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webability

Scan a multi-page user flow

flow_scan
Read-onlyIdempotent

Scan a multi-page user journey. Walks startUrl plus the required autoNavigate URLs sequentially (deterministic — one page fully rendered and scanned before the next), then returns ONE consolidated report with issues deduplicated across pages, each carrying the same fix payload / confidence / review flags as scan_page. Every requested URL gets an explicit outcome in pages[] (scanned / nav_failed / scan_failed / redirected_duplicate / duplicate_request / skipped_cap / blocked — bot-challenge, not a clean page) — a page is never silently dropped. Better than per-page scans for journeys (login → checkout etc). For a single page, use scan_page. NOTE: on this HOSTED server, localhost and private addresses are refused — it runs in our cloud and cannot reach your machine. Two ways to scan a local dev server: run the MCP locally (npx -y @webability/mcp, simplest — nothing leaves the machine), or open a tunnel (webability-tunnel --port 3000) and pass its URL as url together with the printed secret as tunnel_secret.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
wcagNoOnly these WCAG criteria. A prefix selects the whole guideline ("1.4") or principle ("2").
rulesNoOnly these rule ids (WebAbility type such as "missing_alt" or axe rule id such as "image-alt"). See get_rules.
formatNo"compact" prints one line per element with rule metadata once — far fewer tokens than the default JSON. Default json.
contextYesExplain in 15-25 words, in third person, why this tool is called and how it supports the user's goal. For analytics only. You MUST describe only the abstract purpose of the tool call. NEVER include, repeat, paraphrase, or infer personal, sensitive, or identifying information from the user request or tool results, including names, emails, phone numbers, IPs, IDs, or credentials. You MUST generalize specific entities into roles such as "a user", "the customer", or "an account". Example: "Retrieving a customer's recent orders to investigate a billing issue and help support determine the appropriate resolution."
maxPagesNoMax pages to scan (default 10)
startUrlYesStarting URL of the journey
llm_modelYesThe exact model identifier you (the assistant) are running as, taken from your system prompt or environment (e.g. "claude-opus-4-8", "gpt-5.2"). Used for analytics only. If you do not know your model identifier with certainty, pass "unknown" — never guess.
minImpactNoOnly findings at this severity or above (critical > serious > moderate > minor)
sourceRootNoLocal project root (local installs only) for `sourceCandidates[]` on issues without a framework `source` pointer.
autoNavigateYesREQUIRED — the URLs to walk after startUrl (the MCP server is headless and cannot discover a journey interactively). For a single page, use scan_page instead.
tunnel_secretNoSecret printed by `webability-tunnel`. Required when `url` is a tunnel URL; the URL alone will be refused by the relay. Ignored otherwise.
conversation_idNoEcho the conversation_id from the server's previous response. The server provides it on the first call — never invent one, and do not issue parallel tool calls until you have it.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.6/5.0
Behavior5/5

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

Annotations only cover the read-only/idempotent/open-world profile; the description adds far more: deterministic sequential rendering, a single deduplicated report, per-URL outcome enumeration (scanned/nav_failed/scan_failed/redirected_duplicate/duplicate_request/skipped_cap/blocked) with the guarantee that no page is silently dropped, and the hosted-server localhost refusal plus tunnel workflow. This is rich 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?

Dense but front-loaded: the core purpose and routing come first, then the localhost/tunnel caveat. The tunnel aside is long, but each sentence carries operational information rather than 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?

For a 12-parameter tool with no output schema, the description compensates by describing the consolidated report shape and the pages[] outcome vocabulary, so an agent knows both what it gets back and how partial failures surface. Nothing critical is missing.

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 baseline is 3. The description reinforces why autoNavigate is required (headless server cannot discover journeys) and how tunnel_secret pairs with a tunnel URL, but most parameter meaning already lives in 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?

States a specific verb+resource ("Scan a multi-page user journey") and immediately scopes it against the closest sibling by naming scan_page for single-page work. An agent can distinguish it from scan_page and diff_scan without opening a schema.

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?

Gives explicit when-to-use ("Better than per-page scans for journeys (login → checkout etc)"), the alternative ("For a single page, use scan_page"), and a host-specific exclusion with two concrete workarounds for localhost. Routing guidance is unusually complete.

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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