Kuro

Record run step

record_run_step

Destructive

Record the current result of an agent-driven workflow run, in score order.

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": {
      "run_id": "<run_id>",
      "step_id": "<step_id>",
      "result": "<result>"
    },
    "name": "record_run_step"
  }
}

Input Schema

Name	Required	Description	Default
`result`	Yes
`run_id`	Yes
`step_id`	Yes

Output Schema

Name	Required	Description	Default
`run`	No
`count`	No
`steps`	No
`credits`	No
`fan_outs`	No
`recovery`	No
`checkpoint`	No
`storyboard`	No
`conditional`	No
`generations`	No
`review_hash`	No
`unit_credits`	No
`analysis_credits`	No
`checkpoint_error`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed4 schema fields changedNov 4, 2026

changedOutput schema / properties / generations / items / additionalProperties
```
Previous value: -{}New value: +false
```
addedOutput schema / properties / generations / items / description
```
Added value: +"One image, clip, voice-over or piece of music."
```

addedOutput schema / properties / generations / items / properties

Added value: +{
+  "app_url": {
+    "description": "Opens it in the app.",
+    "format": "uri",
+    "type": "string"
+  },
+  "aspect_ratio": {
+    "description": "Null for audio.",
+    "type": [
+      "string",
+      "null"
+    ]
+  },
+  "caption_style": {
+    "anyOf": [
+      {
+        "additionalProperties": false,
+        "properties": {
+          "anchor": {
+            "default": "bottom",
+            "enum": [
+              "top",
+              "bottom"
+            ],
+            "type": "string"
+          },
+          "border": {
+            "anyOf": [
+              {
+                "additionalProperties": false,
+                "properties": {
+                  "color": {
+                    "$ref": "#/properties/generations/items/properties/caption_style/anyOf/0/properties/color",
+                    "default": "#000000"
+                  },
+                  "kind": {
+                    "const": "outline",
+                    "type": "string"
+                  },
+                  "scale": {
+                    "default": 0.049,
+                    "maximum": 0.3,
+                    "minimum": 0,
+                    "type": "number"
+                  },
+                  "shadow_scale": {
+                    "default": 0.012,
+                    "maximum": 0.3,
+                    "minimum": 0,
+                    "type": "number"
+                  }
+                },
+                "required": [
+                  "kind"
+                ],
+                "type": "object"
+              },
+              {
+                "additionalProperties": false,
+                "properties": {
+                  "color": {
+                    "$ref": "#/properties/generations/items/properties/caption_style/anyOf/0/properties/color",
+                    "default": "#000000"
+                  },
+                  "kind": {
+                    "const": "plate",
+                    "type": "string"
+                  },
+                  "pad_scale": {
+                    "default": 0.025,
+                    "maximum": 0.3,
+                    "minimum": 0,
+                    "type": "number"
+                  }
+                },
+                "required": [
+                  "kind"
+                ],
+                "type": "object"
+              }
+            ],
+            "default": {
+              "color": "#000000",
+              "kind": "outline",
+              "scale": 0.049,
+              "shadow_scale": 0.012
+            }
+          },
+          "casing": {
+            "default": "upper",
+            "enum": [
+              "none",
+              "upper"
+            ],
+            "type": "string"
+          },
+          "color": {
+            "default": "#FFFFFF",
+            "pattern": "^#[0-9a-fA-F]{6}(?:[0-9a-fA-F]{2})?$",
+            "type": "string"
+          },
+          "font_id": {
+            "default": "noto-sans",
+            "enum": [
+              "inter",
+              "montserrat",
+              "oswald",
+              "archivo-black",
+              "noto-sans",
+              "tiktok-sans"
+            ],
+            "type": "string"
+          },
+          "font_scale": {
+            "default": 0.075,
+            "maximum": 0.2,
+            "minimum": 0.02,
+            "type": "number"
+          },
+          "font_weight": {
+            "default": 700,
+            "maximum": 900,
+            "minimum": 100,
+            "multipleOf": 100,
+            "type": "integer"
+          },
+          "grouping": {
+            "additionalProperties": false,
+            "default": {
+              "gap_seconds": null,
+              "max_chars": null,
+              "max_lines": 2,
+              "max_words": null,
+              "unit": "phrase"
+            },
+            "properties": {
+              "gap_seconds": {
+                "anyOf": [
+                  {
+                    "maximum": 4,
+                    "minimum": 0,
+                    "type": "number"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ],
+                "default": null
+              },
+              "max_chars": {
+                "anyOf": [
+                  {
+                    "maximum": 160,
+                    "minimum": 8,
+                    "type": "integer"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ],
+                "default": null
+              },
+              "max_lines": {
+                "default": 2,
+                "enum": [
+                  1,
+                  2
+                ],
+                "type": "number"
+              },
+              "max_words": {
+                "anyOf": [
+                  {
+                    "maximum": 24,
+                    "minimum": 1,
+                    "type": "integer"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ],
+                "default": null
+              },
+              "unit": {
+                "default": "phrase",
+                "enum": [
+                  "word",
+                  "phrase",
+                  "sentence"
+                ],
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "highlight": {
+            "default": "active_word",
+            "enum": [
+              "none",
+              "active_word",
+              "karaoke"
+            ],
+            "type": "string"
+          },
+          "highlight_color": {
+            "$ref": "#/properties/generations/items/properties/caption_style/anyOf/0/properties/color",
+            "default": "#FFD700"
+          },
+          "italic": {
+            "default": false,
+            "type": "boolean"
+          },
+          "margin_h": {
+            "default": 0.06,
+            "maximum": 0.4,
+            "minimum": 0,
+            "type": "number"
+          },
+          "margin_v": {
+            "anyOf": [
+              {
+                "const": "auto",
+                "type": "string"
+              },
+              {
+                "maximum": 0.45,
+                "minimum": 0,
+                "type": "number"
+              }
+            ],
+            "default": "auto"
+          },
+          "schema_version": {
+            "const": "1.0",
+            "default": "1.0",
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "created_at": {
+    "format": "date-time",
+    "type": "string"
+  },
+  "credits": {
+    "description": "Credits charged. Zero when your own provider key or the free allowance paid.",
+    "type": [
+      "number",
+      "null"
+    ]
+  },
+  "error": {
+    "description": "Why it failed. Null otherwise.",
+    "type": [
+      "string",
+      "null"
+    ]
+  },
+  "id": {
+    "format": "uuid",
+    "type": "string"
+  },
+  "model": {
+    "description": "The model id it was made with (`GET /v1/models`).",
+    "type": "string"
+  },
+  "object": {
+    "const": "generation",
+    "type": "string"
+  },
+  "output_url": {
+    "anyOf": [
+      {
+        "format": "uri",
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "description": "The finished file, once `ready`. A signed link that works for about an hour; read the generation again for a fresh one."
+  },
+  "paid_by": {
+    "description": "Who paid: \"credits\", \"house\" (the free allowance), \"server\" (a server that charges nothing), or the vendor of your own key (\"replicate\", \"fal\", …).",
+    "type": [
+      "string",
+      "null"
+    ]
+  },
+  "prompt": {
+    "type": "string"
+  },
+  "ready_in_seconds": {
+    "description": "Roughly how long an unfinished generation has left; 0 means past its usual time.",
+    "type": [
+      "number",
+      "null"
+    ]
+  },
+  "recipe_id": {
+    "anyOf": [
+      {
+        "$ref": "#/properties/generations/items/properties/id"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "description": "The recipe it was made with, if any."
+  },
+  "refined_from": {
+    "anyOf": [
+      {
+        "format": "uuid",
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  },
+  "stalled": {
+    "type": "boolean"
+  },
+  "status": {
+    "description": "`ready` and `failed` are final.",
+    "enum": [
+      "queued",
+      "generating",
+      "ready",
+      "failed"
+    ],
+    "type": "string"
+  },
+  "thumbnail_url": {
+    "anyOf": [
+      {
+        "$ref": "#/properties/generations/items/properties/output_url/anyOf/0"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "description": "A small still of the result, for a grid. Null for audio and while it works."
+  },
+  "type": {
+    "description": "What was made. New values may be added; treat an unknown one as opaque.",
+    "enum": [
+      "image",
+      "clip",
+      "voiceover",
+      "music",
+      "tool"
+    ],
+    "type": "string"
+  },
+  "vendor_phase": {
+    "anyOf": [
+      {
+        "enum": [
+          "queued",
+          "running"
+        ],
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ]
+  }
+}

