on-page-audit

name	on-page-audit
description	Use when: kullanıcı "on-page audit", "meta tag denetimi", "title meta h1 kontrolü", "hedef sorgu sayfada var mı", "title eksik", "h1 eksik", "GSC ile sayfa içi kontrol" der ya da /pseo-on-page-audit çağırır. Also use when: aktif projenin master.xlsx'i mevcut; URL listesi config'te veya gsc_performance / crawl_sitemap sheet'inden geliyor; budget pre-flight PASS; cross-sheet invariant D-03 (URL canonicalization) sağlanmış olmalı; GSC verisi varsa cross-ref devreye girer (target_query her URL için top performans sorgusudur). Do not use when: tek-URL tech audit (tech-audit), keyword volume çekme (dfs-pull), GSC delta hesaplama (gsc-pull), content decay 90d analiz (content-decay) — ayrı skill'ler. Master.xlsx yokken çağırma; init-project önce çalışmalı (DURUR #8). Budget aşılmışsa fallback YASAK (DURUR #1).
version	1.0
status	active
category	discovery
inputs	{"project_slug":{"type":"string","required":true,"description":"Slug; resolves projects/{slug}/master.xlsx + project.config.json."},"urls":{"type":"array","required":true,"description":"URL listesi (string array). DFS on_page_content_parsing bu URL'ler üstünde çalışır."},"use_gsc_cross_ref":{"type":"boolean","required":false,"default":true,"description":"true ise mcp__gsc__search_analytics ile target_query/clicks/impressions çekilir; false → no-cross-ref mode."},"strict_cross_ref":{"type":"boolean","required":false,"default":false,"description":"true ise DFS/GSC URL set'leri D-03 sonrası disjoint olduğunda CrossRefMismatchError (DURUR #4); false → graceful fall-back."},"use_sf_mcp_live":{"type":"boolean","required":false,"default":false,"description":"Opt-in (D-SF-11): when true, calls SF MCP via scripts/util/sf_mcp_client.SfMcpClient for live page_titles_all cross-check (title/meta/h1 freshness vs SF crawl truth). Resolves the crawl id from sf_list_crawls (domain match → instanceDirName), client.load_crawl(...) (resilient), then exports page_titles_all + meta_description_all + h1_all via SF_EXPORT_DISPATCH (sf_export_seo_element_urls), merged per-URL by Address, to file_path (the >100KB inline cap is resolved by writing to disk, not a non-existent 'truncated' flag; live-verified the Page Titles export has only Title columns, so meta/h1 presence must come from their own exports). Each seo-element export is NDJSON → converted via sf_crawl_orchestrator.ndjson_to_csv → csv.DictReader → transform(live_findings=...) (additive crawl-truth merge for SF-only URLs). Requires SF GUI + MCP server running (preflight via client.health(); on FAIL / no matching crawl / SfMcpToolError / load timeout → AMBER fallback to file-based path, NEVER hard fail per R9)."}}
outputs	["master.xlsx#on_page_audit","outputs/reports/{date}-on-page-audit.md","events.jsonl","inbox/dfs/{date}-content_parsing-onpage-{slug}.json","inbox/gsc/{date}-search_analytics-onpage-{slug}.json"]
consumes	["init-project:projects/{slug}/master.xlsx","gsc-pull:master.xlsx#gsc_performance"]
produces	["drift-check","monthly-report"]
triggers	{"manual":["/pseo-on-page-audit"],"natural_language":"\"on-page audit\", \"meta tag denetimi\", \"title meta h1 kontrolü\",\n\"hedef sorgu sayfada var mı\", \"title eksik\", \"h1 eksik\",\n\"GSC ile sayfa içi kontrol\"\n","hooks":[]}
mcp_tools	{"required":["mcp__dataforseo__on_page_content_parsing"],"optional":["mcp__gsc__search_analytics","mcp__sf__sf_list_crawls","mcp__sf__sf_load_crawl","mcp__sf__sf_export_seo_element_urls"]}
budget	{"uses_paid_mcp":true,"estimated_credits":3}
autonomy	{"confidence":"MEDIUM","requires_approval":true,"safe_auto_execute":false}

on-page-audit — discovery skill (Phase 7 Wave 1, paid-MCP)

10-step protocol. Steps map 1:1 to workflow_runner invocations + the spec §16.5 8-step MCP discipline + §16.8 budget pre-flight. Raw JSON drift recovery is mandatory: every DFS / GSC response is dropped into inbox/dfs/ or inbox/gsc/ before any transform runs, so a transform bug never costs us the upstream payload (which is paid for DFS; re-fetch costs credits).

