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BD Nano Banana OpenRouter Skill

Generate images using Google's Nano Banana (Gemini 2.5 Flash Image) models via OpenRouter API.

modbender/skill-library-mcp Agent Skills author: modbender MIT 8 files body ≈ 291 tokens Open the sourcegithub.com↗ analyzed 2 d ago

Generate images using Google's Nano Banana (Gemini 2.5 Flash Image) models via OpenRouter API.

As a process D 49/100 · Unfinished process — weak spots: result and completion, when it triggers, inputs and preconditions

GeneratorSoftware developmentDesigntype and topics are labelled automatically from the skill text
Runs in: OpenClaw Claude / Claude Code ChatGPT / Codex Gemini CLI Cursor GitHub Copilot / VS Code Qwen Code Kimi Code CLI Z.ai (GLM) DeepSeek (Deep Code) Mistral Vibe LangChain (deepagents) Goose OpenCode
JSON
Technical rating
B
80/100
safety, quality, tests
Safety 60%
90
Quality 40%
64
Run on models
none yet
Process rating
D
49/100
Unfinished process
Result and completion w 14
0
Inputs and preconditions w 11
0
Failures and branches w 10
0
the three weakest of ten parameters · all ten

What is at stake

Medium-severity findings: the skill is probably honest, but read what alarmed the scanner.

Secrets in code medium severity

Below is the worst case for this category. The finding here is medium: the guard saw a sign, not a proof.

If you install

The files contain someone else's key or token. If it is live, your agent will call third-party services under a stranger's identity; if it was revoked, the skill's scripts simply fail. Such a key often arrives with the author's whole workspace, personal data included.

For the author

The key is visible to everyone who downloaded the skill and has likely been copied by catalog-scanning bots already. Revoke it now, check bills and access logs, then reissue.

How to improve

  1. Say in the description WHEN to use the skill ("use when…", example requests): that is the agent's main cue.
For the model run — optional
  • Your own cases (evals/evals.json, 4–6 real requests with expected answers): the full check would then run those instead of a model-drafted suite.
  • A spec.yaml with trigger phrases and assertions — a behaviour contract for CI; `skilltest init` writes a template.

Guard findings · 6

✓ No critical or high findings

Medium and low: 6
  • medium Secrets in code secret-openrouter-key test-gen.mjs:3
    OpenRouter API key (test fixture / example file; quoted — discussed, not commanded)
    const apiKey = "sk-o…cb3";
    fixturequoted
  • low Secrets in code secret-high-entropy-token output.json:3
    High-entropy token-like string (may be an id, hash or a credential) (quoted — discussed, not commanded)
    "id": "gen-…XW0",
    quoted
  • low Secrets in code secret-high-entropy-token output.json:24
    High-entropy token-like string (may be an id, hash or a credential) (detector / deny-list definition)
    "url": "data:image/png;base64,iVBO…gfh/QaDg…u9p+ULkapDENgzpj+Kl5
    detector
  • low Secrets in code secret-high-entropy-token package-lock.json:127
    High-entropy token-like string (may be an id, hash or a credential) (detector / deny-list definition)
    "integrity": "sha5…wQp+7C4n…9JQ==",
    detector
  • low Secrets in code secret-labelled-token test-gen.mjs:3
    Labelled token / key literal (vendor format unknown — verify it is not a live credential) (test fixture / example file)
    const apiKey = "sk-o…cb3";
    fixture
  • low Secrets in code secret-password-literal test-gen.mjs:3
    Hard-coded password / key literal (may be an example) (test fixture / example file)
    const apiKey = "sk-o…cb3";
    fixture

Files scanned: 8. Evidence is masked. Grey chips explain why severity was lowered.

Against the Agent Skills spec

  • warning name-format name should be kebab-case (lowercase letters, digits, hyphens)
  • warning description-no-when description does not say WHEN to use the skill (no "use when")

Process rating: all ten parameters 49/100

  • 0Result and completion. Does not say what the result is
  • 0Inputs and preconditions. Does not say what the process needs to start
  • 0Failures and branches. Linear process with no failure handling
  • 0Progress reporting. Says nothing while it works
  • 20When it triggers. No condition that starts the skill
  • 40Consistency. Frontmatter name (Nano Banana OpenRouter Skill) differs from the folder (nano-banana-openrouter)
  • 100Tools and files. No external tools needed
  • 100Steps. 7 steps
  • 100Execution cost. Instruction body is 291 tokens
  • 100Running it twice. No mutating operations

Everything here is measured from the skill text rather than judged by a model, so the numbers are checkable. A parameter weighs more when it is a more common reason for the process to stall.

Quality signals

  • +5Description has no quoted example phrases that should trigger the skill
  • +4Description does not say when NOT to use the skill (false activations)
  • +3Description length 94: 120–800 characters recommended
  • +3Output format is not stated: the model decides each time
  • +1No license
  • +2Single-language instructions
  • +4Structure: 5 headings
  • +3Step-by-step instructions: 7 items
  • +4Has examples (1 code blocks)

Quality base 70; lint remarks subtract, signals add up to 100. Result: 64.