nano-banana-prompts
Generate optimized prompts for Gemini 2.5 Flash Image (Nano Banana). Use for image generation, crafting photo prompts, art styles, or multi-turn editing workflows with best practices.
Install with Tessl CLI
npx tessl i github:secondsky/claude-skills --skill nano-banana-prompts85
Does it follow best practices?
If you maintain this skill, you can automatically optimize it using the tessl CLI to improve its score:
npx tessl skill review --optimize ./path/to/skillValidation for skill structure
Discovery
89%Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.
This is a solid skill description with clear trigger terms and explicit 'Use for' guidance that answers both what and when. The main weakness is moderate specificity - it could benefit from listing more concrete actions beyond 'optimized prompts' and 'multi-turn editing workflows'. The distinctive model name provides excellent differentiation from other skills.
Suggestions
Add more specific concrete actions such as 'style transfer prompts', 'aspect ratio optimization', or 'negative prompt crafting' to improve specificity
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Names the domain (Gemini 2.5 Flash Image/Nano Banana) and mentions actions like 'generate optimized prompts', 'crafting photo prompts', 'multi-turn editing workflows', but lacks concrete specific actions like what optimization entails or what editing operations are supported. | 2 / 3 |
Completeness | Clearly answers both what ('Generate optimized prompts for Gemini 2.5 Flash Image') and when ('Use for image generation, crafting photo prompts, art styles, or multi-turn editing workflows'). The 'Use for' clause serves as explicit trigger guidance. | 3 / 3 |
Trigger Term Quality | Good coverage of natural terms users would say: 'image generation', 'photo prompts', 'art styles', 'Gemini', 'Nano Banana'. These are terms users would naturally use when seeking this capability. | 3 / 3 |
Distinctiveness Conflict Risk | Highly distinctive with specific model name 'Gemini 2.5 Flash Image (Nano Banana)' as a clear niche. Unlikely to conflict with generic image or prompt skills due to the specific platform targeting. | 3 / 3 |
Total | 11 / 12 Passed |
Implementation
77%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This is a highly actionable skill with excellent concrete examples, templates, and validation workflows for image prompt generation. The main weakness is its length—the content would benefit from progressive disclosure by splitting detailed reference material (troubleshooting tables, validation checklists, style-specific templates) into separate files while keeping the SKILL.md as a concise overview with links.
Suggestions
Split detailed sections (Common Issues & Solutions, Prompt Validation, Troubleshooting Guide) into separate reference files like TROUBLESHOOTING.md and VALIDATION.md, keeping SKILL.md as a concise overview
Remove redundant content—the troubleshooting table largely duplicates the Common Issues section, and the validation checklist repeats the Quick Prompt Checklist
Add clear navigation links at the top of the file pointing to the different sections or split-out reference files
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The skill is comprehensive but includes some redundancy (e.g., the validation checklist repeats information from earlier sections, and the troubleshooting table duplicates the Common Issues section). Some sections could be tightened, though it avoids explaining basic concepts Claude would know. | 2 / 3 |
Actionability | Excellent actionability with concrete, copy-paste ready prompt templates, specific examples for each use case (photography, art, product, landscape), and clear parameter values (lens focal lengths, f-stops, aspect ratios). Every section provides executable guidance. | 3 / 3 |
Workflow Clarity | Clear multi-turn editing workflow with explicit sequencing (one change at a time), validation checklists with checkboxes, a complete validation example, and a refinement workflow with numbered steps. The troubleshooting guide provides clear feedback loops for error recovery. | 3 / 3 |
Progressive Disclosure | Content is well-organized with clear section headers, but this is a monolithic 400+ line file that could benefit from splitting detailed sections (troubleshooting, validation checklists, style-specific templates) into separate reference files. No external file references are provided. | 2 / 3 |
Total | 10 / 12 Passed |
Validation
87%Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.
Validation — 14 / 16 Passed
Validation for skill structure
| Criteria | Description | Result |
|---|---|---|
description_trigger_hint | Description may be missing an explicit 'when to use' trigger hint (e.g., 'Use when...') | Warning |
metadata_version | 'metadata' field is not a dictionary | Warning |
Total | 14 / 16 Passed | |
- Reviewed
Table of Contents
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