runtime-detector

A runtime checker for KrakenD, an API gateway that routes requests to backend services. It determines whether to run KrakenD as a native program or in Docker and supplies the matching command.

In plain words
What is it for?
Use it when starting KrakenD, running a configuration, choosing a version, or deciding between Docker and a native binary.
Why use it?
It avoids using outdated Docker images or commands that do not match the available installation or configuration.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/krakend/claude-code-plugin/runtime-detector
Any agent
npx skills add krakend/claude-code-plugin --skill runtime-detector
Clone the repo
git clone --depth 1 https://github.com/krakend/claude-code-plugin

Made for: Claude Code, Codex.

Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 530 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00024 $0.00530
Opus 5 $0.00012 $0.00265
Sonnet 5 $0.00005 $0.00106
Haiku 4.5 $0.00002 $0.00053

Measured yesterday against content hash 46e38c71eed2, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

runtime-detector scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/runtime-detector/SKILL.md · 51 lines

What it actually says

Runtime Detector

Purpose

Determines the correct way to execute KrakenD commands by detecting available runtimes and providing ready-to-use commands with the appropriate Docker image or native binary.

When to activate

  • User asks to run/start/execute KrakenD: "run krakend", "start the gateway", "execute krakend"
  • User mentions Docker commands for KrakenD: "docker run krakend", "which docker image"
  • User asks how to run their config: "how do I run this", "start my config"
  • User asks about KrakenD versions or images: "which version", "what image to use"

CRITICAL: Always Use Runtime Detection

NEVER invent Docker images or commands. Always follow this process:

  1. Call detect_runtime_environment tool with the config file path
  2. Use the recommendations array from the response (ordered by priority)
  3. Use command_template from priority=1 recommendation
  4. If Docker needed, use recommended_image field for the image name

Common hallucinations to avoid:

  • devopsfaith/krakend (outdated)
  • krakend:latest without checking
  • krakend/krakend:version (wrong format)
  • ✅ Use exactly what detect_runtime_environment returns

What the tool returns

  • has_native_krakend: Whether native binary is installed
  • has_docker: Whether Docker is available
  • recommended_image: Correct Docker image (e.g., krakend:2.8 or krakend/krakend-ee:2.8)
  • recommendations: Array of execution options with command_template ready to use
  • is_enterprise: Whether config uses EE features

Example Interaction

User: "Run my krakend.json" Response: Call detect_runtime_environment, then provide the command from command_template. Explain if using native or Docker and why.

Integration

  • After config-validator validates successfully → Offer to run with this skill
  • After config-builder creates config → Offer to test run
  • If user needs to validate first → Hand off to config-validator
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 51 lines · 24 tokens per session scan A 46e38c71eed2

Subscribe to this mod's changes

runtime-detector is a skill published in the GitHub repository krakend/claude-code-plugin (3 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 24 tokens to every session and 530 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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