---
id: daily-flux-kontext
name: "flux-kontext"
url: https://skills.yangsir.net/skill/daily-flux-kontext
author: agentspace-so
domain: multimedia
tags: ["image-generation", "image-editing", "image-to-image", "generative-ai"]
install_count: 122100
rating: 4.80 (5 reviews)
github: https://github.com/agentspace-so/runcomfy-agent-skills
---

# flux-kontext

> Flux Kontext 专业图像编辑模型，高质量图像到图像转换和编辑

**Stats**: 122,100 installs · 4.8/5 (5 reviews)

## Before / After 对比

### 专业图像编辑效率

**Before**:

使用 Photoshop 手动进行图像风格迁移和细节编辑，需要精确选区、图层处理和效果调优，一张复杂图像编辑需要 1-2 小时

**After**:

上传参考图像和编辑指令自动生成目标效果，智能处理光影和细节保持，复杂图像编辑 2 分钟完成，支持批量处理和风格一致性

| Metric | Before | After | Change |
|---|---|---|---|
| 编辑时间 | 90分钟 | 2分钟 | -98% |

## Readme

# flux-kontext

# Flux Kontext Pro — Pro Pack on RunComfy

[runcomfy.com](https://www.runcomfy.com/?utm_source=skills.sh&utm_medium=skill&utm_campaign=flux-kontext) · [Model page](https://www.runcomfy.com/models/blackforestlabs/flux-1-kontext-pro/image-to-image?utm_source=skills.sh&utm_medium=skill&utm_campaign=flux-kontext) · [GitHub](https://github.com/agentspace-so/runcomfy-skills/tree/main/flux-kontext)

Black Forest Labs' **Flux 1 Kontext Pro** — single-reference precise local image edit — hosted on the **RunComfy Model API**. Strong prompt control, consistent outputs, high fidelity.

```
npx skills add agentspace-so/runcomfy-skills --skill flux-kontext -g

```

## When to pick this model (vs siblings)

You want
Use

Single-image precise local edit ("she's now holding X")
**Flux Kontext**

High-fidelity preservation of source identity
**Flux Kontext**

Batch edits across 1–20 images
Nano Banana Edit

Edit multilingual / embedded text in image
GPT Image 2 edit

Generate from scratch, no source image
Flux 2 Klein

If the user said "Flux Kontext" / "kontext" / "BFL Kontext" explicitly, route here regardless.

## Prerequisites

- **RunComfy CLI** — `npm i -g @runcomfy/cli`

- **RunComfy account** — `runcomfy login` opens a browser device-code flow.

- **CI / containers** — set `RUNCOMFY_TOKEN=<token>` instead of `runcomfy login`.

## Endpoints + input schema

### `blackforestlabs/flux-1-kontext/pro/edit`

Field
Type
Required
Default
Notes

`prompt`
string
yes
—
Single declarative edit instruction.

`image`
string
yes
—
Single source image URL (publicly fetchable HTTPS).

`aspect_ratio`
enum
no
(input)
Pick from supported W:H options on the model page.

`seed`
int
no
—
Reuse for variant comparisons.

The schema is intentionally minimal — Kontext leans on prompt + single ref. For multi-image or web-grounded edits, route to Nano Banana Edit.

## How to invoke

**Default — local edit, preserve everything else:**

```
runcomfy run blackforestlabs/flux-1-kontext/pro/edit \
  --input '{
    "prompt": "Keep the person'\''s face, pose, and clothing unchanged. Add an orange umbrella in her left hand and a slight smile.",
    "image": "https://.../portrait.jpg"
  }' \
  --output-dir <absolute/path>

```

**With seed for reproducible variant series:**

```
runcomfy run blackforestlabs/flux-1-kontext/pro/edit \
  --input '{
    "prompt": "Keep the bottle, label, and lighting unchanged. Replace the brand text on the label from \"ALPHA\" to \"AURA\".",
    "image": "https://.../bottle.jpg",
    "seed": 42
  }' \
  --output-dir <absolute/path>

```

## Prompting — what actually works

**One declarative instruction.** Kontext shines on prompts shaped like the docs example: `"She is now holding an orange umbrella and smiling"`. Imperative mood, single change.

**Preservation first.** Lead with `"Keep [identity / pose / framing / brand] unchanged."` Then the change. Models honor what's stated up front.

**Single ref only — pick the right one.** No multi-image fanout here. If you have multiple references, decide which is primary and pass that one. For multi-image flows, route to Nano Banana Edit.