This skill follows the convention authority of skills/discovery/quick-wins/SKILL.md (10-step shape, raw inbox, D-03 URL invariant, DURUR + flag rule, provenance event format) and the paid-MCP authority of skills/ingestion/dfs-pull/SKILL.md (budget pre-flight at Step 1, cost.credits provenance fields). Deviate only with an ADR.

Cross-source semantics: DFS supplies the on-page evidence (title / meta_description / h1[]); GSC supplies the target_query per URL (top performing query by clicks desc, impressions tie-break). Both URL fields are normalized through the D-03 helper before the join — see schemas/cross-sheet-invariants.json#D-03.

Inputs (frontmatter contract)

Name	Type	Default	Notes
project_slug	string	—	Required. Resolves projects/{slug}/master.xlsx.
urls	array	—	Required. URL list driving the paid content_parsing call.
use_gsc_cross_ref	boolean	true	Cross-ref against gsc_performance via search_analytics.
strict_cross_ref	boolean	false	DURUR #4 behaviour on URL-set disjoint after D-03.

workspace_root is resolved via PSEO_WORKSPACE_ROOT env or explicit test override (mirrors workflow_runner / events_writer).

Outputs (artifacts produced)

• projects/{slug}/master.xlsx#on_page_audit — per-URL audit rows (8 cols, schema-locked: url, target_query, impressions_30d, clicks_30d, in_title, in_meta, in_h1, action).
• projects/{slug}/outputs/reports/{date}-on-page-audit.md — human-readable summary (top missing-slot URLs, action histogram).
• projects/{slug}/_state/events.jsonl — event_kind=provenance entries with cost.credits for every DFS call (source.kind=dataforseo_mcp) and a separate entry for the GSC cross-ref (source.kind=gsc_mcp, cost omitted — free).
• projects/{slug}/inbox/dfs/{date}-content_parsing-onpage-{slug}.json — raw DFS payload (drift recovery, paid).
• projects/{slug}/inbox/gsc/{date}-search_analytics-onpage-{slug}.json — raw GSC payload (drift recovery, free) when cross-ref enabled.

10-Step Body Protocol

Each step name must match the steps[*].name passed to workflow_runner.create_run. Names are stable identifiers across runs.

Step 1 — preflight_budget (§16.8, MANDATORY for paid MCP)

estimate = url_count × 3   # CREDITS_PER_URL_CONTENT_PARSING

Run scripts.budget.check_budget against the project's 24h running total. Exit code 0 → proceed. Exit code 1 → DURUR #1 (BudgetExceededError); skill exits awaiting_approval and never silently downgrades.

from scripts.discovery import on_page_audit_transform as opa
from scripts.state import workflow_runner
handle = workflow_runner.create_run(
    skill="on-page-audit",
    project_slug=project_slug,
    steps=[
        {"name": "preflight_budget"},
        {"name": "fetch_content_parsing"},
        {"name": "fetch_gsc_cross_ref"},
        {"name": "transform"},
        {"name": "request_approval"},
        {"name": "write_excel"},
        {"name": "render_report"},
    ],
)
workflow_runner.start_step(handle.run_id, 0, project_slug=project_slug)
estimate = opa.estimate_credits(len(urls))
envelope = opa.preflight_budget(
    estimated_credits=estimate,
    project_config_path=project_root / "project.config.json",
    events_path=project_root / "_state" / "events.jsonl",
)
workflow_runner.finish_step(handle.run_id, 0, project_slug=project_slug,
                            output_ref=str(envelope))

