bytes | Path) -> str:
+    """Convert a file path, raw bytes, or base64 string to base64."""
+    if isinstance(image, (str, Path)):
+        path = Path(image)
+        if path.exists():
+            logger.debug("encoding file: %s", path)
+            return base64.b64encode(path.read_bytes()).decode()
+        return str(image)
+    if isinstance(image, bytes):
+        return base64.b64encode(image).decode()
+    raise TypeError(f"unsupported image type: {type(image)}")
+
+
+def save_images(
+    images: list[bytes],
+    output_dir: str = ".",
+    prefix: str = "output",
+) -> list[Path]:
+    """Write raw PNG bytes to numbered files. Returns saved paths."""
+    out = Path(output_dir)
+    out.mkdir(parents=True, exist_ok=True)
+    paths = []
+    for i, data in enumerate(images):
+        path = out / f"{prefix}_{i:04d}.png"
+        path.write_bytes(data)
+        logger.info("saved: %s", path)
+        paths.append(path)
+    return paths
diff --git a/tensors/server/__init__.py b/tensors/server/__init__.py
new file mode 100644
index 0000000..d539965
--- /dev/null
+++ b/tensors/server/__init__.py
@@ -0,0 +1,31 @@
+"""sd-server wrapper — FastAPI app for managing sd-server process."""
+
+from __future__ import annotations
+
+from contextlib import asynccontextmanager
+from typing import TYPE_CHECKING
+
+from fastapi import FastAPI
+
+from tensors.server.process import ProcessManager
+from tensors.server.routes import create_router
+
+if TYPE_CHECKING:
+    from collections.abc import AsyncIterator
+
+__all__ = ["ProcessManager", "create_app"]
+
+
+def create_app() -> FastAPI:
+    """Build the FastAPI application with process manager."""
+    pm = ProcessManager()
+
+    @asynccontextmanager
+    async def lifespan(_app: FastAPI) -> AsyncIterator[None]:
+        yield
+        pm.stop()
+
+    app = FastAPI(title="sd-server wrapper", lifespan=lifespan)
+    app.include_router(create_router(pm))
+    app.state.pm = pm
+    return app
diff --git a/tensors/server/models.py b/tensors/server/models.py
new file mode 100644
index 0000000..330bae1
--- /dev/null
+++ b/tensors/server/models.py
@@ -0,0 +1,19 @@
+"""Pydantic request models for the wrapper API."""
+
+from __future__ import annotations
+
+from pydantic import BaseModel
+
+DEFAULT_PORT = 1234
+
+
+class StartRequest(BaseModel):
+    model: str
+    port: int = DEFAULT_PORT
+    args: list[str] = []
+
+
+class RestartRequest(BaseModel):
+    model: str | None = None
+    port: int | None = None
+    args: list[str] | None = None
diff --git a/tensors/server/process.py b/tensors/server/process.py
new file mode 100644
index 0000000..1898616
--- /dev/null
+++ b/tensors/server/process.py
@@ -0,0 +1,60 @@
+"""sd-server process lifecycle management."""
+
+from __future__ import annotations
+
+import logging
+import shutil
+import signal
+import subprocess
+from typing import Any
+
+logger = logging.getLogger(__name__)
+
+SD_SERVER_BIN = shutil.which("sd-server") or "sd-server"
+
+
+class ProcessManager:
+    def __init__(self) -> None:
+        self.proc: subprocess.Popen[bytes] | None = None
+        self.config: dict[str, Any] = {}
+
+    def build_cmd(self, config: dict[str, Any] | None = None) -> list[str]:
+        cfg = config or self.config
+        cmd = [SD_SERVER_BIN, "-m", cfg["model"], "--listen-port", str(cfg["port"])]
+        cmd.extend(cfg.get("args", []))
+        return cmd
+
+    def start(self, config: dict[str, Any]) -> None:
+        if self.proc is not None and self.proc.poll() is None:
+            raise RuntimeError("Server already running — stop it first")
+        self.config = config
+        cmd = self.build_cmd(config)
+        self.proc = subprocess.Popen(cmd)
+        logger.info("started sd-server pid=%d cmd=%s", self.proc.pid, cmd)
+
+    def stop(self) -> bool:
+        if self.proc is None or self.proc.poll() is not None:
+            self.proc = None
+            return False
+        self.proc.send_signal(signal.SIGTERM)
+        try:
+            self.proc.wait(timeout=10)
+        except subprocess.TimeoutExpired:
+            self.proc.kill()
+            self.proc.wait(timeout=5)
+        logger.info("stopped sd-server")
+        self.proc = None
+        return True
+
+    def status(self) -> dict[str, Any]:
+        if self.proc is None:
+            return {"running": False}
+        rc = self.proc.poll()
+        if rc is not None:
+            return {"running": False, "exit_code": rc}
+        return {
+            "running": True,
+            "pid": self.proc.pid,
+            "config": self.config,
+            "cmd": self.build_cmd(),
+        }
diff --git a/tensors/server/routes.py b/tensors/server/routes.py
new file mode 100644
index 0000000..6074929
--- /dev/null
+++ b/tensors/server/routes.py
@@ -0,0 +1,59 @@
+"""FastAPI route handlers for the wrapper API."""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Any
+
+from fastapi import APIRouter, HTTPException
+
+from tensors.server.models import RestartRequest, StartRequest  # noqa: TC001
+
+if TYPE_CHECKING:
+    from tensors.server.process import ProcessManager
+
+
+def create_router(pm: ProcessManager) -> APIRouter:
+    """Build a new router bound to the given ProcessManager."""
