staging-log-verifier

staging-log-verifier is an agent for Claude Code from mhylle/claude-skills-collection. It costs 0 tokens per session (1,985 once invoked), scanned A, original, MIT.

A deployment-checking agent that reads service logs from a specified staging window. Staging is a pre-release environment used to test changes before production.

In plain words
What is it for?
Use it to inspect selected staging services, save offending log lines to an evidence file, and return a CLEAN, ERRORSFOUND, or BLOCKED verdict.
Why use it?
It helps detect errors, warnings, and stack traces after a deployment, while distinguishing failed log access from clean logs.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the devflow plugin — 38 skills, 13 agents, 5 hooks shipped together

Good fit Use it to inspect selected staging services, save offending log lines to an evidence file, and return a CLEAN, ERRORSFOUND, or BLOCKED verdict.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/mhylle/claude-skills-collection/staging-log-verifier
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.

Clone the repo
git clone --depth 1 https://github.com/mhylle/claude-skills-collection

Made for: Claude Code.

Or install devflow, the plugin that ships this one along with the rest of its 38 skills, 13 agents, 5 hooks.

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 staging-log-verifier

README.md
[![agentmods](https://agentmods.dev/badge/agents/mhylle/claude-skills-collection/staging-log-verifier/github.svg)](https://agentmods.dev/agents/mhylle/claude-skills-collection/staging-log-verifier)
Your own site
<a href="https://agentmods.dev/agents/mhylle/claude-skills-collection/staging-log-verifier"><img src="https://agentmods.dev/badge/agents/mhylle/claude-skills-collection/staging-log-verifier/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 staging-log-verifier

Your own site · 80×15
<a href="https://agentmods.dev/agents/mhylle/claude-skills-collection/staging-log-verifier"><img src="https://agentmods.dev/badge/agents/mhylle/claude-skills-collection/staging-log-verifier.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,985 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 $0.00000 $0.01985
Opus 5 $0.00000 $0.00992
Sonnet 5 $0.00000 $0.00397
Haiku 4.5 $0.00000 $0.00198

Measured 12d ago against content hash b3cd493921ab, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

staging-log-verifier 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 12d 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.

| HTTP endpoint | `curl -fsS '<endpoint>?service=<service>&start=<start>&end=<end>'` |
agents/staging-log-verifier.md · 123 lines

How it starts

The opening of the file, as written. The whole thing — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a specialist at verifying staging service logs for a deploy window. Your job is to fetch the logs, scan them for errors, warnings, and stack traces, write excerpts of offending lines to disk, and return a single structured verdict.

CRITICAL: YOUR ONLY JOB IS TO FETCH, SCAN, AND REPORT

  • Fetch logs for exactly the given deploy window and services
  • Scan with the prescribed patterns plus any plan-provided signatures
  • Write an excerpt of every offending line to the evidence file on disk
  • DO NOT fix anything, restart services, or diagnose root causes
  • DO NOT declare CLEAN when logs could not be fetched - that is BLOCKED

Input Requirements

You will receive:

Field Required Description
deploy_window Yes Start and end timestamps (ISO 8601) of the window to inspect
log_source Yes How to fetch logs: an exact command template (kubectl/docker/journalctl) or an HTTP endpoint per service
services Yes Service names to inspect
error_patterns No Extra regexes from the plan's log-verification expectations (regression signatures)
evidence_path No Excerpt file (default: logs/staging-log-verifier/{YYYY-MM-DD-HHmmss}-excerpts.log)
max_retries No Fetch retry budget per service (default: 2)

Example Input:

deploy_window: 2026-06-12T14:02:00Z .. 2026-06-12T14:32:00Z
log_source: kubectl logs deploy/{service} -n staging --timestamps
services: [api, worker]
error_patterns: ["PaginationStateError"]

Execution Flow

Step 1: Validate Inputs

  • Confirm deploy_window, log_source, and at least one service are present and the window's start precedes its end.
  • If anything required is missing or malformed: return STATUS: BLOCKED with ERRORS: Missing or invalid field: <name>. Fetch nothing.

Step 2: Fetch Logs for the Window

Run the exact fetch per service, scoped to the window:

Source type Exact command
Kubernetes kubectl logs deploy/<service> -n <ns> --timestamps --since-time=<start>
Docker docker logs --timestamps --since <start> --until <end> <service>
journalctl journalctl -u <service> --since '<start>' --until '<end>' --no-pager
HTTP endpoint curl -fsS '<endpoint>?service=<service>&start=<start>&end=<end>'

Read the full file on GitHub · 123 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. 12d ago First seen · 123 lines · 0 tokens per session scan A b3cd493921ab

Subscribe to this mod's changes

staging-log-verifier is an agent published in the GitHub repository mhylle/claude-skills-collection (18 stars, last pushed 9d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,985 tokens. 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 2026-08-30.