Patent — Prior-Art + Landscape Intelligence

Portability: Requires web_fetch (Google Patents, Espacenet, USPTO), WebSearch (adjacent academic art), Node.js with docx package, and optionally Lens.org API key for citation-graph signals. Works in Claude Code CLI natively. In Claude.ai with web tools + Code Execution + BYOK Lens.org, the workflow is supported.

Out of scope: trademark, copyright, trade-secret. These are flagged at intake. Use a different skill or qualified counsel.

Legal disclaimer: This skill produces search signal, not legal advice. Verdicts are technical assessments. Always consult a patent attorney before filing or licensing decisions.

Non-Generic Framing — The Differentiator

This skill is prior-art + landscape intelligence. It refuses to be a bucket. Every invocation commits to one of five sub-use-cases via the grill-me intake before any search runs. The chosen sub-use-case dictates the entire search strategy, ranking heuristics, and DOCX emphasis.

Sub-use-case	Search strategy	DOCX emphasis
Novelty search	Narrow + claims-text focused; pre-filing date irrelevant	Closest art + claim-differentiation
Freedom-to-operate	Broad + active patents only; jurisdiction-filtered	FTO flags + claim-by-claim risk
Competitive landscape	Breadth + filer tally + CPC trends	Filer map + investment hotspots
Acquisition diligence	Specific assignee + portfolio scope + assignment chain	Portfolio table + ownership verification
Litigation prior-art	Specific target patent + adjacent art before priority date	Knock-out candidates ranked by relevance

See references/sub_use_case_routing.md for the canon.

Agent Integrity Rules (Research-Pack Convention)

Locked verbatim per PR #657 audit.

• Execution discipline. Sequential search calls only. 1 query/sec rate limit. Confirm response received before next call.
• Source discipline. Cite only patents returned by THIS session's tool calls. Training knowledge labeled [Not from search — reference information] and excluded from counts.
• Three-count tracking. Queries sent / patents received (shown) / patents cited. Surfaced in audit log.
• Retry policy. On failure → wait 3s → retry once → log. After 3 consecutive failures across tools: stop, alert user, explain what's missing.
• Plan-tier detection. Lens.org free tier = 1000 queries/month. Google Patents has no auth but rate-limits per IP. Detect and surface caps.

Phase 1: Grill-Me Intake (6 forcing questions, one at a time)

Q1 (root) — Invention description

Describe the invention in 2–3 sentences. What does it do, and what's new about it?

Why I'm asking: Concept and keyword extraction depends entirely on a precise description. Vague descriptions ("AI for healthcare", "a better widget") will be rejected — push back and ask the user to specify what the invention does and what differentiates it from existing approaches.

Refuse mush. If answer is generic, ask once more: "What does it do that existing systems don't?" Then commit (with caveat in DOCX).

Q2 (depends on Q1) — Sub-use-case commitment

What's the purpose of this search? Pick one:

1. Novelty search (am I novel enough to file)
2. Freedom-to-operate (will I get sued if I ship)
3. Competitive landscape (who else plays here)
4. Acquisition diligence (does target really own X)
5. Litigation prior-art hunting (kill a specific patent)

Why I'm asking: Each path uses a fundamentally different search strategy. I'll refuse to start without you picking one.

Forcing format. If user says "all of them", push for the primary purpose — secondary purposes can run as follow-up searches.

Q3 (asked only if Q2 ∈ {FTO, landscape, diligence}) — Jurisdictions

Which jurisdictions matter? Pick all that apply: US / EP / CN / JP / KR / PCT / worldwide.

Why I'm asking: FTO only matters where you'll sell. Landscape changes radically by region. Diligence requires checking all jurisdictions where the target operates.

Skip for novelty (priority date is jurisdictionally portable) and litigation (jurisdiction is set by the target patent).

Q4 (depends on Q1) — Known prior art

Have you already seen prior art close to this? Cite a patent number or paper.

Why I'm asking: If you know one piece of art, I can search adjacent to it — much more precise than starting cold. If you don't, that's fine — just confirm.

Anchoring. Accept "none" but ask if the user has seen any related work even informally.

Q5 (depends on Q2) — Risk tolerance

Risk tolerance for this search: strict (one close hit means abandon the path) or signal-gathering (you want the lay of the land regardless)?

Why I'm asking: Strict mode ranks aggressively and surfaces verdict-grade hits; signal mode prioritizes breadth and visualizations.

Asked for novelty and FTO; skipped for pure landscape (always signal-gathering by definition).

