PicassoWeb

Extract website assets

extract_assets

Use this when you specifically need the original asset files from one page. Avoid it when you are starting a full-page replica; create_replication_kit already downloads assets.

Instructions

Use this when you specifically need the original asset files from one page. Avoid it when you are starting a full-page replica; create_replication_kit already downloads assets. Download original images, SVGs, fonts, videos, favicons, and backgrounds with a usage manifest. Cost: standard. Session: uses one browser page for one URL. May write files when an output path is provided. Possible follow-ups if evidence is still missing: clone_section, create_replication_kit.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`url`	Yes	Absolute http:// or https:// URL to extract assets from.
`types`	No	Asset types to include. Empty means all.
`maxAssets`	No	Maximum unique assets to download.
`outputDir`	Yes	Absolute directory to write an 'assets/' folder and manifest.json into.
`timeoutMs`	No	Navigation timeout in milliseconds.
`userAgent`	No	Optional browser user-agent override.
`waitUntil`	No	Page lifecycle event to await before extraction.	domcontentloaded
`autoScroll`	No	Scroll through the page before extraction to trigger lazy-rendered content.
`maxScrolls`	No	Maximum viewport-sized scroll steps when autoScroll is enabled.
`maxSvgBytes`	No	Skip inline SVGs larger than this.
`viewportWidth`	No	Browser viewport width in CSS pixels.
`viewportHeight`	No	Browser viewport height in CSS pixels.
`maxBytesPerAsset`	No	Skip assets larger than this.
`allowPrivateNetwork`	No	Allow localhost and private-network URLs. Enable only for trusted sites.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`result`	Yes
`guidance`	Yes

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

Changed6 schema fields changedv0.10.1Aug 28, 2026

addedOutput schema / properties / guidance

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "cost": {
+      "enum": [
+        "light",
+        "standard",
+        "heavy"
+      ],
+      "type": "string"
+    },
+    "nextTools": {
+      "description": "Candidate follow-ups; do not call them automatically or in parallel.",
+      "items": {
+        "enum": [
+          "analyze_site",
+          "analyze_html",
+          "inspect_component",
+          "capture_screenshot",
+          "extract_assets",
+          "extract_animations",
+          "extract_layout",
+          "clone_section",
+          "capture_interactions",
+          "extract_responsive",
+          "compare_replica",
+          "create_replication_kit",
+          "capture_motion",
+          "crawl_site"
+        ],
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "sessionPolicy": {
+      "enum": [
+        "offline-document",
+        "single-url",
+        "multi-viewport",
+        "dual-page",
+        "site-crawl"
+      ],
+      "type": "string"
+    },
+    "summary": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "tool": {
+      "const": "extract_assets",
+      "type": "string"
+    },
+    "warnings": {
+      "description": "Non-fatal limitations or incomplete evidence from this run.",
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "writesFiles": {
+      "type": "boolean"
+    }
+  },
+  "required": [
+    "tool",
+    "summary",
+    "nextTools",
+    "warnings",
+    "cost",
+    "writesFiles",
+    "sessionPolicy"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / result / additionalProperties
```
Added value: +{}
```

addedOutput schema / properties / result / properties

Added value: +{
+  "assets": {
+    "items": {
+      "additionalProperties": {},
+      "properties": {},
+      "type": "object"
+    },
+    "type": "array"
+  },
+  "inlineSvgs": {
+    "items": {
+      "additionalProperties": {},
+      "properties": {},
+      "type": "object"
+    },
+    "type": "array"
+  },
+  "metadata": {
+    "additionalProperties": {},
+    "properties": {
+      "analyzedAt": {
+        "type": "string"
+      },
+      "finalUrl": {
+        "type": "string"
+      },
+      "requestedUrl": {
+        "type": "string"
+      },
+      "title": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "requestedUrl",
+      "finalUrl",
+      "title",
+      "analyzedAt"
+    ],
+    "type": "object"
+  },
+  "outputDir": {
+    "type": "string"
+  },
+  "skipped": {
+    "items": {
+      "additionalProperties": {},
+      "properties": {},
+      "type": "object"
+    },
+    "type": "array"
+  },
+  "warnings": {
+    "description": "Non-fatal limitations or incomplete evidence from this run.",
+    "items": {
+      "type": "string"
+    },
+    "type": "array"
+  }
+}

addedOutput schema / properties / result / required

Added value: +[
+  "metadata",
+  "outputDir",
+  "assets",
+  "inlineSvgs",
+  "skipped",
+  "warnings"
+]

addedOutput schema / properties / result / type
```
Added value: +"object"
```

changedOutput schema / required

Previous value: -[
-  "result"
-]New value: +[
+  "result",
+  "guidance"
+]

First observedv0.8.0Aug 3, 2026

TDQS

A4.5/5.0

Behavior4/5

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

It discloses the non-read-only behavior ('May write files when an output path is provided'), resource cost ('standard'), and session scope ('uses one browser page for one URL'), going beyond the annotations. The annotations mark readOnlyHint=false, so there is no contradiction.

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

Conciseness5/5

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

The description is compact and front-loaded: usage guidance, exclusion of the sibling, asset list, cost/session/side effects, and follow-ups each earn their place in a few short sentences. No filler.

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

Completeness5/5

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

Given the 14-parameter schema with full coverage, an output schema, and non-conflicting annotations, the description supplies the remaining selection context: single-page scope, write behavior, cost, session resources, and suggested follow-up tools. An agent has what it needs to select and invoke the tool correctly.

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 100%, so the input schema already documents every parameter including formats, defaults, and outputDir's manifest behavior. The description adds only a general 'original asset files' frame and repeats categories already present in the types enum, neither of which adds much beyond the schema.

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

Purpose5/5

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

The description opens with a specific verb+resource: download original asset files from one page, and explicitly lists the asset categories and a usage manifest. It also names create_replication_kit as the sibling that is not this tool, so an agent can distinguish them.

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

Usage Guidelines5/5

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

It states exactly when to use ('when you specifically need the original asset files from one page') and when to avoid ('when starting a full-page replica'), naming create_replication_kit as the alternative that already downloads assets. It also lists clone_section and create_replication_kit as follow-ups for missing evidence.

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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