+    router = APIRouter()
+
+    @router.get("/status")
+    def status() -> dict[str, Any]:
+        return pm.status()
+
+    @router.post("/start")
+    def start(req: StartRequest) -> dict[str, Any]:
+        if pm.proc is not None and pm.proc.poll() is None:
+            raise HTTPException(409, "Server already running — use /restart or /stop first")
+        config = {"model": req.model, "port": req.port, "args": req.args}
+        pm.start(config)
+        assert pm.proc is not None
+        return {"started": True, "pid": pm.proc.pid, "cmd": pm.build_cmd(config)}
+
+    @router.post("/stop")
+    def stop() -> dict[str, Any]:
+        if not pm.stop():
+            raise HTTPException(409, "Server is not running")
+        return {"stopped": True}
+
+    @router.post("/restart")
+    def restart(req: RestartRequest) -> dict[str, Any]:
+        if not pm.config and req.model is None:
+            raise HTTPException(400, "No previous config — provide at least 'model'")
+        config = dict(pm.config)
+        if req.model is not None:
+            config["model"] = req.model
+        if req.port is not None:
+            config["port"] = req.port
+        if req.args is not None:
+            config["args"] = req.args
+        was_running = pm.stop()
+        pm.start(config)
+        assert pm.proc is not None
+        return {
+            "restarted": True,
+            "was_running": was_running,
+            "pid": pm.proc.pid,
+            "cmd": pm.build_cmd(config),
+        }
+
+    return router
diff --git a/tests/conftest.py b/tests/conftest.py
index df83dc4..6cfc14e 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -2,10 +2,25 @@
 
 from __future__ import annotations
 
+import base64
 import json
 import struct
 
 import pytest
+import respx
+
+from tensors.generate import SDClient
+
+BASE_URL = "http://127.0.0.1:1234"
+
+# 1x1 red PNG for image response stubs
+TINY_PNG = (
+    b"\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\x01"
+    b"\x00\x00\x00\x01\x08\x02\x00\x00\x00\x90wS\xde\x00"
+    b"\x00\x00\x0cIDATx\x9cc\xf8\x0f\x00\x00\x01\x01\x00"
+    b"\x05\x18\xd8N\x00\x00\x00\x00IEND\xaeB`\x82"
+)
+TINY_PNG_B64 = base64.b64encode(TINY_PNG).decode()
 
 
 @pytest.fixture
@@ -28,3 +43,18 @@ def temp_safetensor(tmp_path):
         f.write(header_bytes)
 
     return file_path
+
+
+@pytest.fixture()
+def mock_api():
+    """Activate respx mock for the sd-server base URL."""
+    with respx.mock(base_url=BASE_URL, assert_all_called=False) as rsps:
+        yield rsps
+
+
+@pytest.fixture()
+def client(mock_api: respx.MockRouter) -> SDClient:  # noqa: ARG001
+    """SDClient wired to the mocked transport."""
+    c = SDClient()
+    yield c  # type: ignore[misc]
+    c.close()
diff --git a/tests/test_generate.py b/tests/test_generate.py
new file mode 100644
index 0000000..fdfe63d
--- /dev/null
+++ b/tests/test_generate.py
@@ -0,0 +1,303 @@
+"""Tests for tensors.generate package."""