Q6 (asked only if Q2 ∈ {novelty, FTO}) — Attorney status

Have you spoken to a patent attorney? This skill produces search signal, not legal advice. Confirm you understand this is for technical assessment only.

Why I'm asking: Novelty and FTO have legal consequences. The skill's verdict is signal-grade; legal positions require qualified counsel.

Triggers the legal-disclaimer footer in the DOCX. Skipped for landscape and diligence (lower legal exposure).

Stop condition: After Q6 (or earlier if dependency skips applied), commit and start Phase 2. Never re-open intake after Phase 2 begins.

Phase 2: Search Strategy Selection

Deterministic from intake answers. Use scripts/sub_use_case_router.py:

python scripts/sub_use_case_router.py \
  --sub-use-case novelty \
  --jurisdictions "" \
  --risk strict \
  --known-art "US10000000B2"

Returns: query plan (5-8 queries) + ranking heuristic + DOCX emphasis flags.

Phase 3: Multi-Source Search (Sequential)

Source priority

1. Google Patents (https://patents.google.com) — workhorse, no auth required, broad coverage
2. Espacenet (https://worldwide.espacenet.com) — global coverage, good for non-US art
3. USPTO PPS (https://ppubs.uspto.gov) — US deep dive
4. Lens.org (https://www.lens.org) — citation graph, BYOK API key required

Per-sub-use-case query patterns

Novelty:

• 3 narrow queries on invention-specific terminology (Google Patents)
• 2 broad concept queries with synonyms (Google Patents + Espacenet)
• 1 CPC-class-restricted query if class identified from initial hits

FTO:

• Jurisdiction-filtered: only active patents (not expired, not abandoned)
• Date filter: priority < today
• Active-claim text extraction for each hit

Competitive landscape:

• Broader queries on the technology space
• CPC class identification → tally top filers in that class
• 10-year filing trend by year per top-5 filer

Acquisition diligence:

• Specific assignee searches (target company + subsidiaries + named inventors)
• Assignment chain check (USPTO assignment recordation)
• Family resolution for deduplication

Litigation prior-art:

• Target patent input required (number)
• Priority date extraction
• Search for art before priority date in same CPC classes
• Adjacent-claim-language search

Sequential discipline

1 q/sec across ALL sources combined. Tracked via scripts/citation_tracker.py with timestamp-enforced gap.

Phase 4: Claim Extraction + Relevance Scoring

For each closest-art hit:

• Pull independent claim 1 (the broadest claim — primary anticipation/obviousness vehicle)
• Pull key dependent claims (claims that add the inventive step)
• Score relevance against invention description (overlap of claim language with Q1 terminology)

Rank by score. Verdict per sub-use-case (NOVEL / POTENTIALLY NOVEL / NOT NOVEL for novelty; CLEAR / FLAGGED / HIGH RISK per jurisdiction for FTO).

Phase 5: Citation Graph + Family Resolution

Citation graph (Lens.org BYOK)

If user provides Lens.org API key:

• Foundational-patent identification (cited-by count > threshold, typically 50+)
• Recent high-cite signals (citations in last 24 months as proxy for current activity)
• Forward citations from target patent (litigation prior-art) or from closest art (novelty)

If no Lens.org key: skip; note in audit log; recommend manual citation review on Google Patents.

Family resolution

Same invention often filed in multiple jurisdictions (US + EP + JP + CN). Group by family ID or priority number to avoid double-counting. Use scripts/family_resolver.py:

python scripts/family_resolver.py --hits-file hits.json
# Returns: deduplicated family list + family-member jurisdictions

CPC/IPC Classification Awareness

Critical: keyword search alone misses adjacent art. After initial search, extract the CPC/IPC classes from top 5 hits and run one class-restricted query. This consistently surfaces art that keyword search misses.

See references/cpc_classification_canon.md for the canon.

Phase 6: DOCX Generation (8 Sections)

Sub-use-case-dependent emphasis. Via Node.js + docx library.

