Master context engineering for AI agent systems. Use when designing agent architectures, debugging context failures, optimizing token usage, implementing memory systems, building multi-agent coordination, evaluating agent performance, or developing LLM-powered pipelines. Covers context fundamentals, degradation patterns, optimization techniques (compaction, masking, caching), compression strategies, memory architectures, multi-agent patterns, LLM-as-Judge evaluation, tool design, and project development.

Audit a local or remote tabular file (CSV/TSV) for common data quality issues — schema, nulls, types, duplicates. Read-only. Use when a dataset needs a quality check before publishing, or a showcase renders wrong (blank cells, garbled numbers, an unsortable date column) and the cause needs isolating.

Recommend a data-portal architecture (storage, compute, catalog, access, hosting, metadata) from stated needs, then hand off to the build skills. The advisory entry point. Use when starting a new data-portal project and the underlying architecture has not yet been decided.

Auto-ingest a geospatial file (GeoJSON, Shapefile, GeoPackage, KML/KMZ, FlatGeobuf, CSV-with-geometry) into a PortalJS portal on the user's own machine, with no server. Normalizes CRS to EPSG:4326, derives a PMTiles render tier and a GeoParquet query tier, pushes all three artifacts to Cloudflare R2 via Git LFS, and appends one dual-tier datasets.json entry the showcase auto-renders. Use when the source is a vector geo format that needs a map or spatial-query view.

Use when evaluating military achievements for reward conferral. Systematically compiles kill counts (斩首), captures (捕虏), and territory gained to determine appropriate titles (侯), fief increases, and punishments for failures.

Use when studying Han-Xiongnu peace diplomacy. Covers the Heqin (和亲) system of marriage alliances, annual silk and grain tribute, border market establishment, and territorial boundary protocols along the Great Wall.

Use when commanding infantry-heavy forces against cavalry on flat terrain. Prioritizes speed over siege warfare, bypasses fortified cities, and seizes strategic objectives (armories like Luoyang武库, granaries like Ao) to neutralize cavalry advantages.

Use when advocating for your own inclusion in a mission or opportunity after being overlooked. Applies the 'point in a sheath' (锥处囊中) metaphor — reframing obscurity as lack of opportunity rather than lack of ability, and requesting a chance for talent to emerge.

Use when hosting guests, managing dependents, or building loyalty through hospitality. Provides equal treatment regardless of status, records personal details via a scribe behind a screen, sends follow-up gifts to guests' families, and resolves perceived slights through transparent demonstration.

Use when besieging a fortified enemy or planning encirclement warfare. Based on Bai Qi's victory at Changping (长平) — feign retreat to draw the enemy out, deploy hidden forces to cut retreat routes, sever supply lines, and wait 40+ days for starvation-driven collapse.

Use when a powerful minister faces suspicion from a ruler or when navigating dangerous court politics. Deploys four survival strategies — hostage-sending, deliberate self-pollution (自汙), graceful punishment acceptance, and honor-declining — to reduce perceived threat level.

Use when determining the optimal moment to launch a military campaign. Based on Fan Li's counsel to Goujian against Wu: wait for enemy to eliminate wise advisors, assess force deployment, confirm internal decay, verify leadership distraction, then strike with full force. Patience is critical.

Use when a ruler dies on military campaign and succession must be secured before news spreads. Covers securing final wishes, maintaining secrecy, road closures, heir retrieval with military escort, and formal installation before announcing the death, following King Zhao's field succession precedent.

Use when resolving disputed succession with multiple claimants or absent heirs. Provides priority ordering (太子, eldest legitimate son, talented son, brother), a resolution process with ministerial council, external power assessment, and rival neutralization protocols.

Use when handling foreign royals or nobles seeking asylum or refuge. Covers assessment of political status, evaluation of ally potential, and three response tiers: full hospitality with marriage alliance, basic courtesy with safe passage, or diplomatic refusal based on risk calculus.

Use when interpreting Zhou Yi (I Ching) hexagram readings or analyzing divination results. Covers hexagram transformation (本卦 to 之卦), line text analysis, fulfillment location and timing determination, and clan affiliation prediction, as demonstrated in Chen Li Gong's divination.

Use when establishing governance over newly conquered or acquired territory. Based on Zhou Gong's advice to Kang Shu for ruling former Shang lands: seek local wisdom, study prior regime failures, practice benevolent rule, establish legal frameworks, and appoint virtuous officials.

Use when establishing the fundamental pitch standard (黄钟) or deriving all twelve pitch pipes. Calculates the 9-cun base unit from powers of 3 and links musical tuning to weights, measures, and seasonal timing.

Use when managing tribute obligations or enforcing compliance across distance-based zones. Structures five concentric zones (五服制度) from daily offerings to lifetime homage, with escalation protocols for non-compliance.

Use when authorizing a military campaign or establishing battlefield discipline. Based on the Battle of Gan (甘之战), structures just-cause documentation, formal proclamation (誓), duty assignment, and post-battle accountability at ancestral shrines.