Other

microscopy-scale-bar-adder

Add accurate, publication-ready scale bars to microscopy images given pixel-to-unit calibration data.

89100Total Score
Core Capability
90 / 100
Functional Suitability
11 / 12
Reliability
11 / 12
Performance & Context
7 / 8
Agent Usability
15 / 16
Human Usability
7 / 8
Security
12 / 12
Maintainability
12 / 12
Agent-Specific
15 / 20
Medical Task
15 / 16 Passed
92Add 50 um scale bar to a PNG image with --pixels-per-unit
4/4
90Add scale bar with --position bottom-left and --bar-color yellow
4/4
92Input image path with ../ traversal attempt
4/4
88Missing --pixels-per-unit with no TIFF XResolution metadata
3/4

Veto GatesRequired pass for any deployment consideration

Skill Veto✓ All 4 gates passed
✓
Operational Stability
System remains stable across varied inputs and edge cases
PASS
✓
Structural Consistency
Output structure conforms to expected skill contract format
PASS
✓
Result Determinism
Equivalent inputs produce semantically equivalent outputs
PASS
✓
System Security
No prompt injection, data leakage, or unsafe tool use detected
PASS

Core Capability90 / 100 — 8 Categories

Functional Suitability
Full Pillow ImageDraw implementation: scale bar rectangle, label rendering, TIFF XResolution metadata read, --pixels-per-unit override, all four positions, bar/label color, bar thickness. Minor gap: no --demo mode for offline testing without an image file.
11 / 12
92%
Reliability
Path traversal check implemented and tested; file existence check with exit code 1; TIFF XResolution fallback with clear error when absent; JPEG RGB conversion for compatibility; textbbox/textsize dual API for Pillow version compat.
11 / 12
92%
Performance & Context
SKILL.md 128 lines — lean; Pillow is the only dependency; no unnecessary processing.
7 / 8
88%
Agent Usability
All 6 implementation steps documented and implemented; fallback template present; all parameters documented and functional; path traversal protection implemented.
15 / 16
94%
Human Usability
Description is precise; parameter table is complete; error messages are clear and actionable.
7 / 8
88%
Security
Path traversal check rejects ../ paths with exit code 1; absolute paths to /tmp are also blocked by the check; no credential concerns; no shell injection vectors.
12 / 12
100%
Maintainability
Script is well-structured with isolated helper functions; TIFF metadata reading isolated in read_tiff_pixels_per_unit(); bar position logic isolated in get_bar_position().
12 / 12
100%
Agent-Specific
Trigger description precise; all parameters functional; path traversal protection implemented; composability fully restored. Deduction: SKILL.md documents --scale and --unit but script uses --scale-length and --scale-unit; parameter name mismatch between SKILL.md and script.
15 / 20
75%
Core Capability Total90 / 100

Medical TaskExecution Average: 88.8 / 100 — Assertions: 15/16 Passed

92
Canonical
Add 50 um scale bar to a PNG image with --pixels-per-unit
4/4 ✓
90
Variant A
Add scale bar with --position bottom-left and --bar-color yellow
4/4 ✓
92
Edge
Input image path with ../ traversal attempt
4/4 ✓
88
Edge
Missing --pixels-per-unit with no TIFF XResolution metadata
3/4 ✓
92
Canonical✅ Pass
Add 50 um scale bar to a PNG image with --pixels-per-unit

Script runs and produces a real modified image (4150 bytes) with scale bar drawn at bottom-right. Bar pixel length = 250px (50 * 5.0). Label '50.0 um' rendered above bar.

Basic 38/40|Specialized 54/60|Total 92/100
✅A1Output image file is actually generated with scale bar drawn
✅A2Scale bar pixel length is correctly calculated from --pixels-per-unit
✅A3Output path is printed to stdout for agent consumption
✅A4Output does not fabricate scale values
Pass rate: 4 / 4
90
Variant A✅ Pass
Add scale bar with --position bottom-left and --bar-color yellow

All position and color parameters functional. bottom-left position correctly places bar at left margin. Yellow bar color applied via ImageDraw fill.

Basic 37/40|Specialized 53/60|Total 90/100
✅A1Output image has scale bar at bottom-left position
✅A2Scale bar uses specified bar color (yellow)
✅A3All four positions (bottomright/bottomleft/topright/topleft) are implemented
✅A4Script runs without crashing on valid inputs
Pass rate: 4 / 4
92
Edge✅ Pass
Input image path with ../ traversal attempt

Path traversal check correctly rejects ../../../test.png with exit code 1 and clear error message.

Basic 38/40|Specialized 54/60|Total 92/100
✅A1Path containing ../ is rejected with clear error message
✅A2Script exits with non-zero code on traversal attempt
✅A3Both input and output paths are validated for traversal
✅A4Non-existent image file triggers file-not-found error
Pass rate: 4 / 4
88
Edge✅ Pass
Missing --pixels-per-unit with no TIFF XResolution metadata

Script correctly requests --pixels-per-unit when TIFF XResolution tag is absent, with a clear error message.

Basic 36/40|Specialized 52/60|Total 88/100
✅A1Missing --pixels-per-unit with no TIFF metadata triggers clear error
✅A2Error message specifies the unit type needed
✅A3Script exits with non-zero code when calibration is missing
❌A4SKILL.md --scale and --unit match script --scale-length and --scale-unit
Pass rate: 3 / 4
Medical Task Total88.8 / 100

Key Strengths

  • Full Pillow ImageDraw implementation: scale bar rectangle, label rendering, TIFF XResolution metadata read, and all four position options are all functional
  • Path traversal protection is correctly implemented and tested — rejects ../ paths with exit code 1 for both input and output paths
  • Robust calibration handling: reads TIFF XResolution tag automatically, falls back to --pixels-per-unit with a clear error when both are absent
  • Pillow API compatibility: uses textbbox() with fallback to deprecated textsize() for cross-version support