@runapi.ai/flux-2-mcp

Official

by runapi-ai

Overview Schema Source Related Servers Discussions Admin

TypeScript

Remote

text_to_image

Generate Flux 2 images from a text prompt on RunAPI; get a task ID, status, and output URLs.

Instructions

Create a Flux 2 task on RunAPI (text to image). Returns a task id, status, and output URLs.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "prompt": "<prompt>"
    },
    "name": "text_to_image"
  }
}

Input Schema

Name	Required	Description
`wait`	No	Poll until the task reaches a terminal status.
`model`	No	RunAPI model slug for this model line.
`prompt`	Yes	Image description. Declared type: string.
`timeout_ms`	No
`aspect_ratio`	No	Output aspect ratio. Declared type: string. Known values: "1:1", "4:3", "3:4", "16:9", "9:16", "3:2", "2:3".
`callback_url`	No	Webhook URL for async notifications. Declared type: string.
`output_count`	No	Number of images to generate. Declared type: integer. Known values: 1.
`poll_interval_ms`	No
`output_resolution`	No	Output resolution. Declared type: string. Known values: "1k", "2k".
`enable_safety_checker`	No	Enable the safety checker. Declared type: boolean.

Schema Changelog

Changes observed during successful MCP inspections.

Changed16 schema fields changedv0.3.0Oct 7, 2026

changedInput schema / additionalProperties
```
Previous value: -falseNew value: +{}
```

changedInput schema / properties / aspect_ratio / description

Previous value: -"Output aspect ratio."New value: +"Output aspect ratio. Declared type: string. Known values: \"1:1\", \"4:3\", \"3:4\", \"16:9\", \"9:16\", \"3:2\", \"2:3\"."

removedInput schema / properties / aspect_ratio / enum

Removed value: -[
-  "1:1",
-  "4:3",
-  "3:4",
-  "16:9",
-  "9:16",
-  "3:2",
-  "2:3"
-]

changedInput schema / properties / callback_url / description

Previous value: -"Webhook URL for async notifications."New value: +"Webhook URL for async notifications. Declared type: string."

changedInput schema / properties / enable_safety_checker / description

Previous value: -"Enable the safety checker."New value: +"Enable the safety checker. Declared type: boolean."

removedInput schema / properties / model / enum

Removed value: -[
-  "flux-2-flex-text-to-image",
-  "flux-2-max-text-to-image",
-  "flux-2-pro-text-to-image"
-]

changedInput schema / properties / output_count / description

Previous value: -"Number of images to generate."New value: +"Number of images to generate. Declared type: integer. Known values: 1."

removedInput schema / properties / output_count / enum
```
Removed value: -[
-  1
-]
```
changedInput schema / properties / output_count / type
```
Previous value: -"number"New value: +"integer"
```

changedInput schema / properties / output_resolution / description

Previous value: -"Output resolution."New value: +"Output resolution. Declared type: string. Known values: \"1k\", \"2k\"."

removedInput schema / properties / output_resolution / enum
```
Removed value: -[
-  "1k",
-  "2k"
-]
```
addedInput schema / properties / poll_interval_ms / maximum
```
Added value: +9007199254740991
```

changedInput schema / properties / prompt / description

Previous value: -"Image description."New value: +"Image description. Declared type: string."

removedInput schema / properties / prompt / maxLength
```
Removed value: -5000
```
removedInput schema / properties / prompt / minLength
```
Removed value: -3
```
addedInput schema / properties / timeout_ms / maximum
```
Added value: +9007199254740991
```

Changed11 schema fields changedv0.2.1Jul 31, 2026

addedInput schema / properties / aspect_ratio / description
```
Added value: +"Output aspect ratio."
```

addedInput schema / properties / callback_url

Added value: +{
+  "description": "Webhook URL for async notifications.",
+  "type": "string"
+}

addedInput schema / properties / enable_safety_checker

Added value: +{
+  "description": "Enable the safety checker.",
+  "type": "boolean"
+}

changedInput schema / properties / model / enum

Previous value: -[
-  "flux-2-flex-text-to-image",
-  "flux-2-pro-text-to-image"
-]New value: +[
+  "flux-2-flex-text-to-image",
+  "flux-2-max-text-to-image",
+  "flux-2-pro-text-to-image"
+]

addedInput schema / properties / output_count

Added value: +{
+  "description": "Number of images to generate.",
+  "enum": [
+    1
+  ],
+  "type": "number"
+}

addedInput schema / properties / output_resolution / description
```
Added value: +"Output resolution."
```
addedInput schema / properties / prompt / description
```
Added value: +"Image description."
```
addedInput schema / properties / prompt / maxLength
```
Added value: +5000
```
addedInput schema / properties / prompt / minLength
```
Added value: +3
```
addedInput schema / properties / prompt / type
```
Added value: +"string"
```
addedInput schema / required
```
Added value: +[
+  "prompt"
+]
```

First observedv0.1.0Jun 23, 2026

TDQS

B3.2/5.0

Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden, and it does disclose the async task model by stating it returns a task id, status, and output URLs. However, it omits key behavior: that the default `wait: true` blocks and polls, timeout/poll-interval semantics, callback usage, and any auth or rate-limit constraints.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two tight sentences with the action front-loaded and zero filler. It is efficiently sized, though the second sentence could carry more operational detail without bloat.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

There is no output schema, and the description partially compensates by naming the return fields (task id, status, output URLs). However, for a 10-parameter async generation tool with no annotations, it leaves the polling/waiting workflow, callback behavior, and timeout handling unexplained.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 80%, so the schema already documents most parameters, establishing a baseline of 3. The description adds no per-parameter meaning (e.g., when to set `wait` vs `callback_url`, or timeout behavior), so it does not exceed that baseline.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ("Create a Flux 2 task") and clarifies the modality with "(text to image)", which distinguishes it from remix_image and get_task. It does not explicitly contrast itself with those siblings, so it falls short of a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this versus remix_image or when to poll with get_task, and no mention of the prerequisites (API credentials, model slug). The only implicit signal is the returned task id, which an agent must infer to pair with get_task.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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