+
+from __future__ import annotations
+
+import base64
+import json
+from pathlib import Path
+
+import httpx
+import pytest
+import respx
+
+from tensors.generate import SDClient
+from tensors.generate._http import HttpTransport
+from tensors.generate.params import Img2ImgParams, Txt2ImgParams
+from tensors.generate.util import save_images, to_b64
+from tests.conftest import BASE_URL, TINY_PNG, TINY_PNG_B64
+
+# ── util ──────────────────────────────────────────────────────────────
+
+
+class TestToB64:
+    def test_bytes_input(self):
+        raw = b"hello"
+        assert to_b64(raw) == base64.b64encode(raw).decode()
+
+    def test_file_path(self, tmp_path: Path):
+        f = tmp_path / "img.png"
+        f.write_bytes(b"\x89PNG")
+        result = to_b64(str(f))
+        assert base64.b64decode(result) == b"\x89PNG"
+
+    def test_pathlib_path(self, tmp_path: Path):
+        f = tmp_path / "img.png"
+        f.write_bytes(b"data")
+        result = to_b64(f)
+        assert base64.b64decode(result) == b"data"
+
+    def test_passthrough_string(self):
+        b64 = base64.b64encode(b"already").decode()
+        assert to_b64(b64) == b64
+
+    def test_unsupported_type(self):
+        with pytest.raises(TypeError, match="unsupported image type"):
+            to_b64(12345)  # type: ignore[arg-type]
+
+
+class TestSaveImages:
+    def test_saves_files(self, tmp_path: Path):
+        images = [b"img0", b"img1", b"img2"]
+        paths = save_images(images, str(tmp_path), prefix="test")
+        assert len(paths) == 3
+        for i, p in enumerate(paths):
+            assert p.name == f"test_{i:04d}.png"
+            assert p.read_bytes() == images[i]
+
+    def test_creates_directory(self, tmp_path: Path):
+        out = tmp_path / "sub" / "dir"
+        save_images([b"x"], str(out))
+        assert (out / "output_0000.png").exists()
+
+
+# ── params ────────────────────────────────────────────────────────────
+
+
+class TestTxt2ImgParams:
+    def test_minimal_body(self):
+        p = Txt2ImgParams(prompt="a cat")
+        body = p.to_body()
+        assert body["prompt"] == "a cat"
+        assert body["width"] == 512
+        assert body["height"] == 512
+        assert body["steps"] == 20
+        assert body["seed"] == -1
+        assert "sampler_name" not in body
+        assert "scheduler" not in body
+        assert "clip_skip" not in body
+        assert "lora" not in body
+
+    def test_optional_fields_included(self):
+        p = Txt2ImgParams(
+            prompt="test",
+            sampler_name="euler_a",
+            scheduler="karras",
+            clip_skip=2,
+            lora=[{"path": "x.safetensors", "multiplier": 0.5}],
+        )
+        body = p.to_body()
+        assert body["sampler_name"] == "euler_a"
+        assert body["scheduler"] == "karras"
+        assert body["clip_skip"] == 2
+        assert len(body["lora"]) == 1
+
+
+class TestImg2ImgParams:
+    def test_minimal_body(self, tmp_path: Path):
+        img = tmp_path / "init.png"
+        img.write_bytes(b"\x89PNG")
+        p = Img2ImgParams(prompt="paint it", init_image=str(img))
+        body = p.to_body()
+        assert body["prompt"] == "paint it"
+        assert body["denoising_strength"] == 0.75
+        decoded = base64.b64decode(body["init_images"][0])
+        assert decoded == b"\x89PNG"
+        assert "width" not in body
+        assert "height" not in body
+        assert "mask" not in body
+
+    def test_all_optional_fields(self, tmp_path: Path):
+        img = tmp_path / "init.png"
+        img.write_bytes(b"img")
+        mask = tmp_path / "mask.png"
+        mask.write_bytes(b"mask")
+        extra = tmp_path / "extra.png"
+        extra.write_bytes(b"extra")
+
+        p = Img2ImgParams(
+            prompt="test",
+            init_image=str(img),
+            mask=str(mask),
+            width=768,
+            height=768,
+            inpainting_mask_invert=True,
+            sampler_name="euler",
+            scheduler="simple",
+            clip_skip=1,
+            lora=[{"path": "a.gguf", "multiplier": 1.0}],
+            extra_images=[str(extra)],
+        )
+        body = p.to_body()