Step 2 — fetch_content_parsing (MCP §16.5 step 3 — raw inbox FIRST)

raw_cp = mcp__dataforseo__on_page_content_parsing(
    urls=urls,    # list[str]
)
inbox_path = (
    workspace_root / "projects" / project_slug
    / "inbox" / "dfs"
    / f"{today.isoformat()}-content_parsing-onpage-{project_slug}.json"
)
inbox_path.parent.mkdir(parents=True, exist_ok=True)
inbox_path.write_text(json.dumps(raw_cp, ensure_ascii=False, indent=2))

Step 3 — fetch_gsc_cross_ref (optional, free, dimensions=['page','query'])

When use_gsc_cross_ref=true:

raw_gsc = mcp__gsc__search_analytics(
    siteUrl=project_config["gsc"]["site_url"],
    startDate=(today - 30).isoformat(),
    endDate=today.isoformat(),
    dimensions=["page", "query"],
)
gsc_inbox = (
    workspace_root / "projects" / project_slug
    / "inbox" / "gsc"
    / f"{today.isoformat()}-search_analytics-onpage-{project_slug}.json"
)
gsc_inbox.parent.mkdir(parents=True, exist_ok=True)  # DURUR #3 path-creation parity with Step 2
gsc_inbox.write_text(json.dumps(raw_gsc, ensure_ascii=False, indent=2))

GSC failure is non-fatal: graceful degrade to no-cross-ref mode — target_query="", impressions_30d=0, clicks_30d=0, action set to "no GSC available for this URL" (DURUR #9 documents this design choice).

Step 4 — transform

Pure compute via scripts/discovery/on_page_audit_transform.py:

python3 scripts/discovery/on_page_audit_transform.py \
    --raw-content-parsing inbox/dfs/{date}-content_parsing-onpage-{slug}.json \
    --raw-gsc             inbox/gsc/{date}-search_analytics-onpage-{slug}.json \
    --locale              {project.config.language.content_locale} \
    --brand-token         {brand}    # repeatable; from project.config brand/domain \
    --output-dir          _state/transform/{run_id}/

Produces a single JSON array (on_page_audit) shaped to the master-excel schema. URL canonicalization (D-03) is applied here on BOTH the DFS URL and the GSC URL before the join, not at fetch time, so the raw inbox copies are byte-faithful to the upstream payloads. The transform is idempotent: same inputs → byte-identical output. Output sorted by impressions_30d desc (stable url asc tie-break).

Keyword presence matching (I5). Presence (in_title / in_meta / in_h1) is token-based — ALL query tokens must be present (in any order), NOT a raw substring (so "cat" is not falsely matched inside "category", and a reordered phrase still matches). Matching is locale-aware: for tr* locales the fold maps İ→i and I→ı BEFORE casefold so the Turkish dotted/dotless-I does not desync the match (e.g. query "iletişim" matches a title "İletişim"). --locale is resolved from project.config.json language.content_locale.

Action heuristic:

Condition	action
target_query empty (no GSC for URL)	"no GSC data — investigate target intent"
brand-dominated query (brand token match)	"brand query — monitor (no meta rewrite)"
in_title + in_meta + in_h1, clicks_30d > 0	"monitor"
in_title only	"add to meta + H1"
missing all three	"rewrite meta cluster"
mixed (some present, some missing)	"patch missing slots"
cross-ref attempted but URL unmatched	"no GSC available for this URL"

Brand-query exclusion (I5). A brand-dominated target_query (matched against the --brand-token list derived from project.config brand/domain) never triggers a "rewrite meta cluster" action — chasing a brand term in the meta is pointless (the page already owns its brand). Such rows are surfaced as "brand query — monitor (no meta rewrite)" and counted in meta.skipped_brand. The engine stays project-agnostic: no brand literals are baked into the transform.

Step 5 — request_approval (skill EXIT awaiting_approval)

workflow_runner.request_approval(
    handle.run_id, project_slug=project_slug,
    approver="user",
    subject=f"{len(rows)} URL on-page audit hesaplandı, master.xlsx#on_page_audit'a yazalım mı?",
    step_index=4,
)
# Skill exits here. The user replies in a fresh session; resume below.

