Task402 Agent Evidence Tools

npx add-mcp 'https://task402.xyz/mcp'

Task402 Agent Evidence Tools

Give agents bounded evidence from PDFs, public webpages, OpenAPI contracts, and Base chain data. Connect to the hosted 20-tool MCP service at https://task402.xyz/mcp; no local server, API key, or wallet is needed for discovery. Paid calls use x402 v2 USDC on Base. Connecting an MCP host does not automatically give it a payment signer.

Connect your agent

For Cursor, merge examples/cursor.mcp.json into .cursor/mcp.json. For VS Code, merge examples/vscode.mcp.json into .vscode/mcp.json. Other Streamable HTTP clients can use:

{
  "mcpServers": {
    "task402": { "url": "https://task402.xyz/mcp" }
  }
}

Initialize the connection and run tools/list to inspect executable schemas. With Node.js 24 and this repository's dependencies installed, npm run discover performs discovery through the official MCP SDK and prints tool names only. It never calls a paid tool or signs a payment.

Every hosted tool advertises a tool-specific output schema, parameter descriptions, and MCP safety annotations. Agents can therefore plan the result shape and retry behavior from tools/list before approving any x402 payment.

Tools	Billing at the 12 October 2026 live check
generate_pdf	$0.01 per PDF
web_evidence	$0.005 per public HTTPS page
inspect_openapi	$0.001 per specification
plan_api_request, diff_openapi	$0.002 per call
get_chain_balance, get_chain_transaction, get_erc20_balance	$0.001 per read
get_pdf_job	Included with generation; requires the job capability
inspect_pdf, get_document_map, search_document, batch_search_document, prepare_document_context, extract_document_fields, read_document, verify_document_citation, compare_pdfs, validate_pdf_text, render_pdf_page_region	Included after paid PDF indexing; requires document capabilities

PDF indexing is the separate REST operation POST /v1/documents ($0.01 per PDF); binary upload is not an MCP tool. Generated PDF download is also REST-only. Read /v1/pricing and the payment challenge for current terms before approving payment. Native-text PDF tools do not provide OCR or verify factual truth.

Start with docs/FIRST-PAID-CALL.md for a challenge, signed retry, and result workflow. Use docs/PUBLISHING.md to publish the repository and remote MCP metadata.

Service architecture

This project converts Markdown into paginated PDF files through one shared service used by REST and MCP. The local runner uses Playwright Chromium and SQLite; the Cloudflare Worker adapter uses Browser Run Quick Actions, D1, and R2. The live payment path uses the official x402 SDK facilitator client, verifies before rendering, and settles only after a PDF artifact is stored.

The paid operations are generate_pdf, ingest_document, web_evidence, OpenAPI inspection/planning/diffing, and fixed-method Base chain reads. Retrieval, citation, batch search, bounded context preparation, and explicit-label field matching are included after indexing. Web evidence is public HTTPS HTML/text only, OpenAPI tools accept caller-supplied JSON and local references only, and chain tools never sign or submit transactions. Input HTML is not executed, remote images and other external resources are omitted or blocked, and hyperlinks are preserved in generated PDFs but never fetched during rendering.

Distribution metadata, conversion guidance, and channel-ready copy live in docs/MARKETING.md and docs/LAUNCH-KIT.md; the public MCP directory metadata is in server.json, glama.json, and lhm.plugin.json for LobeHub.

The detailed agent, discovery, operations, deployment, operator-stats, and security guide is docs/AGENT-GUIDE.md.

Use the hosted MCP server

No local process is required. Add the Streamable HTTP endpoint to an MCP-compatible client:

{
  "mcpServers": {
    "task402": {
      "type": "http",
      "url": "https://task402.xyz/mcp"
    }
  }
}

The server is discoverable without payment. Paid operations return an x402 v2 challenge; the client must inspect the network, USDC asset, recipient, amount, resource, and timeout, obtain explicit wallet approval, then retry the same request with the signed payment. Task402 never receives a private key and never signs or submits transactions for the caller. Start with the first paid call, then use examples/agent-flow.ts for a complete injected-signer flow.

What is included

Capability	Payment	Interface
Generate a paginated PDF from Markdown	$0.01	REST, MCP
Index one native-text PDF	$0.01	REST
Search, cite, compare, validate, map, read, extract fields, prepare context, and render	Included after indexing	REST, MCP
Bounded public-page evidence	$0.005	REST, MCP
OpenAPI inspect, request plan, and diff	$0.001–$0.002	REST, MCP
Read-only Base balance, transaction, and ERC-20 data	$0.001	REST, MCP

Prices, limits, schemas, and payment terms are machine-readable at /v1/pricing. The service does not provide OCR, JavaScript page rendering, arbitrary API execution, transaction signing, or visual/legal PDF redlining.

