runtime-verification

runtime-verification is a skill for Claude Code from synaptiai/synapti-marketplace. It costs 116 tokens per session (1,288 once invoked), scanned A, original, Apache-2.0.

A runtime-checking workflow that verifies code builds, starts, and behaves correctly, including end-to-end checks and UI screenshots when needed.

In plain words
What is it for?
Use it to verify application changes before marking work complete, with build checks, diagnostics, smoke tests, end-to-end tests, and visual checks for interface changes.
Why use it?
It catches failures that static checks or unit tests can miss, especially when a project lacks a test framework.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: agent in frontmatter; names the AskUserQuestion tool.

Part of the flow plugin — 33 skills, 20 commands, 10 agents shipped together

Good fit Use it to verify application changes before marking work complete, with build checks, diagnostics, smoke tests, end-to-end tests, and visual checks for interface changes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/synaptiai/synapti-marketplace/runtime-verification
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.

Any agent
npx skills add synaptiai/synapti-marketplace --skill runtime-verification
Clone the repo
git clone --depth 1 https://github.com/synaptiai/synapti-marketplace

Made for: Claude Code.

Or install flow, the plugin that ships this one along with the rest of its 33 skills, 20 commands, 10 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for runtime-verification

README.md
[![agentmods](https://agentmods.dev/badge/skills/synaptiai/synapti-marketplace/runtime-verification/github.svg)](https://agentmods.dev/skills/synaptiai/synapti-marketplace/runtime-verification)
Your own site
<a href="https://agentmods.dev/skills/synaptiai/synapti-marketplace/runtime-verification"><img src="https://agentmods.dev/badge/skills/synaptiai/synapti-marketplace/runtime-verification/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for runtime-verification

Your own site · 80×15
<a href="https://agentmods.dev/skills/synaptiai/synapti-marketplace/runtime-verification"><img src="https://agentmods.dev/badge/skills/synaptiai/synapti-marketplace/runtime-verification.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 116 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,288 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00116 $0.01288
Opus 5.5 $0.00046 $0.00515
Sonnet 5.5 $0.00023 $0.00258
Haiku 4.5 $0.00012 $0.00129

Measured 1mo ago against content hash d56f35b0146f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

runtime-verification scanned grade A with 1 finding 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 1mo ago.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

5. **Smoke**: `curl` `/health` and `/`; non-200 is a P1 finding (`references/finding-schema.md`).
plugins/flow/skills/runtime-verification/SKILL.md · 62 lines

How it starts

The opening of the file, as written. The whole thing — 62 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Runtime Verification

Contract

Iron law: no completion until the code builds, runs, and behaves correctly; if you cannot verify it, build the infrastructure to verify it. Invoked after quality checks pass by /flow:start Phase 4 step 2, /flow:pr Phase 4 via Agent(integration-verifier), and the address-pr, debug, and start-issue workflows. Returns the Runtime Verification Results and Acceptance Criteria Verification tables, with failures as P1 findings (category=runtime). Permitted skips: only markdown-only, config-only, or dependency-bump-only, each with its listed evidence; any other skip needs an approved six-field escalation via AskUserQuestion.

Skip Whitelist

Category Definition Required evidence
markdown-only Only .md, .markdown, .txt, .rst files git diff --name-only origin/$DEFAULT_BRANCH..HEAD showing only doc extensions
config-only Only config files (.json, .yaml, .yml, .toml, .ini, .env.example, dotfiles) with no code-path change; syntax still validated (lint/schema, dry-run) Full file list plus validation output
dependency-bump-only Only lockfiles and manifest version strings (package.json version, package-lock.json, poetry.lock, Gemfile.lock, go.sum, Cargo.lock); no source, config semantics, or new dependencies; build still succeeds Full file list plus build output

Mixed diffs (a whitelisted category plus one .py file, a new dependency, or a behavior-changing config value) get full verification. "Small change", "CI-only", "tests cover this", "just a refactor" are not categories.

Out-of-whitelist skips (anything uncovered): raise a Proactive-Autonomy escalation per references/escalation-format.md via AskUserQuestion and wait for approval; Situation cites why the whitelist misses the change, Tried lists the fast-path, build, and smoke attempts. Blanket repo-wide authorization is never valid.

Read the full file on GitHub · 62 lines

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. 1mo ago Changed · -181 lines d56f35b0146f
  2. 1mo ago First seen · 243 lines · 116 tokens per session scan A 49ceb38bf461

Subscribe to this mod's changes

runtime-verification is a skill published in the GitHub repository synaptiai/synapti-marketplace (7 stars, last pushed 7d ago), licensed Apache-2.0. It adds 116 tokens to every session and 1,288 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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