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SignalHarness Markdown Outline Extractor
x402
SignalHarness Markdown Outline Extractor is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Parses markdown or plain text and extracts a structured outline of headings, titles, and section hierarchy up to a configurable depth.
Price / call$0.005
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing the document title, an array of heading objects (with text, level, and optionally section line ranges), a total heading count, and any parsing warnings encountered. All results are wrapped in a standard SignalHarness receipt envelope with execution metadata, payment confirmation, and a SHA-256 result hash.
Example use cases
README navigation structure extraction
“I have a large README.md file — can you pull out all the headings up to level 2 so I can build a quick navigation summary from it?”
Technical doc table of contents
“Extract the full heading hierarchy from this technical specification document, up to heading depth 4, and include section ranges so I know which lines each section covers.”
Article structure review
“Can you parse this markdown blog post and give me its outline — just the title and top-level headings — so I can see how the content is structured before I edit it?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/markdown_outline_extract/invokeWhen to prefer
Choose this endpoint when you need a lightweight, structured extraction of heading hierarchy from markdown or plain text documents — especially when you need heading counts, section ranges, or depth-limited outlines for navigation, summarization, or document analysis pipelines. It is well-suited for agent workflows that process documentation, README files, or long-form articles and need structured section metadata without full document parsing.
Side effects
- Empty or whitespace-only input returns a result with zero headings and possible warnings
- Text exceeding 65,536 characters is rejected with a validation error
- Invalid maximumHeadingDepth values outside 1–6 are rejected
- Malformed markdown may produce incomplete heading lists with warnings in the warnings array
- Payment failure or insufficient USDC balance results in a 402 error before execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | |
| markdown | string | |
| maximumHeadingDepth | integer | |
| includeSectionRanges | boolean |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"title": "example",
"headings": [
{
"end": 0,
"text": "Example caller-supplied content.",
"level": 1,
"start": 0,
"anchor": "example",
"ordinal": 0,
"sectionEnd": 0,
"sectionStart": 0,
"parentOrdinal": -1
}
],
"warnings": [
"Verify the caller-supplied data before relying on this result."
],
"headingCount": 0
},
"status": "succeeded",
"receipt": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"usage": [],
"status": "succeeded",
"network": "eip155:8453",
"artifacts": [],
"endedAtMs": 0,
"latencyMs": 0,
"paymentId": "example-payment",
"receiptId": "example-receipt",
"requestId": "example-request",
"serviceId": "markdown_outline_extract",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "5000",
"resultSha256": "b190eb5a7af63f7c83c3ac8ba3eff252ceebe13556fe09aae25d112fc8ba8219",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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