The remote MCP server metadata is version 0.3.2 in server.json. In the 2026-10-12 audit, the official Registry served 0.2.0; publishing the new metadata requires the domain publisher proof key, which is intentionally not stored in this workspace. Recheck the live Registry record before claiming the release is published. Paid REST and MCP challenges include x402 Bazaar discovery metadata, and the production facilitator is https://facilitator.openx402.ai.

Public discovery pages are available at https://task402.xyz/, /docs#first-paid-call, /llms.txt, /demo, /v1/tools, /openapi.json, /v1/pricing, /.well-known/x402.json, /.well-known/mcp/server-card.json, /.well-known/ai-plugin.json, and /sitemap.xml. They give agents and directory crawlers a clear entry point without requiring payment or an operator credential. Registry publication improves discoverability for clients that sync the MCP Registry; it does not create synthetic traffic or guarantee calls.

The public quickstart includes focused workflows for citation verification, PDF revision comparison, and reducing PDF context before model calls. Copy-paste client files are in examples/agent-flow.ts, examples/cursor.mcp.json, and examples/vscode.mcp.json. The TypeScript example obtains unsigned generation and indexing challenges and exposes explicit retry methods for a separately approved wallet payload; it never signs or submits a payment automatically.

When you are ready for one controlled live payment, follow docs/TEST-TRANSACTION.md. It requires an external wallet signer and never asks for a private key.

For a disposable local test wallet, the repository also includes a guarded terminal helper: npm run test:live. It validates the live Base/USDC challenge before signing, requires TASK402_CONFIRM=YES, downloads the PDF, and never prints the payment payload or capability. See the terminal section of the test guide for setup and cleanup.

To reproduce an MCP agent exactly, use npm run test:agent; it performs discovery, receives the structured x402 challenge, signs through the official EVM client, retries with _meta["x402/payment"], checks the job through get_pdf_job, and downloads the result.

Local development

Use Node.js 24 or newer (verified with Node 24.13; local durable state uses node:sqlite). From this directory:

npm ci
Copy-Item .dev.vars.example .dev.vars
npm run setup:browser
npm run dev

The local server binds only to 127.0.0.1:8787 and accepts only the matching loopback/localhost Host authority (plus the configured public authority in live mode). The local web-evidence adapter resolves every hostname before fetching and rejects private, loopback, link-local, and reserved DNS destinations; the hosted Worker relies on its platform egress boundary plus the same URL checks. The example .dev.vars enables an explicit no-payment development bypass, and the bypass exists only in src/local.ts; src/worker.ts rejects it unconditionally. If .dev.vars is absent, the server starts with payments unconfigured and paid generation fails closed. Local jobs and artifacts are durable under .data/ and are ignored by Git.

If Playwright cannot find its pinned Chromium download on your machine, point it to an installed Chromium executable before starting the local process:

$env:BROWSER_EXECUTABLE_PATH = "C:\path\to\chrome.exe"
npm run dev

Generate and download a sample PDF:

$body = @{ title = "Quarterly Report"; markdown = "# Summary`n`n| Metric | Value |`n| --- | ---: |`n| Revenue | 42 |" } | ConvertTo-Json
$job = Invoke-RestMethod -Method Post -Uri http://127.0.0.1:8787/v1/pdf `
  -Headers @{ "Idempotency-Key" = "report-2026-q3-0001" } `
  -ContentType "application/json" -Body $body
$job | Format-List
Invoke-WebRequest -Uri $job.downloadUrl `
  -Headers @{ Authorization = "Bearer $($job.capability)" } `
  -OutFile .\report.pdf

The capability is a bearer secret. Keep it in memory, do not log it, and send it only to the returned status/download URLs. Status and download access require Authorization: Bearer <capability> (or X-Job-Capability); a job ID or idempotency key alone does not authorize access.