addedOutput schema / properties / generations / items / required

Added value: +[
+  "object",
+  "id",
+  "type",
+  "status",
+  "model",
+  "prompt",
+  "aspect_ratio",
+  "output_url",
+  "thumbnail_url",
+  "credits",
+  "paid_by",
+  "error",
+  "ready_in_seconds",
+  "recipe_id",
+  "created_at",
+  "app_url",
+  "refined_from",
+  "caption_style",
+  "vendor_phase",
+  "stalled"
+]

First observedOct 15, 2026

TDQS

C2.6/5.0

Behavior2/5

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

Annotations already declare destructiveHint=true, idempotentHint=false, and readOnlyHint=false, so the safety profile is visible. However, the description does not explain what recording a step destroys or overwrites, whether prior results are replaced, or what authorization or side effects are involved. It adds little behavioral context beyond the annotations.

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?

The description is a single front-loaded sentence with no filler. It is concise, though the trailing phrase 'in score order' is ambiguous rather than informative.

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

Completeness2/5

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

The tool has a complex result union type and destructive annotations, but the description does not explain the result variants, overwrite behavior, or invocation context. Output schema coverage helps with return values, but the input semantics and destructive behavior remain significantly under-described.

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

Parameters1/5

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

Schema description coverage is 0%, and the description does not compensate: it does not explain run_id, step_id, or the seven possible result shapes. 'In score order' is especially unclear and does not clarify how result data should be structured or ordered.

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?

The description gives a specific verb and resource: recording the current result of an agent-driven workflow run. It is clear enough to distinguish from retrieval tools like get_workflow_run, though it does not explicitly differentiate itself from other workflow mutation siblings. The phrase 'in score order' is ambiguous and slightly weakens clarity.

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?

The description implies this is used during an agent-driven workflow run, but it does not state when to use this tool versus alternatives such as decide_workflow_items or the various workflow-run control tools. There are no explicit prerequisites, exclusions, or conditions for invocation.

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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