runtime-verification

runtime-verification is a skill for Claude Code from synaptiai/synapti-marketplace. It costs 116 tokens per session (3,071 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; mentions CLAUDE.md; names the AskUserQuestion tool.

Part of the flow plugin — 31 skills, 21 commands, 9 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 31 skills, 21 commands, 9 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.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.svg" alt="Measured on agentmods" 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 3,071 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 $0.03071
Opus 5 $0.00058 $0.01536
Sonnet 5 $0.00023 $0.00614
Haiku 4.5 $0.00012 $0.00307

Measured 4d ago against content hash 49ceb38bf461, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, 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 4d 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.

| Backend/API | Start server, curl endpoints, verify responses, check logs |
plugins/flow/skills/runtime-verification/SKILL.md · 243 lines

How it starts

The opening of the file, as written. The whole thing — 243 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Runtime Verification

Domain skill for verifying code works at runtime, beyond static analysis and unit tests.

Iron Law

NO COMPLETION UNTIL THE CODE BUILDS, RUNS, AND BEHAVES CORRECTLY. If you cannot verify it yourself, build the infrastructure to verify it.

A green test suite is necessary but not sufficient. Runtime verification proves code actually works. "No test framework" is a problem to solve, not a reason to skip.

Skip Whitelist (Enumerated — No Subjective Exemptions)

Runtime verification is MANDATORY for every change. The only permitted skips are the three categories below. Any skip outside this whitelist is forbidden and must be escalated via the Proactive-Autonomy protocol (see below).

Skip Category Definition Required Evidence to Claim
markdown-only The diff touches only .md, .markdown, .txt, or .rst files. Zero code, config, or data files. git diff --name-only origin/$DEFAULT_BRANCH..HEAD output showing only doc extensions.
config-only The diff touches only configuration files (.json, .yaml, .yml, .toml, .ini, .env.example, dotfiles) with no executable code path changes. Config syntax must still be validated (lint/schema check, dry-run apply). Full file list plus syntax validation output.
dependency-bump-only The diff touches only lockfiles and manifest version strings (e.g., package.json version fields, package-lock.json, poetry.lock, Gemfile.lock, go.sum, Cargo.lock) with no source code, no config semantics, and no new dependencies. Build must still succeed. Full file list plus successful build output.

If the diff mixes any whitelisted category with anything else (a single .py or .ts file, a new dependency, a config value change that alters behavior), the skip is disallowed. Run full runtime verification.

If In Doubt, Run It

If you are uncertain whether the change qualifies for a whitelist skip — run runtime verification. Uncertainty is never a reason to skip. The cost of an extra verification run is small; the cost of shipping unverified code is large.

Read the full file on GitHub · 243 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. 4d 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 (6 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 116 tokens to every session and 3,071 once invoked, about $0.0006 per session on Opus 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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