API and limits

Route	Purpose
GET /v1/pricing	Machine-readable operation, price, payment mode, and size/TTL limits
GET /.well-known/x402	Same discovery document at a well-known path
GET / and GET /docs	Public service overview and agent quickstart
GET /llms.txt and GET /sitemap.xml	Compact agent-readable metadata and crawler discovery
POST /v1/pdf	Generate a PDF; requires Idempotency-Key; live mode uses x402 v2 PAYMENT-SIGNATURE
GET /v1/jobs/{jobId}	Read authorized job state
GET /v1/jobs/{jobId}/download	Download an authorized completed PDF
GET /v1/admin/stats	Password-protected aggregate tool statistics; optional ?hours=24
GET /admin	Mobile-friendly password form for viewing the protected stats endpoint
POST /mcp	MCP Streamable HTTP endpoint with PDF, web, OpenAPI, and Base read-only tools
POST /v1/documents	Paid raw PDF indexing for deterministic native-text operations
GET /v1/documents/{documentId} and /map	Inspect document metadata or read its page map
POST /v1/documents/{documentId}/search, /batch-search, /context, /fields, /read, /citation, /validate	Search, build cited context, read selected pages, verify a text quote, or validate stated expectations
POST /v1/documents/compare	Compare two separately authorized PDFs by page and normalized native text
GET /v1/documents/{documentId}/pages/{page}/render	Render a bounded page crop to PNG
POST /v1/web/evidence	Paid public HTTPS page extraction with bounded text, links, source hash, and prompt-injection warning
POST /v1/openapi/inspect	Paid OpenAPI operation, parameter, request-body, security, and local-reference inspection
POST /v1/openapi/request-plan and /v1/openapi/diff	Paid safe request planning and deterministic API contract comparison; no requests are executed
POST /v1/chain/balance, /v1/chain/transaction, /v1/chain/erc20-balance	Paid read-only Base RPC utilities; no signing or fund movement

The default limits are a 256 KiB request body, 240 KiB normalized Markdown, 160 title characters, 20,000 Markdown lines, 20 MiB PDF output, a 24-hour artifact lifetime, and a 90-second render deadline. The PDF uses A4 layout, repeats table headers, keeps rows together when possible, and includes page numbers. Cleanup runs once an hour in Cloudflare, and on startup and hourly in the local process. Cleanup batches are bounded; expired capabilities stop working immediately, while physical deletion can take additional batches. Uncertain settlements retain their artifacts for operator reconciliation.

Local PDF inspection and retrieval

The deployed Worker exposes the deterministic PDF document operations through an isolated Cloudflare Container parser. The Worker keeps capabilities, D1 metadata, R2 source/index objects, validation, and cleanup; the Container performs native PDF.js extraction and bounded page rendering with outbound Internet disabled. Local development continues to use the same operations directly through the Node.js parser.

Upload a raw PDF with a caller-generated idempotency key and separate high-entropy recovery secret (the recovery secret scopes that key to the caller). Save the returned capability and recovery secret in the caller's secret store; the server never returns the recovery secret. Reuse both keys only to recover the same upload after a lost response. The idempotency key alone cannot disclose an existing document capability.

$recovery = [Convert]::ToHexString([Security.Cryptography.RandomNumberGenerator]::GetBytes(32)).ToLowerInvariant()
$doc = Invoke-RestMethod -Method Post -Uri http://127.0.0.1:8787/v1/documents `
  -Headers @{ "Idempotency-Key" = "research-pdf-2026-0001"; "X-Document-Recovery-Key" = $recovery; "X-File-Name" = "research.pdf" } `
  -ContentType "application/pdf" -InFile .\research.pdf
$headers = @{ Authorization = "Bearer $($doc.capability)" }
Invoke-RestMethod -Uri $doc.inspectUrl -Headers $headers
Invoke-RestMethod -Method Post -Uri "$($doc.inspectUrl)/search" -Headers $headers `
  -ContentType "application/json" -Body '{"query":"revenue","limit":5}'
Invoke-RestMethod -Method Post -Uri "$($doc.inspectUrl)/read" -Headers $headers `
  -ContentType "application/json" -Body '{"pages":[1,2]}'

The returned capability is a bearer secret. Keep it private and send it only in the Authorization header to the returned URLs. Binary upload accepts at most 20 MiB and 100 pages. Parsing builds a bounded local index containing metadata, page labels and sizes, bookmarks, native text blocks with normalized bounding boxes, form-field names/types/values, annotation counts, and embedded-attachment filenames/sizes. The index is limited to 8 MiB and 50,000 text blocks. GET .../map?page=1 includes up to 500 positioned blocks for that page; the default map returns compact page summaries. Source PDF bytes and the extracted index are stored durably in .data/document-objects/ and .data/documents.sqlite and removed at expiry; the default retention is 24 hours (DOCUMENT_TTL_SECONDS can extend it to at most seven days).