Step 6 — Resume (approve → continue)

workflow_runner.approve(handle.run_id, project_slug=project_slug,
                        approver="user")

Step 7 — write_excel (atomic, schema-validated)

Single committer.commit call for the on_page_audit sheet (8 cols) — the orchestrator's idempotent commit path (whole-block transaction.replace from the schema's data_start_row, so re-running never duplicates rows on the on_page_audit snapshot sheet). Goes through the single approved write path (backup, lock, schema validation, post-write provenance event emission).

from scripts.orchestration import committer
committer.commit(
    workspace_root/"projects"/project_slug/"master.xlsx",
    "on_page_audit",
    on_page_audit_rows,
    run_id=handle.run_id,
    project_slug=project_slug,
    writer="on-page-audit",
)

Step 8 — render_report

render_template.py templates/reports/on-page-audit.template.md data.json → outputs/reports/{date}-on-page-audit.md. Variables (all 19 the template references — render hard-fails on any missing): $project_slug, $date, $run_id, $url_count, $credits_used, $rows_on_page_audit, $action_monitor, $action_add_meta_h1, $action_rewrite, $action_patch, $action_no_gsc, $top_url, $top_target_query, $top_action, $top_clicks, $top_impressions, $raw_dfs_path, $raw_gsc_path, $report_summary.

Step 9 — Provenance event

One event per upstream call. The DFS event carries cost.credits; the GSC event omits cost.

from scripts.state import events_writer
# run_id=None auto-allocates race-free; reuse the returned id so the optional
# GSC cross-ref event below is grouped under the same on-page-audit run.
op_run = events_writer.append_provenance(
    project_id=project_slug,
    source={"kind": "dataforseo_mcp", "mcp_server": "dataforseo",
            "mcp_tool": "dataforseo__on_page_content_parsing",
            "response_bytes": len(json.dumps(raw_cp))},
    operation="project_excel",
    target_excel_sheet="on_page_audit",
    rows_written=len(on_page_audit_rows),
    cost={"provider": "dataforseo",
          "credits": float(estimate),
          "budget_key": "project.config.dataforseo.budget_credits_per_day"},
)
if use_gsc_cross_ref:
    events_writer.append_provenance(
        project_id=project_slug,
        run_id=op_run.run_id,    # same run as the on_page_content_parsing event
        source={"kind": "gsc_mcp", "mcp_server": "gsc",
                "mcp_tool": "gsc__search_analytics",
                "response_bytes": len(json.dumps(raw_gsc))},
        operation="project_excel",
        target_excel_sheet="on_page_audit",
        rows_written=0,    # GSC contributed cross-ref, not new rows
    )

Step 10 — complete

workflow_runner.complete(handle.run_id, project_slug=project_slug, outputs={
    # F5: outputs.* must be STRING-TYPED.
    "on_page_audit_rows": str(len(on_page_audit_rows)),
    "credits_used":       str(estimate),
    "report_path":        str(report_path),
    "raw_dfs":            str(inbox_path),
    "raw_gsc":            str(gsc_inbox) if use_gsc_cross_ref else "",
})

SF MCP Live Mode (Optional, use_sf_mcp_live=true — D-SF-11)

Default: use_sf_mcp_live=false — DFS on_page_content_parsing is the canonical on-page evidence source (paid; required tool). The SF MCP live cross-check is opt-in only and gated by a client.health() preflight; on probe failure the run AMBER-warns and continues without the SF cross-check (never hard-fail per R9 mitigation).

When use_sf_mcp_live=true, the SKILL body branches at Step 4 (transform) to optionally cross-check the per-URL title/meta/h1 signals against SF MCP's page_titles_all report.

This branch was rewritten (AC-13 replication) against the REAL SF MCP API — the same class of fix as tech-audit (landed in 6ee6fb9, live-proven on the demo-aluminum crawl) and the sf-crawl-orchestrator Step-5 export dispatch (a714e43). The engine canonical page_titles_all is NOT a Screaming Frog identifier: it maps via sf_crawl_orchestrator.SF_EXPORT_DISPATCH to the real sf_export_seo_element_urls tool with seo_element_name="Page Titles" + filter_name="All". There is NO crawl_id, report_name, or save_report arg; the export runs on the currently-loaded crawl and is written to file_path (relative to the SF allowed base directory). The real SF REJECTS inline output >100KB with a tool error — so file_path (write-to-disk) is the canonical export path (OQ-FILEPATH-EXPORTS), not a non-existent truncated flag.