+        assert body["width"] == 768
+        assert body["mask"]
+        assert body["inpainting_mask_invert"] == 1
+        assert body["sampler_name"] == "euler"
+        assert len(body["extra_images"]) == 1
+
+
+# ── _http ─────────────────────────────────────────────────────────────
+
+
+class TestHttpTransport:
+    def test_get_success(self):
+        with respx.mock(base_url=BASE_URL) as rsps:
+            rsps.get("/test").respond(json={"ok": True})
+            t = HttpTransport(BASE_URL)
+            assert t.get("/test") == {"ok": True}
+            t.close()
+
+    def test_post_success(self):
+        with respx.mock(base_url=BASE_URL) as rsps:
+            rsps.post("/gen").respond(json={"images": []})
+            t = HttpTransport(BASE_URL)
+            assert t.post("/gen", {"prompt": "x"}) == {"images": []}
+            t.close()
+
+    def test_get_http_error(self):
+        with respx.mock(base_url=BASE_URL) as rsps:
+            rsps.get("/bad").respond(status_code=404, text="not found")
+            t = HttpTransport(BASE_URL)
+            with pytest.raises(httpx.HTTPStatusError):
+                t.get("/bad")
+            t.close()
+
+    def test_post_http_error(self):
+        with respx.mock(base_url=BASE_URL) as rsps:
+            rsps.post("/bad").respond(status_code=500, text="error")
+            t = HttpTransport(BASE_URL)
+            with pytest.raises(httpx.HTTPStatusError):
+                t.post("/bad", {})
+            t.close()
+
+    def test_get_connection_error(self):
+        with respx.mock(base_url=BASE_URL) as rsps:
+            rsps.get("/fail").mock(side_effect=httpx.ConnectError("refused"))
+            t = HttpTransport(BASE_URL)
+            with pytest.raises(httpx.ConnectError):
+                t.get("/fail")
+            t.close()
+
+
+# ── info ──────────────────────────────────────────────────────────────
+
+
+class TestInfoAPI:
+    def test_models(self, mock_api: respx.MockRouter, client: SDClient):
+        mock_api.get("/v1/models").respond(json={"data": [{"id": "sd-cpp-local", "object": "model", "owned_by": "local"}]})
+        result = client.info.models()
+        assert len(result) == 1
+        assert result[0]["id"] == "sd-cpp-local"
+
+    def test_sd_models(self, mock_api: respx.MockRouter, client: SDClient):
+        mock_api.get("/sdapi/v1/sd-models").respond(
+            json=[{"title": "sdxl", "model_name": "sdxl", "filename": "sdxl.safetensors"}]
+        )
+        result = client.info.sd_models()
+        assert result[0]["title"] == "sdxl"
+
+    def test_options(self, mock_api: respx.MockRouter, client: SDClient):
+        mock_api.get("/sdapi/v1/options").respond(
+            json={
+                "samples_format": "png",
+                "sd_model_checkpoint": "v1-5",
+            }
+        )
+        result = client.info.options()
+        assert result["sd_model_checkpoint"] == "v1-5"
+
+    def test_loras(self, mock_api: respx.MockRouter, client: SDClient):
+        mock_api.get("/sdapi/v1/loras").respond(
+            json=[
+                {"name": "style", "path": "style.safetensors"},
+            ]
+        )
+        result = client.info.loras()
+        assert len(result) == 1
+        assert result[0]["name"] == "style"
+
+    def test_samplers(self, mock_api: respx.MockRouter, client: SDClient):
+        mock_api.get("/sdapi/v1/samplers").respond(
+            json=[
+                {"name": "euler", "aliases": ["euler"], "options": {}},
+                {"name": "euler_a", "aliases": ["euler_a"], "options": {}},
+            ]
+        )
+        result = client.info.samplers()
+        assert result == ["euler", "euler_a"]
+
+    def test_schedulers(self, mock_api: respx.MockRouter, client: SDClient):
+        mock_api.get("/sdapi/v1/schedulers").respond(
+            json=[
+                {"name": "discrete", "label": "discrete"},
+                {"name": "karras", "label": "karras"},
+            ]
+        )
+        result = client.info.schedulers()
+        assert result == ["discrete", "karras"]
+
+
+# ── generation ────────────────────────────────────────────────────────
+
+
