The fine-dust proxy now resolves natural-language region hints through
city-level station lists and only returns a report when a single station
can be justified. When the hint is ambiguous, the proxy returns a small
candidate list so callers can retry with an exact station name instead
of silently guessing.
The skill guidance was updated to match that runtime contract: region
hint first, then retry with stationName when candidate_stations are
returned. Coordinate-centric guidance was removed from the primary skill
surface so the default path stays lightweight and consistent with the
live proxy behavior.
Constraint: The current AirKorea key can access city-level and station-level measurement APIs but station-info lookups may still return 403
Constraint: Free-API proxy responses must stay safe to expose publicly, so ambiguous locations should not be auto-guessed
Rejected: Auto-pick the first city-level station for unmatched district hints | hides ambiguity and returns misleading air-quality data
Rejected: Keep coordinate-first language in the primary skill | no coordinate source exists in the default user flow
Confidence: high
Scope-risk: moderate
Reversibility: clean
Directive: Preserve the ambiguous_location contract; if you improve matching later, prefer evidence-backed narrowing over silent fallback guesses
Tested: node --test scripts/skill-docs.test.js; npm run test --workspace k-skill-proxy; python3 -m unittest discover -s scripts -p test_fine_dust.py; live curl for ambiguous regionHint=광주 광산구 and exact stationName=우산동(광주)
Not-tested: Broader region alias quality outside the manually checked examples
The fine-dust lane now treats the public proxy as the default surface,
keeps a simple summarized report endpoint, and also exposes a narrow
AirKorea passthrough shape so callers can reuse upstream query patterns
without carrying service keys on the client side.
The skill instructions were trimmed down so the default path is obvious,
region-name guidance stays visible, and detailed implementation notes
move into feature docs instead of bloating the primary skill surface.
Constraint: Free-API proxy endpoints are intentionally public and must avoid embedding upstream secrets in the repo
Constraint: AirKorea station-info access can return 403 even when measurement access succeeds, so the report path needs a measurement-only fallback
Rejected: Keep proxy auth via shared token | contradicts the intended public free-API proxy policy
Rejected: Force all callers onto the summary endpoint only | passthrough compatibility is useful for direct HTTP consumers
Confidence: high
Scope-risk: moderate
Reversibility: clean
Directive: Keep the proxy allowlist narrow; if new upstream routes are exposed, document them explicitly rather than turning this into a generic open proxy
Tested: node --test scripts/skill-docs.test.js; npm run test --workspace k-skill-proxy; python3 -m unittest discover -s scripts -p test_fine_dust.py; live curls against /health, /v1/fine-dust/report, and /B552584/ArpltnInforInqireSvc/getMsrstnAcctoRltmMesureDnsty
Not-tested: Fresh reboot validation of PM2/cloudflared persistence after the latest code-only changes
The fine-dust helper still broke the documented station-name path
when the station lookup API returned no rows, and it guessed a
KHAI label from PM10 whenever the upstream API omitted khaiGrade.
This change locks both behaviors with regressions, resolves station
selection to a direct measurement lookup when only the station name
is usable, and reports 정보없음 when the source omits the KHAI field.
The docs now match the implemented fallback and missing-field behavior.
Constraint: Keep the fix compatible with existing fetch_station_payload callers and PR #21 scope
Rejected: Recompute KHAI from other pollutant fields | official formula/data inputs are not implemented in this helper
Rejected: Fail hard when station lookup is empty despite --station-name | contradicts the documented direct station-name fallback
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Do not synthesize 통합대기등급 from PM10/PM2.5 surrogates unless the official KHAI formula and inputs are implemented end-to-end
Tested: python3 scripts/test_fine_dust.py; npm run ci; python3 scripts/fine_dust.py report --station-file scripts/fixtures/fine-dust-stations.json --measurement-file scripts/fixtures/fine-dust-measurements.json --lat 37.5665 --lon 126.9780; python3 scripts/fine_dust.py report --station-file scripts/fixtures/fine-dust-stations.json --measurement-file scripts/fixtures/fine-dust-measurements.json --region-hint '서울 강남구'; python3 scripts/fine_dust.py --help; env -u AIR_KOREA_OPEN_API_KEY python3 scripts/fine_dust.py report --lat 37.5665 --lon 126.9780; python3 -m py_compile scripts/fine_dust.py scripts/test_fine_dust.py
Not-tested: Live Air Korea API responses with a real service key
PR #21 review found the live location path was sending raw WGS84 latitude/longitude into getNearbyMsrstnList. This updates the helper to convert WGS84 inputs into Air Korea's central-origin TM coordinates without adding a new dependency, adds regression coverage for the live request path plus fallback behavior, and aligns the published skill/docs examples with tmX/tmY usage.
Constraint: Air Korea nearby-station lookup requires TM coordinates and this repo should not add new runtime dependencies for a helper script
Rejected: Add pyproj/proj4 as a dependency | unnecessary dependency footprint for a deterministic coordinate transform
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep getNearbyMsrstnList on TM inputs only; if the upstream coordinate contract changes, verify against the official Air Korea docs before editing request params again
Tested: npm run ci; python3 scripts/fine_dust.py report --station-file scripts/fixtures/fine-dust-stations.json --measurement-file scripts/fixtures/fine-dust-measurements.json --lat 37.5665 --lon 126.9780; python3 scripts/fine_dust.py report --station-file scripts/fixtures/fine-dust-stations.json --measurement-file scripts/fixtures/fine-dust-measurements.json --region-hint '서울 강남구'; python3 scripts/fine_dust.py --help; env -u AIR_KOREA_OPEN_API_KEY python3 scripts/fine_dust.py report --lat 37.5665 --lon 126.9780; python3 -m py_compile scripts/fine_dust.py scripts/test_fine_dust.py
Not-tested: Live Air Korea API call with a real service key on this branch
Issue #17 approved an Air Korea two-API flow with a region fallback, so this change adds a new fine-dust skill, wires it into the repo docs/setup surfaces, and includes a runnable helper plus fixtures/tests for repeatable verification.
Constraint: Must use the approved official Air Korea APIs and secure secret registration flow
Rejected: Use an unofficial air-quality API | issue follow-up explicitly approved the Air Korea two-API flow
Rejected: Require coordinates only | issue discussion required a practical fallback when precise location is unavailable
Confidence: high
Scope-risk: moderate
Directive: Keep the helper and docs aligned with Air Korea endpoint names and fallback order if the official API contract changes
Tested: npm run ci; python3 scripts/fine_dust.py report --station-file scripts/fixtures/fine-dust-stations.json --measurement-file scripts/fixtures/fine-dust-measurements.json --lat 37.5665 --lon 126.9780; python3 scripts/fine_dust.py report --station-file scripts/fixtures/fine-dust-stations.json --measurement-file scripts/fixtures/fine-dust-measurements.json --region-hint '서울 강남구'; python3 scripts/fine_dust.py --help; missing-secret error path without AIR_KOREA_OPEN_API_KEY
Not-tested: Live Air Korea API calls with a real AIR_KOREA_OPEN_API_KEY