The sf_list_crawls result comes back through SfMcpClient.call_tool as the MCP content envelope {"isError":false,"content":[{"text": "<JSON>"}]}, so the crawl list is JSON-encoded inside content[*].text (exactly like sf_crawl_progress). We decode the first JSON block, then match on url → instanceDirName. The real entry shape (Manager-probed) is {"url":"https://demo-aluminum.example/","instanceDirName":"fc718e3f-..."}.

Critical: a seo-element export is NDJSON, not CSV. sf_export_seo_element_urls has no export_type arg and always writes one flat JSON object per line (live-verified — export_returns_ndjson semantics). So the written file is converted to CSV text first via sf_crawl_orchestrator.ndjson_to_csv(...) (which emits a clean CSV header — no BOM), then parsed with csv.DictReader and passed into the transform's additive live_findings merge. The merge adds an SF crawl-truth row for every URL the DFS content_parsing set did NOT cover (DFS-covered URLs are never duplicated — rowcount(with) >= rowcount(without)); live_findings=None (the default) is byte-identical to the file-based path.

import csv
import json
from pathlib import Path
from scripts.ingestion import sf_crawl_orchestrator

def _decode_sf_envelope(result: dict):
    """Decode the first JSON payload from an SfMcpClient content envelope.

    SfMcpClient.call_tool returns {"isError":..,"content":[{"text":"<JSON>"}]}.
    Returns the parsed object (list/dict) or None if no JSON block is present.
    """
    for block in (result or {}).get("content", []) or []:
        if isinstance(block, dict) and isinstance(block.get("text"), str):
            try:
                return json.loads(block["text"])
            except ValueError:
                continue
    return None

def _norm_domain(u: str) -> str:
    """Normalise a URL for domain matching: drop scheme + leading www. +
    trailing slash."""
    bare = (u or "").strip().rstrip("/").split("://", 1)[-1].lower()
    return bare[4:] if bare.startswith("www.") else bare

amber_warnings: list[str] = []
live_findings: list[dict] = []   # parsed SF "Page Titles" rows (crawl truth)
if use_sf_mcp_live:
    from scripts.util.sf_mcp_client import (
        SfMcpClient, SfMcpToolError, SfMcpError,
    )
    sf_cfg = project_config["sf"]["mcp"]
    client = SfMcpClient(base_url=sf_cfg["url"])
    allowed_dir = Path(sf_cfg["allowed_directory"])  # SF write base (D-SF-10)
    if not client.health():
        # R9 AMBER fallback — SF MCP unreachable, continue without the SF
        # cross-check (DFS evidence is still authoritative).
        amber_warnings.append(
            "SF MCP unavailable (health probe failed); "
            "falling back to file-based path"
        )
    else:
        try:
            # 1) Resolve the crawl id: pick the crawl whose `url` matches the
            #    project domain (normalise scheme + leading www. + trailing
            #    slash), then take its `instanceDirName` (the real crawl id).
            list_resp = client.call_tool("sf_list_crawls")
            decoded = _decode_sf_envelope(list_resp)
            crawls = decoded if isinstance(decoded, list) else (
                decoded.get("crawls", []) if isinstance(decoded, dict) else []
            )
            target = _norm_domain(project_config["domain"])
            match = next(
                (c for c in crawls if _norm_domain(c.get("url", "")) == target),
                None,
            )
            if match is None:
                # R9 AMBER fallback — no crawl for this domain; do NOT hard fail.
                amber_warnings.append(
                    f"No SF crawl found for domain {project_config['domain']!r} "
                    "in sf_list_crawls; falling back to file-based path"
                )
            else:
                crawl_id = match["instanceDirName"]
                # 2) Ensure it is the active loaded crawl (resilient: tolerates
                #    the client-side load timeout, polls progress to confirm).
                client.load_crawl(crawl_id)

