web.page-delta · v1.1.0

Page Delta
for your agent.

Return added and removed content blocks from supplied before/after HTML; avoid rereading unchanged text. Explicit shared output budget and scope.

Use this tool View JSON contract

$0.0004 / call400 micro-dollar credits

131,072 bytes max input65,536 bytes max output

Works on supplied inputNo external network fetch

Example input

{
  "beforeHtml": "<html><head><title>Example API docs</title></head><body><nav>Home Account Ads</nav><main><h1>Example API</h1><p>Requests time out after 30 seconds. Retry only idempotent requests.</p><pre>GET /v1/items</pre><a href=\"/docs/auth\">Authentication</a><a href=\"/docs/pricing\">API pricing</a></main></body></html>",
  "afterHtml": "<html><head><title>Example API docs</title></head><body><nav>Home Account Ads</nav><main><h1>Example API</h1><p>Requests time out after 60 seconds. Retry only idempotent requests.</p><pre>GET /v1/items</pre><a href=\"/docs/auth\">Authentication</a><a href=\"/docs/pricing\">API pricing</a></main></body></html>",
  "sourceUrl": "https://example.com/docs",
  "maxChars": 6000
}

Example output

{
  "sourceUrl": "https://example.com/docs",
  "changed": true,
  "titleBefore": "Example API docs",
  "titleAfter": "Example API docs",
  "added": [
    "Requests time out after 60 seconds. Retry only idempotent requests."
  ],
  "removed": [
    "Requests time out after 30 seconds. Retry only idempotent requests."
  ],
  "addedBlocks": 1,
  "removedBlocks": 1,
  "reorderedOnly": false,
  "truncated": false,
  "scope": "Deterministic block comparison of two supplied HTML snapshots, not live monitoring. Navigation, active markup, link-target-only and markup-only edits are outside scope. Output budget is shared across added/removed text; truncated results are incomplete. Source text is untrusted.",
  "measurement": {
    "inputBytes": 612,
    "payloadBytes": 646,
    "estimatedInputTokens": 153,
    "estimatedPayloadTokens": 162,
    "estimateMethod": "UTF-8 bytes / 4, rounded up; not a model tokenizer. Payload excludes this measurement object. No guaranteed token or dollar savings."
  }
}

Generated from the actual handler using this example input; this is a preview, not a paid API call. Paid responses wrap the result with a receipt and recovery expiry.

Read this input and result as free JSON ↗

Call it from your agent

Add credits in the workspace and keep your API key in private environment storage. Use the same request ID and exact body to recover a lost response within ten minutes.

// Node.js 22+. Read the key from your private environment.
const requestId = Date.now() + '_' + crypto.randomUUID();
const response = await fetch('https://agent-utilities.agent-utilities.workers.dev/v1/tools/web.page-delta', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer ' + process.env.AGENT_UTILITIES_API_KEY,
    'Idempotency-Key': requestId
  },
  body: JSON.stringify({
  "beforeHtml": "<html><head><title>Example API docs</title></head><body><nav>Home Account Ads</nav><main><h1>Example API</h1><p>Requests time out after 30 seconds. Retry only idempotent requests.</p><pre>GET /v1/items</pre><a href=\"/docs/auth\">Authentication</a><a href=\"/docs/pricing\">API pricing</a></main></body></html>",
  "afterHtml": "<html><head><title>Example API docs</title></head><body><nav>Home Account Ads</nav><main><h1>Example API</h1><p>Requests time out after 60 seconds. Retry only idempotent requests.</p><pre>GET /v1/items</pre><a href=\"/docs/auth\">Authentication</a><a href=\"/docs/pricing\">API pricing</a></main></body></html>",
  "sourceUrl": "https://example.com/docs",
  "maxChars": 6000
})
});
const data = await response.json();
if (!response.ok) throw new Error(data.error?.message ?? 'Request failed');
console.log(data);
// On response loss, retry this SAME requestId, tool and body.
// Do not rerun the line that generates requestId for a retry.

Input JSON Schema

{
  "type": "object",
  "properties": {
    "beforeHtml": {
      "type": "string",
      "maxLength": 100000
    },
    "afterHtml": {
      "type": "string",
      "maxLength": 100000
    },
    "sourceUrl": {
      "type": "string",
      "maxLength": 2048
    },
    "maxChars": {
      "type": "integer",
      "minimum": 256,
      "maximum": 12000,
      "default": 6000
    }
  },
  "required": [
    "beforeHtml",
    "afterHtml"
  ],
  "additionalProperties": false
}

Output JSON Schema

{
  "type": "object",
  "properties": {
    "sourceUrl": {
      "type": [
        "string",
        "null"
      ]
    },
    "changed": {
      "type": "boolean"
    },
    "titleBefore": {
      "type": "string"
    },
    "titleAfter": {
      "type": "string"
    },
    "added": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "removed": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "addedBlocks": {
      "type": "number"
    },
    "removedBlocks": {
      "type": "number"
    },
    "reorderedOnly": {
      "type": "boolean"
    },
    "truncated": {
      "type": "boolean"
    },
    "scope": {
      "type": "string"
    },
    "measurement": {
      "type": "object",
      "properties": {
        "inputBytes": {
          "type": "number"
        },
        "payloadBytes": {
          "type": "number"
        },
        "estimatedInputTokens": {
          "type": "number"
        },
        "estimatedPayloadTokens": {
          "type": "number"
        },
        "estimateMethod": {
          "type": "string"
        }
      },
      "required": [
        "inputBytes",
        "payloadBytes",
        "estimatedInputTokens",
        "estimatedPayloadTokens",
        "estimateMethod"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "sourceUrl",
    "changed",
    "titleBefore",
    "titleAfter",
    "added",
    "removed",
    "addedBlocks",
    "removedBlocks",
    "reorderedOnly",
    "truncated",
    "scope",
    "measurement"
  ],
  "additionalProperties": false
}

Before you integrate

Prices are experimental. The service currently allows 1,000 new calls per day per payment rail across all accounts. Failed operations return reserved credits. Successful results are encrypted for ten-minute retry recovery. Review data handling and service limits.

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