+class TestTxt2Img:
+    def test_returns_decoded_images(self, mock_api: respx.MockRouter, client: SDClient):
+        mock_api.post("/sdapi/v1/txt2img").respond(
+            json={
+                "images": [TINY_PNG_B64],
+                "parameters": {},
+                "info": "",
+            }
+        )
+        images = client.generate.txt2img(Txt2ImgParams(prompt="a cat"))
+        assert len(images) == 1
+        assert images[0] == TINY_PNG
+
+    def test_multiple_images(self, mock_api: respx.MockRouter, client: SDClient):
+        mock_api.post("/sdapi/v1/txt2img").respond(
+            json={
+                "images": [TINY_PNG_B64, TINY_PNG_B64, TINY_PNG_B64],
+                "parameters": {},
+                "info": "",
+            }
+        )
+        params = Txt2ImgParams(prompt="cats", batch_size=3)
+        images = client.generate.txt2img(params)
+        assert len(images) == 3
+
+    def test_sends_correct_body(self, mock_api: respx.MockRouter, client: SDClient):
+        route = mock_api.post("/sdapi/v1/txt2img").respond(
+            json={
+                "images": [TINY_PNG_B64],
+                "parameters": {},
+                "info": "",
+            }
+        )
+        params = Txt2ImgParams(
+            prompt="hello",
+            width=768,
+            height=768,
+            steps=30,
+            sampler_name="euler_a",
+        )
+        client.generate.txt2img(params)
+        sent = json.loads(route.calls[0].request.content)
+        assert sent["prompt"] == "hello"
+        assert sent["width"] == 768
+        assert sent["sampler_name"] == "euler_a"
+
+
+class TestImg2Img:
+    def test_returns_decoded_images(self, mock_api: respx.MockRouter, client: SDClient, tmp_path: Path):
+        mock_api.post("/sdapi/v1/img2img").respond(
+            json={
+                "images": [TINY_PNG_B64],
+                "parameters": {},
+                "info": "",
+            }
+        )
+        img = tmp_path / "init.png"
+        img.write_bytes(TINY_PNG)
+        params = Img2ImgParams(prompt="paint", init_image=str(img))
+        images = client.generate.img2img(params)
+        assert len(images) == 1
+        assert images[0] == TINY_PNG
diff --git a/tests/test_server.py b/tests/test_server.py
new file mode 100644
index 0000000..090c649
--- /dev/null
+++ b/tests/test_server.py
@@ -0,0 +1,141 @@
+"""Tests for tensors.server package (FastAPI sd-server manager)."""
+
+from __future__ import annotations
+
+from unittest.mock import MagicMock, patch
+
+import pytest
+from fastapi.testclient import TestClient
+
+from tensors.server import create_app
+from tensors.server.process import ProcessManager
+
+
+@pytest.fixture()
+def pm() -> ProcessManager:
+    return ProcessManager()
+
+
+@pytest.fixture()
+def api() -> TestClient:
+    return TestClient(create_app())
+
+
+def _get_pm(api: TestClient) -> ProcessManager:
+    return api.app.state.pm  # type: ignore[union-attr]
+
+
+class TestStatus:
+    def test_not_running(self, api: TestClient) -> None:
+        r = api.get("/status")
+        assert r.status_code == 200
+        assert r.json()["running"] is False
+
+    def test_running(self, api: TestClient) -> None:
+        pm = _get_pm(api)
+        mock_proc = MagicMock()
+        mock_proc.poll.return_value = None
+        mock_proc.pid = 999
+        pm.proc = mock_proc
+        pm.config = {"model": "/m.safetensors", "port": 1234, "args": []}
+        r = api.get("/status")
+        data = r.json()
+        assert data["running"] is True
+        assert data["pid"] == 999
+
+    def test_exited(self, api: TestClient) -> None:
+        pm = _get_pm(api)
+        mock_proc = MagicMock()
+        mock_proc.poll.return_value = 1
+        pm.proc = mock_proc
+        r = api.get("/status")
+        data = r.json()
+        assert data["running"] is False
+        assert data["exit_code"] == 1
+
+
+class TestStart:
+    @patch("tensors.server.process.subprocess.Popen")
+    def test_start_success(self, mock_popen: MagicMock, api: TestClient) -> None:
+        mock_popen.return_value.pid = 42
+        mock_popen.return_value.poll.return_value = None