                # 3) Export the THREE on-page seo-element reports via the
                #    orchestrator dispatch — Page Titles + Meta Description + H1.
                #    page_titles_all carries ONLY 'Title 1' columns (live-verified
                #    2026-06-02: the Page Titles export has NO 'Meta Description 1'
                #    / 'H1-1' columns), so in_meta / in_h1 presence MUST come from
                #    their own exports — else every SF-only URL would be falsely
                #    flagged missing-meta / missing-h1. The >100KB inline cap is
                #    resolved by writing each to file_path.
                # 4) Each seo-element export is NDJSON (no export_type arg) →
                #    convert to clean CSV (ndjson_to_csv emits a BOM-free header)
                #    → DictReader → merge each export's columns per URL (Address).
                by_url: dict[str, dict] = {}
                for canonical, rel_path in (
                    ("page_titles_all", "page_titles_all.ndjson"),
                    ("meta_description_all", "meta_description_all.ndjson"),
                    ("h1_all", "h1_all.ndjson"),
                ):
                    tool, call_kwargs = sf_crawl_orchestrator.SF_EXPORT_DISPATCH[
                        canonical
                    ]
                    client.call_tool(tool, file_path=rel_path, **call_kwargs)
                    csv_text = sf_crawl_orchestrator.ndjson_to_csv(
                        (allowed_dir / rel_path).read_text(encoding="utf-8")
                    )
                    for row in csv.DictReader(csv_text.splitlines()):
                        addr = (row.get("Address") or "").strip()
                        if addr:
                            by_url.setdefault(addr, {"Address": addr}).update(row)
                live_findings = list(by_url.values())
        except (SfMcpToolError, SfMcpError) as exc:
            # R9 AMBER fallback — list/load/export failed (4xx/5xx, JSON-RPC
            # error, load_crawl settle timeout). NEVER hard fail.
            amber_warnings.append(
                f"SF MCP error: {exc}; falling back to file-based path"
            )

# Pass the parsed rows into the transform's additive merge (default
# None / [] → byte-identical file-based behaviour; DFS stays authoritative
# and SF-only URLs are surfaced as crawl-truth cross-check rows).
result = on_page_audit_transform.transform(
    raw_content_parsing,
    raw_gsc=raw_gsc,
    live_findings=(live_findings or None),
)

AMBER vs RED policy (R9 contract — never hard-fail this branch):

• client.health() returns False → AMBER warning, continue without the SF cross-check (DFS evidence remains the on_page_audit truth).
• No crawl matches the project domain in sf_list_crawls → AMBER warning, continue without SF.
• SfMcpToolError / SfMcpError raised (export 4xx/5xx, JSON-RPC error, load_crawl settle timeout) → AMBER warning, continue without SF.
• The transform tolerates an empty / absent live_findings gracefully (no extra rows), so any partial SF outage degrades to the DFS-only result with rowcount(with) >= rowcount(without) preserved.
• NEVER raise SystemExit from this branch. RED reserved for the existing DURUR set (budget, DFS schema drift, etc.).

Tool naming reminder: call_tool(tool_name=...) takes the native SF MCP tool name ("sf_export_seo_element_urls", "sf_list_crawls", "sf_load_crawl"), NOT the registry form ("sf__sf_export_seo_element_urls") or the Claude Code wrapper form ("mcp__sf__sf_export_seo_element_urls"). JSON-RPC params.name follows the native form per MCP spec. SfMcpClient already speaks the MCP Streamable-HTTP transport (session handshake + SSE), so the body only ever passes native tool names + the SF call kwargs.

amber_warnings is surfaced via the existing provenance event (an additional source.kind=sf_mcp event is emitted alongside the DFS+GSC events at Step 9). It is NOT a report template variable — the on-page-audit template renders no $amber_warnings field.

URL canonicalization (D-03 invariant)

Every URL passing through this skill is normalized via scripts.discovery.on_page_audit_transform._normalize_url. The function is idempotent: _normalize_url(_normalize_url(u)) == _normalize_url(u). Rules: lowercase scheme+host, IDN→punycode, strip default ports (:80/:443), strip trailing slash (root excluded), drop fragment, drop tracking params (utm_, gclid, fbclid, mc_, msclkid), sort remaining query keys.