**Iterate on small changes.** If Kontext drifts, split a compound edit into sequential single-instruction passes (pass 1: change background, pass 2: change clothing).

**Aspect ratio — pick from the supported enum.** Out-of-list values 422 or crop.

**Anti-patterns:**

- Compound prompts ("change A and add B and remove C") → drift.

- Trying to fan out to multiple source images → wrong model (use Nano Banana Edit).

- Prompts written in passive voice → less reliable.

- Asking for novel composition without a source image → wrong model (use Flux 2 Klein t2i).

## Where it shines

Use case
Why Flux Kontext

**Single-shot precise local edit**
Specifically designed for this; high fidelity

**Preserve source identity through targeted change**
Strong preservation under explicit instruction

**Brand-asset text or color swap**
Quoted text + preservation lead-in works well

**Quick iteration on one image**
Short prompts + single ref = fast result loop

## Sample prompts (verified to produce strong results)

**Page example:**

```
She is now holding an orange umbrella and smiling

```

**Preservation-led brand edit:**

```
Keep the bottle silhouette, table, and lighting exactly as in the input.
Replace only the brand text on the label, from "ALPHA" to "AURA".
Same font weight, white on black, centered.

```

**Compositional micro-edit:**

```
Keep the person's face, pose, and clothing unchanged. Add a leather
shoulder bag, dark brown, hanging on the right shoulder.

```

## Limitations

- **Single source image only.** For multi-image flows, use Nano Banana Edit (1–20).

- **Public RunComfy docs are minimal** — schema fields beyond prompt + image + aspect_ratio + seed may exist; check the [model page](https://www.runcomfy.com/models/blackforestlabs/flux-1-kontext-pro/image-to-image?utm_source=skills.sh&utm_medium=skill&utm_campaign=flux-kontext) for the latest field list.

- **Compound prompts drift** — split into sequential passes.

- **For multilingual / embedded text editing, GPT Image 2 edit usually wins.**

## Exit codes

code
meaning

0
success

64
bad CLI args

65
bad input JSON / schema mismatch

69
upstream 5xx

75
retryable: timeout / 429

77
not signed in or token rejected

Full reference: [docs.runcomfy.com/cli/troubleshooting](https://docs.runcomfy.com/cli/troubleshooting?utm_source=skills.sh&utm_medium=skill&utm_campaign=flux-kontext).

## How it works

The skill invokes `runcomfy run blackforestlabs/flux-1-kontext/pro/edit` with a JSON body matching the schema. The CLI POSTs to `https://model-api.runcomfy.net/v1/models/blackforestlabs/flux-1-kontext/pro/edit`, polls the request, fetches the result, and downloads any `.runcomfy.net`/`.runcomfy.com` URL into `--output-dir`. `Ctrl-C` cancels the remote request before exit.

## Security & Privacy

- **Token storage**: `runcomfy login` writes the API token to `~/.config/runcomfy/token.json` with mode 0600 (owner-only read/write). Set `RUNCOMFY_TOKEN` env var to bypass the file entirely in CI / containers.

- **Input boundary**: the user prompt is passed as a JSON string to the CLI via `--input`. The CLI does NOT shell-expand the prompt; it transmits the JSON body directly to the Model API over HTTPS. No shell injection surface from prompt content.

- **Third-party content**: image / mask / video URLs you pass are fetched by the RunComfy model server, not by the CLI on your machine. Treat external URLs as untrusted; image-based prompt injection is a known risk for any image-edit / video-edit model.

- **Outbound endpoints**: only `model-api.runcomfy.net` (request submission) and `*.runcomfy.net` / `*.runcomfy.com` (download whitelist for generated outputs). No telemetry, no callbacks.

- **Generated-file size cap**: the CLI aborts any single download > 2 GiB to prevent disk-fill from a malicious or runaway model output.

Weekly Installs10.5KRepository[agentspace-so/r…t-skills](https://github.com/agentspace-so/runcomfy-agent-skills)First SeenTodaySecurity Audits[Gen Agent Trust HubPass](/agentspace-so/runcomfy-agent-skills/flux-kontext/security/agent-trust-hub)[SocketPass](/agentspace-so/runcomfy-agent-skills/flux-kontext/security/socket)[SnykWarn](/agentspace-so/runcomfy-agent-skills/flux-kontext/security/snyk)

---
*Source: https://skills.yangsir.net/skill/daily-flux-kontext*
*Markdown mirror: https://skills.yangsir.net/api/skill/daily-flux-kontext/markdown*