The MCP endpoint adds inspect_pdf, get_document_map, search_document, batch_search_document, prepare_document_context, extract_document_fields, read_document, verify_document_citation, compare_pdfs, validate_pdf_text, and render_pdf_page_region when the deployed parser Container is configured. MCP does not upload binary content; first use the REST upload and then pass its document ID and capability to the tools.

Search is case-insensitive exact matching after whitespace normalization. Reading is capped at 10 pages and 32,000 output characters. Citation checks establish only that normalized text appears on the stated page and return nearby text blocks and their bounding boxes; they do not establish truth or visual reading order. Comparison reports page-level normalized-text changes and does not inspect image, visual, metadata, or signature differences. Validation checks parser readability, optional page count, and required text only. Page crops use normalized page fractions and are limited to four million raster pixels and 4 MiB of PNG output.

No OCR, table-structure extraction/query, form filling, attachment download, PDF/A conformance test, or cryptographic signature validation is provided. Sparse native text is reported as a warning; scanned pages do not receive invented text. PDF links are retained as text and never fetched. A PDF signature marker is surfaced as metadata only; trust and validity are not checked.

Native PDF parsing and rendering run in the isolated parser Container. The Worker admits one parser task at a time, enforces a 60-second startup/processing deadline, and destroys the Container after each task to reset process and filesystem state. Concurrent uploads or renders receive 503 and should retry shortly with the same recovery/idempotency keys. Upload, page, text, index, output, and instance memory limits also apply; the Container has no outbound Internet access and receives no payment or capability secrets. OCR, visual semantic comparison, PDF/A conformance, and cryptographic signature verification remain unsupported and are reported explicitly by the validation tool.

The idempotency key is scoped to the verified payer in live mode and bound to the normalized input and payment payload. Reusing it with different content or payment returns 409; a duplicate exact payment authorization is rejected using the EVM network/asset/payer/authorization nonce. Payment replay tombstones are retained for at least 30 days after both the artifact expiry and authorization expiry. The same completed request can recover its original capability during the job lifetime without another render or settlement.

REST clients receive x402 v2 terms in a 402 response and a standard PAYMENT-REQUIRED header. MCP clients receive the same PaymentRequired object as an isError: true tool result, and send payment through params._meta["x402/payment"]; a settled tool result includes _meta["x402/payment-response"].

MCP client with a protected wallet

examples/mcp-client.ts demonstrates the official MCP SDK Streamable HTTP client and the x402 MCP transport fields. It takes an ApprovedWallet adapter from the caller and has no private-key field, environment key, or signing implementation. Implement that adapter with a hardware wallet, HSM, KMS, or a separately sandboxed wallet service; have the signer enforce the expected network, USDC asset, recipient, amount ceiling, and nonce policy before it signs. Do not add a long-lived private key to the MCP client or repository.

The example performs an unpaid call to obtain the challenge, asks the injected signer for a payload, retries with _meta["x402/payment"], then returns the job capability for an authenticated download. This is a minimal happy-path example: a production client should persist the idempotency key and exact signed payment payload securely so it can retry the same request, and should retain recovery details returned after an uncertain settlement. The local development bypass does not create or settle chain payments; use a properly configured test wallet and testnet facilitator for an end-to-end x402 transfer.

Cloudflare deployment

The Worker entry point is src/worker.ts. The checked-in wrangler.toml contains the production D1, R2, Browser Run, and parser Durable Object/Container bindings. When deploying to a different account, replace those resource identifiers and provision corresponding resources. Building the parser image requires a running Docker engine and a Docker CLI on PATH. Provision resources using your Cloudflare account:

npx wrangler login
npx wrangler d1 create x402-docs-mvp
npx wrangler r2 bucket create x402-docs-mvp

Copy the D1 database_id printed by Wrangler into wrangler.toml, then apply the checked-in schema:

npx wrangler d1 migrations apply x402-docs-mvp --remote

The stats endpoint uses the tool_stats_daily table from migration 0002_tool_stats.sql. Install its password as a Worker secret before serving traffic:

npx wrangler secret put STATS_PASSWORD
npx wrangler secret put DOCUMENT_CONTAINER_TOKEN

Enable Browser Run for the account and keep the [browser] binding in wrangler.toml. This project calls the documented BROWSER.quickAction("pdf", ...) API. Browser Run is available to Workers Paid accounts, but the Paid plan does not guarantee a hard five-dollar maximum: Browser Run, D1, R2, and Worker usage can incur metered charges. Review Cloudflare's current billing/pricing and configure account budgets/alerts before deploying.