Canonicalization is applied to BOTH the DFS URL field AND the GSC URL field (keys[0]) before the cross-source join, so a trailing slash or a fragment cannot desync the merge. See schemas/cross-sheet-invariants.json#D-03 for the project-wide rule.

DURUR conditions (9)

Stop and flag the manager — do not patch, do not fall back.

1. check_budget.py --check exit 1 (or preflight_budget() raises BudgetExceededError) → STOP, awaiting_approval; never silently skip the paid call.
2. DFS on_page_content_parsing payload has schema drift (item missing title, meta_description, or h1) → ContentParsingDriftError.
3. inbox/dfs/ (or inbox/gsc/) path cannot be created (workspace path missing or non-writable).
4. Cross-source URL normalization mismatch: DFS and GSC URL sets are disjoint after D-03 normalization. Default behaviour: graceful fall-back to no-cross-ref mode (every row → target_query="", action="no GSC available for this URL") and the run logs an explicit cross_ref_mismatch=true flag. Strict mode (strict_cross_ref=true): raise CrossRefMismatchError and stop — used when the operator wants to surface upstream drift loudly (e.g. www-vs-non-www host mismatch) rather than emit silent zeros.
5. master.xlsx#on_page_audit column count or names don't match schemas/master-excel.schema.json#on_page_audit (8 cols).
6. transaction.append raises RowSchemaError for on_page_audit.
7. workflow_runner.create_run fails schema validation.
8. PSEO_WORKSPACE_ROOT env unset and no explicit workspace_root arg passed to workflow_runner / events_writer.
9. Optional GSC call invoked but fails (auth/network/scope) → non-fatal: graceful degrade to no-cross-ref mode. Action column says "no GSC available for this URL". The skill DOES NOT stop — the DFS audit is still actionable on its own. (Documented design choice; the operator sees the degraded mode in the report.)

Cross-references

• Schemas: schemas/master-excel.schema.json#on_page_audit (8 cols), schemas/events.schema.json (source.kind=dataforseo_mcp + gsc_mcp, cost.credits field, target_excel_sheet=on_page_audit), schemas/skill-frontmatter.schema.json (this frontmatter), schemas/cross-sheet-invariants.json#D-03 (URL canonicalization), schemas/dataforseo-endpoint-mapping.schema.json (DFS contract; cost.credits_per_call for on_page_content_parsing).
• Cross-modules (IMPORT-only): scripts/state/workflow_runner.py, scripts/excel/transaction.py, scripts/state/events_writer.py, scripts/budget/check_budget.py, scripts/reporting/render_template.py.
• Transform: scripts/discovery/on_page_audit_transform.py (_normalize_url, transform, estimate_credits, preflight_budget, OnPageAuditError, ContentParsingDriftError, BudgetExceededError, CrossRefMismatchError).
• Tests: tests/skills/test_on_page_audit.py (≥10 cases incl. URL normalization edge cases, action heuristic coverage, budget pre-flight integration, cross-ref mismatch, schema drift DURUR).
• Template: templates/reports/on-page-audit.template.md.

Discipline checklist

• TODO/fallback YASAK — every DURUR raises explicitly; only the documented graceful-degrade modes (DURUR #4 default, #9) carry on.
• Schema-first — frontmatter validates against schemas/skill-frontmatter.schema.json Draft 7; master-excel.schema.json#on_page_audit defines the 8-col contract.
• Plugin-agnostik — no slug literals; project_slug flows through.
• Budget pre-flight integration — scripts.budget.check_budget invoked at step 1 BEFORE any paid DFS call (paid-MCP gate).
• Append-only — all events via events_writer; raw inbox JSON is write-once per (date, slug, tool).
• Cross-module IMPORT discipline — workflow_runner / transaction / events_writer / check_budget are imported, never modified from this skill.
• D-03 URL canonicalization applied BOTH sides of the cross-source join (DFS + GSC).
• F5: outputs.* values are STRING-TYPED (artifact paths or stringified counts), never raw ints.