harness

harness is a skill for Claude Code from LogicLabsAI/ultramemory-mcp. It costs 68 tokens per session (386 once invoked), scanned A, original, Apache-2.0.

A gated build workflow that turns a coding request into a verified checklist before implementation begins. It pauses for approval, then coordinates multiple agents and runs a final verification command.

In plain words
What is it for?
Grounding a plan in the existing code, getting approval for the checklist and test command, coordinating checklist-based agents, and reporting their final results.
Why use it?
It prevents agents from starting with unverified assumptions or an unapproved plan. The approval gate also makes the expected checks explicit before work begins.

Skill for Claude Code

Written for Claude Code: $ARGUMENTS substitution.

Part of the ultramemory-kit plugin — 7 skills, 2 agents, 2 hooks shipped together

Good fit Grounding a plan in the existing code, getting approval for the checklist and test command, coordinating checklist-based agents, and reporting their final results.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/logiclabsai/ultramemory-mcp/harness
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 LogicLabsAI/ultramemory-mcp --skill harness
Clone the repo
git clone --depth 1 https://github.com/LogicLabsAI/ultramemory-mcp

Made for: Claude Code.

Or install ultramemory-kit, the plugin that ships this one along with the rest of its 7 skills, 2 agents, 2 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 harness

README.md
[![agentmods](https://agentmods.dev/badge/skills/logiclabsai/ultramemory-mcp/harness/github.svg)](https://agentmods.dev/skills/logiclabsai/ultramemory-mcp/harness)
Your own site
<a href="https://agentmods.dev/skills/logiclabsai/ultramemory-mcp/harness"><img src="https://agentmods.dev/badge/skills/logiclabsai/ultramemory-mcp/harness/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 harness

Your own site · 80×15
<a href="https://agentmods.dev/skills/logiclabsai/ultramemory-mcp/harness"><img src="https://agentmods.dev/badge/skills/logiclabsai/ultramemory-mcp/harness.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 386 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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 $0.00068 $0.00386
Opus 5 $0.00034 $0.00193
Sonnet 5 $0.00014 $0.00077
Haiku 4.5 $0.00007 $0.00039

Measured 12d ago against content hash c7923b0353e5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

harness 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 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.

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.

agent-kit/skills/harness/SKILL.md · 36 lines

What it actually says

Harness — one command, full rails

Task: $ARGUMENTS

Run these stages IN ORDER. Never start building before Stage 2 approval.

1 — Ground the plan (no memory)

Follow atomic-level-checklist-md-confirm-approval-needed for the task above: verify every fact (paths, literal strings, schemas, endpoints) against actual source — never from memory — and emit a machine-readable checklist in checklist-bound-execution format: each item = {id, title, files[], spec, acceptance_criteria[], status}.

2 — STOP for approval (hard gate)

Present the checklist AND the proposed global gate command (e.g. npm run build && npm test). Do NOT proceed until the user explicitly approves both the plan and the gate command.

3 — Execute through the harness

Follow checklist-bound-execution. Its step 0 arms the deterministic gate by writing the approved command to .claude/.harness-active, then it embeds the checklist verbatim in the Workflow template, partitions by file, and runs worker -> verifier with bounded loop-back using agentType checklist-worker / checklist-verifier.

4 — Report

Summarize each item's final verdict plus any deviations or blocks. On turn end, the global Stop hook runs the gate: on failure it blocks the stop and feeds back exactly what to fix; on green it disarms automatically. You are not done until the gate is green.

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 · 36 lines · 68 tokens per session scan A c7923b0353e5

Subscribe to this mod's changes

harness is a skill published in the GitHub repository LogicLabsAI/ultramemory-mcp (1 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 68 tokens to every session and 386 once invoked, about $0.0003 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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