What is harness-optimizer?

An analysis agent that reviews Claude Code tool-call logs. A harness is the project's hooks, checks, and setup around the coding agent.

For suggesting hooks and checks, analyzing .claude/logs/, and improving an agent setup.

It helps identify setup changes based on actual usage instead of guesswork. Analysis requires logging to be enabled and enough usage data to reveal patterns.

harness-optimizer — Agent for Claude Code by ShipWithAI

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/ShipWithAI/shipwithai-plugins

Made for: Claude Code.

Or install shipwithai-starter, the plugin that ships this one along with the rest of its 13 skills, 4 commands, 1 agent.

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/shipwithai/shipwithai-plugins/harness-optimizer/github.svg)](https://agentmods.dev/agents/shipwithai/shipwithai-plugins/harness-optimizer)

Your own site

<a href="https://agentmods.dev/agents/shipwithai/shipwithai-plugins/harness-optimizer"><img src="https://agentmods.dev/badge/agents/shipwithai/shipwithai-plugins/harness-optimizer/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/shipwithai/shipwithai-plugins/harness-optimizer"><img src="https://agentmods.dev/badge/agents/shipwithai/shipwithai-plugins/harness-optimizer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 75 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 228 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.

Model	Per session	Once invoked
Fable 5.1	$0.00075	$0.00228
Opus 5.5	$0.00030	$0.00091
Sonnet 5.5	$0.00015	$0.00046
Haiku 4.5	$0.00007	$0.00023

Measured 2mo ago against content hash 4f1c014128ff, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

harness-optimizer 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 2mo 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.

plugins/starter/agents/harness-optimizer.md · 21 lines

What it actually says

Invoke /shipwithai-starter:optimize-harness and present the output directly to the user.

If the skill reports "Observability not enabled", explain:

The project needs /shipwithai-starter:setup-observability to start logging tool usage
After enabling, Claude Code must be used for at least 7 days before patterns can be analyzed
Tier 3 (Full) projects get this automatically during init; others can opt in anytime

If the skill reports "Not enough data yet", tell the user:

How many more days are needed
That the logging is already working — they just need to continue using Claude Code normally

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.

2mo ago First seen · 21 lines · 75 tokens per session scan A 4f1c014128ff

Subscribe to this mod's changes

harness-optimizer is an agent published in the GitHub repository ShipWithAI/shipwithai-plugins (9 stars, last pushed 2mo ago), licensed MIT. It adds 75 tokens to every session and 228 once invoked, about $0.0003 per session on Opus 5.5. 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.

Analytics and metrics Building agents Claude Code ai-coding claude-code-plugin developer-tools shipwithai

harness-optimizer next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
harness-optimizerShipWithAI/shipwithai-plugins	Agent	9	2mo ago	MIT	A	75	Claude Code
agents-expertclaude-world/director-mode-lite	Agent	80	20d ago	MIT	A	138	Claude Code
seo-assetsgreglas75/zuvo	Agent	7	7d ago	MIT	A	24	Claude Code
spec-reviewergreglas75/zuvo	Agent	7	7d ago	MIT	A	16	Claude Code
company-findergreglas75/zuvo	Agent	7	7d ago	MIT	A	55	Claude Code
debuggerKevinZai/commander	Agent	6	today	MIT	A	40	Claude Code
qa-engineerKevinZai/commander	Agent	6	today	MIT	A	40	Claude Code