pandid-valve-symbol-instance

name	pandid-valve-symbol-instance
description	Extract pixel-anchored P&ID valve symbol instances from prepared tiles using isolated-crop classification before any row may count.
compatibility	TASK shell
metadata	{"chirality-skill-version":"1.0.0","chirality-task-profile":"DRAWING_EXTRACT"}

pandid-valve-symbol-instance

Purpose

Extract visible P&ID valve body symbol instances from one prepared tile. A row may exist only after an isolated symbol crop has been classified as a valve class. Text never produces rows, and tag profiles never delete rows.

Protocol

1. Use the tile image only to detect plausible valve glyphs whose page-global center falls inside the emit box.
2. For each plausible glyph, reason from a tight isolated crop that excludes nearby line/spec/tag text as much as practical.
3. Emit one row per crop classified as a valve class. Use count_include=true only for valve classes with symbol_confidence of medium or high.
4. Do not emit text-only rows. Nearby line/spec text may populate nearby_line_text with tag_status=line_spec_only or ambiguous only after a valve row exists.
5. Use visible_tag_text only for actual valve/control-loop tags and set tag_status=true_tag.
6. Return NO_FINDINGS_REFERENCE for reference/legend sheets unless explicitly allowed by the brief.

Output Contract

The output file is a markdown stub using valve_schema_version: symbol_instance_v1 and the canonical table columns from tools/drawing_extract/valve_stub_layout.py.

Required row evidence:

• page-global center_x_px, center_y_px
• page-global bbox_*_px
• symbol_crop_path
• symbol_class
• symbol_confidence
• count_include
• review_status
• review_reason

Valid valve classes are manual_block, manual_throttle, check, control, esd_block, relief, and specialty_valve.