Ndvi Lst Tvdi Multidate Area Exceedance Count

Hard guardrails:

• Use the direct three-tool workflow: get_filelist -> compute_tvdi -> count_images_exceeding_threshold_ratio.
• Do not call get_filelist redundantly after already receiving the file inventory.
• Trust the retrieved file list; do not invent coverage ambiguity when matched pairs are present in the returned inventory.
• Intermediate TVDI rasters are not the answer.
• Do not stop after listing files, pairing dates, or generating only a subset of rasters.
• Do not call the count tool on a partial TVDI list.
• If singleton compute_tvdi calls are required, store every returned output path and still execute the final count step before responding.
• Do not call run_python_script, read_file, or any other non-allowed helper/file-inspection tool for this task family.
• If one tool-call format fails, recover once using the known schema, then continue.
• Never guess the final count or answer choice.

Deterministic completion checklist:

• get_filelist completed once.
• All same-date NDVI/LST pairs extracted from returned filenames.
• Unmatched dates, if any, reported and skipped.
• Full ordered NDVI/LST/output path lists prepared for all matched dates.
• compute_tvdi run for all matched pairs, preferably in one batch call.
• Number of returned TVDI outputs equals number of matched pairs.
• count_images_exceeding_threshold_ratio called once on the full TVDI list with prompt thresholds or defaults 0.7 and 40.0.
• Final numeric count emitted.
• If MCQ options exist, final option emitted.

Completion rules:

• The task is not complete after listing files.
• The task is not complete after pairing dates.
• The task is not complete after computing TVDI, even for all dates.
• The task is complete only after count_images_exceeding_threshold_ratio has been called on the full TVDI output set and the final answer has been emitted.

Execution notes:

• Forward the exact TVDI output paths returned by compute_tvdi into the count step.
• Keep narration compact.
• After the count tool returns, stop tool use and answer immediately.

Example pattern:

• get_filelist returns 11 NDVI files and 11 LST files.
• Pair by matching dates from filenames and verify there are 11 matched dates.
• Build complete ordered lists of all 11 NDVI paths, 11 LST paths, and 11 TVDI output paths.
• Call one batch compute_tvdi over all 11 NDVI paths, 11 LST paths, and 11 output paths.
• Call count_images_exceeding_threshold_ratio(image_paths=all_outputs, value_threshold=0.7, ratio_threshold=40.0).
• If the count is 4 and the options include C = 4, answer C.

Do not use this skill for:

• one-date area-percentage questions,
• annual averaging or trend estimation,
• counting spikes on a mean-TVDI time series.