For Worker-side preview, Browser Run Quick Actions require npx wrangler dev --remote (local wrangler dev does not implement quickAction). The regular npm run dev command remains fully local and uses Playwright Chromium instead.

Set non-secret Worker variables in the dashboard or Wrangler variables:

PAYMENTS_MODE=live
PUBLIC_BASE_URL=https://task402.xyz
PRICE_USD=0.01
PRICE_DOCUMENT_USD=0.01
PRICE_WEB_EVIDENCE_USD=0.005
PRICE_OPENAPI_USD=0.001
PRICE_CHAIN_USD=0.001
X402_NETWORK=eip155:8453
X402_ASSET=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
X402_PAY_TO=0xAEA6fDF13ca10aD6B906884ffAcBb58a0e9E144A
X402_FACILITATOR_URL=https://facilitator.openx402.ai
MCP_ALLOWED_ORIGINS=https://<your-approved-mcp-client-origin>

STATS_PASSWORD is required in Worker deployments and must contain 20–256 characters. Use a unique high-entropy random secret. It is not a payment credential and should be kept separate from wallet and facilitator secrets. DOCUMENT_CONTAINER_TOKEN is a separate internal secret used only between the Worker and parser Container. The protected operator route is GET /v1/admin/stats; for phone access, open the mobile page at /admin. See docs/AGENT-GUIDE.md.

The deployed configuration uses Base mainnet USDC (eip155:8453) and https://facilitator.openx402.ai. Its public supported-capabilities response advertises Base mainnet exact EVM payments and the discovery extension, which enables Bazaar cataloging when clients echo the payment extension. Treat the facilitator as a payment dependency: review its availability, terms, supported network, discovery behavior, and settlement behavior before changing production traffic. The service converts PRICE_USD to six-decimal USDC units.

Install the capability HMAC secret and, if required by your facilitator, its bearer token as Worker secrets. Generate a random secret of at least 32 characters and do not commit or paste it into the TOML file:

npx wrangler secret put CAPABILITY_SECRET
npx wrangler secret put X402_FACILITATOR_BEARER_TOKEN

The facilitator token is optional for a facilitator that does not require authentication. Run the local checks, then inspect a deployment bundle before choosing to deploy:

npm ci
npm run typecheck
npm test
npm run deploy:dry-run
# npx wrangler deploy   # explicit operator action after reviewing account config and costs

No wallet credentials or facilitator secrets are included in this repository. The checked-in Wrangler configuration contains the deployment resource identifiers needed by this project; replace them when deploying to another account. The Worker requires live payment configuration and fails closed if it is missing; it has no development bypass. Set the Worker PUBLIC_BASE_URL to the exact trusted HTTPS origin, without a path, credentials, query, or fragment, so MCP results contain absolute status/download URLs without trusting a caller-controlled Host header. The facilitator URL may contain a path but must use HTTPS without URL credentials, query, or fragment.

Settlement recovery

If settlement times out or the facilitator returns a pending/ambiguous result, the job becomes settlement_unknown. The response includes the job ID and capability so its status remains observable. The service retains the rendered PDF and will not automatically retry settlement with the same authorization. Check the facilitator's transaction status and the target network before taking an operator action. Do not resubmit the same authorization: a timeout may mean the chain transaction was accepted even when the response was lost. This MVP does not include a reconciliation/admin endpoint; an operator must reconcile against the facilitator/network and record the outcome through an audited operational process.

Checks

npm test covers input limits, HTML/script/URL sanitization, payment idempotency and replay handling, uncertain and definitive facilitator outcomes, real PDF parsing, capability-gated document recovery, map/search/read/citation/compare/validation, bounded crop rendering, expiry cleanup, and official MCP SDK initialize/list/tool calls. PDF generation and visual pagination were also exercised with local Chromium against short and long-table/long-token fixtures. These tests do not submit a real blockchain payment or validate account-specific Cloudflare bindings.

Distribution readiness

The checked-in directory metadata is in server.json, glama.json, and lhm.plugin.json; the discovery evidence and publication checklist is in docs/DISTRIBUTION-AUDIT.md. Before claiming directory availability, verify the live MCP Registry record, facilitator Bazaar resource, and any third-party listing URL against the current /v1/pricing contract. These files prepare the submission; external directories still require their own publisher or repository workflow.

Agents should prefer /v1/pricing for current prices, /openapi.json for REST schemas, and MCP tools/list for executable input schemas. The public /docs, /llms.txt, and /sitemap.xml pages are intentionally credential-free so crawlers can understand the service before any payment.