+        r = api.post("/start", json={"model": "/m.safetensors"})
+        assert r.status_code == 200
+        assert r.json()["started"] is True
+        assert r.json()["pid"] == 42
+
+    @patch("tensors.server.process.subprocess.Popen")
+    def test_start_already_running(self, mock_popen: MagicMock, api: TestClient) -> None:
+        pm = _get_pm(api)
+        mock_proc = MagicMock()
+        mock_proc.poll.return_value = None
+        pm.proc = mock_proc
+        r = api.post("/start", json={"model": "/m.safetensors"})
+        assert r.status_code == 409
+
+
+class TestStop:
+    def test_stop_not_running(self, api: TestClient) -> None:
+        r = api.post("/stop")
+        assert r.status_code == 409
+
+    def test_stop_running(self, api: TestClient) -> None:
+        pm = _get_pm(api)
+        mock_proc = MagicMock()
+        mock_proc.poll.return_value = None
+        mock_proc.wait.return_value = 0
+        pm.proc = mock_proc
+        r = api.post("/stop")
+        assert r.status_code == 200
+        assert r.json()["stopped"] is True
+        mock_proc.send_signal.assert_called_once()
+
+
+class TestRestart:
+    def test_restart_no_config_no_model(self, api: TestClient) -> None:
+        r = api.post("/restart", json={})
+        assert r.status_code == 400
+
+    @patch("tensors.server.process.subprocess.Popen")
+    def test_restart_with_new_model(self, mock_popen: MagicMock, api: TestClient) -> None:
+        mock_popen.return_value.pid = 100
+        mock_popen.return_value.poll.return_value = None
+        pm = _get_pm(api)
+        pm.config = {"model": "/old.safetensors", "port": 1234, "args": []}
+        r = api.post("/restart", json={"model": "/new.safetensors"})
+        assert r.status_code == 200
+        data = r.json()
+        assert data["restarted"] is True
+        assert "/new.safetensors" in str(data["cmd"])
+
+    @patch("tensors.server.process.subprocess.Popen")
+    def test_restart_keeps_previous_config(self, mock_popen: MagicMock, api: TestClient) -> None:
+        mock_popen.return_value.pid = 101
+        mock_popen.return_value.poll.return_value = None
+        pm = _get_pm(api)
+        pm.config = {"model": "/m.safetensors", "port": 5555, "args": ["--fa"]}
+        r = api.post("/restart", json={})
+        assert r.status_code == 200
+        assert "5555" in str(r.json()["cmd"])
+
+
+class TestProcessManager:
+    def test_status_not_running(self, pm: ProcessManager) -> None:
+        assert pm.status() == {"running": False}
+
+    def test_build_cmd(self, pm: ProcessManager) -> None:
+        config = {"model": "/m.gguf", "port": 1234, "args": ["--fa"]}
+        cmd = pm.build_cmd(config)
+        assert "/m.gguf" in cmd
+        assert "--fa" in cmd
+        assert "1234" in cmd
+
+    @patch("tensors.server.process.subprocess.Popen")
+    def test_start_and_stop(self, mock_popen: MagicMock, pm: ProcessManager) -> None:
+        mock_popen.return_value.pid = 77
+        mock_popen.return_value.poll.return_value = None
+        mock_popen.return_value.wait.return_value = 0
+        pm.start({"model": "/m.gguf", "port": 1234, "args": []})
+        assert pm.proc is not None
+        assert pm.stop() is True
+        assert pm.proc is None
diff --git a/uv.lock b/uv.lock
index f52ed86..e894e29 100644
--- a/uv.lock
+++ b/uv.lock
@@ -2,6 +2,24 @@ version = 1
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+[package.optional-dependencies]
+server = [
+    { name = "fastapi" },
+    { name = "uvicorn" },
+]
+
 [package.dev-dependencies]
 dev = [
+    { name = "fastapi" },
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     { name = "nuitka" },
     { name = "pre-commit" },
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     { name = "respx" },
     { name = "ruff" },
+    { name = "uvicorn" },
 ]
 
 [package.metadata]
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+    { name = "uvicorn", marker = "extra == 'server'", specifier = ">=0.30" },
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     { name = "respx", specifier = ">=0.22.0" },
     { name = "ruff", specifier = ">=0.9.0" },
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