1. Executive Summary + Verdict — Sub-use-case banner + one-line verdict (NOVEL / FLAGGED / etc.) + 3-4 key findings + legal disclaimer footer
2. Closest Prior Art — 5-10 patents in ranked order. Per hit: hyperlinked title + assignee + filing/priority dates + independent claim 1 text (italicized) + relevance score + relevance rationale (1-2 sentences)
3. Patent Landscape — Top filers table (top 10 by count) + 10-year filing trend description + CPC class distribution table. Only for landscape and diligence; abbreviated otherwise.
4. Citation Graph Signals — Foundational patents (if Lens-enabled) + recent high-cite activity. If Lens unavailable, note "manual review recommended" and skip table.
5. Geographic Coverage — Filings by jurisdiction for top 10 hits. Only for FTO, landscape, diligence; skipped for novelty and litigation.
6. FTO Flags (FTO only) — Active patents posing infringement risk. Per flag: hyperlinked patent + jurisdiction + relevant claims + risk level (HIGH/MEDIUM/LOW) + mitigation note.
7. Strategy + Recommendations — Sub-use-case-specific:
   • Novelty → claim differentiation suggestions
   • FTO → design-around hints + jurisdiction strategy
   • Landscape → who-to-watch list
   • Diligence → red flags in portfolio
   • Litigation → ranked knock-out candidates
   • Mandatory disclaimer to consult patent attorney for any filing/licensing decision.
8. Audit Log — Searches table (#, query, source, results, status), counts (sent/shown/cited), tool constraints (plan-tier notes), failed steps, attorney-consultation reminder

Styling

Arial 12pt body, navy headings (#1a3a5c), light blue table headers (#e8f0f8), red FTO-flag callout. ExternalHyperlink patterns:

• Google Patents: https://patents.google.com/patent/[number]
• Espacenet: https://worldwide.espacenet.com/patent/...
• USPTO: https://patents.uspto.gov/patent/...

Date Discipline

Distinguish at every hit:

• Filing date — when the application was first submitted
• Priority date — earliest claim of priority (often earlier than filing)
• Publication date — when the application became public (typically 18 months after priority)
• Grant date — when the patent was granted (later than publication)

Surface the legally-relevant date per sub-use-case:

• Novelty → priority date (vs invention's anticipated filing date)
• FTO → grant date + status (active vs expired)
• Landscape → publication date (when public knowledge began)
• Diligence → grant date + assignment date
• Litigation → priority date of target patent (sets the prior-art cutoff)

Phase 7: Deliver

• Save: <output-dir>/patent_<invention-slug>_<sub-use-case>_<YYYY-MM-DD>.docx
• Chat summary: file path + sub-use-case + verdict + audit counts + plan-tier
• Validate: check zip integrity with python3 -c "import zipfile,sys; zipfile.ZipFile(sys.argv[1]).testzip()" <docx> (no output = intact), then confirm the required sections are present
• Reminder: "Consult patent attorney before filing/licensing"

Tooling

Script	Role
scripts/citation_tracker.py	Multi-source three-count audit (Google Patents + Espacenet + USPTO + Lens.org) at ~/.patent_sessions/<session>.json
scripts/family_resolver.py	Group same-invention filings across jurisdictions by family ID / priority number
scripts/sub_use_case_router.py	Deterministic search-strategy selection from intake answers

References

• references/sub_use_case_routing.md — 5-sub-use-case canon (7+ sources)
• references/cpc_classification_canon.md — CPC/IPC class follow-up rationale (7+ sources)
• references/legal_disclaimer_discipline.md — when + why disclaimer mandatory (7+ sources)

Error Handling

Failure	Behavior
User refuses to commit to sub-use-case	Refuse to proceed. Re-ask Q2 with examples.
Invention description is generic	Reject answer. Re-ask Q1 with "what does it do that existing systems don't?"
Google Patents rate-limits	Wait 3s, retry once. Fall back to Espacenet for that query. Log in audit.
Lens.org key missing	Skip citation graph section, note "manual review recommended" in DOCX.
Claim text extraction fails	Fall back to abstract; flag as "abstract-only" in relevance rationale.
Family resolution incomplete	Note in audit; same-invention duplicates may appear; suggest manual deduplication.
All searches return <3 hits	Surface explicitly as "either niche art or genuine gap"; never fabricate.
3 consecutive tool failures	Stop, alert user, explain what's missing.
DOCX generation fails	Save raw data as JSON fallback so user doesn't lose work.
Target patent number invalid (litigation)	Validate format before search; ask user to confirm.

Anti-Patterns To Reject

• Starting any search before user commits to a sub-use-case (refuses generic "patent help")
• Batching all intake questions instead of one at a time
• Accepting vague invention descriptions ("AI for healthcare")
• Keyword-only search without CPC/IPC class follow-up
• Treating family members as separate hits (must be deduplicated)
• Confusing filing date with priority date with publication date
• Skipping the legal disclaimer when sub-use-case has legal consequences
• Reporting a verdict without claim-text evidence
• Fabricating Lens.org citation data when key is absent
• Suggesting design-arounds without acknowledging attorney review is required
• Skipping the audit log

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Version: 1.0.0 Source spec: megaprompts/11-patent-megaprompt.md Build pattern: Path B (direct conversion). Research-pack sibling, sub-use-case routing variant.