harness-agent

An agent for working with model_proxy_v3, including setup, conversations, messages, history, and session management.

In plain words
What is it for?
It is for installing the agent, starting turns, reading conversation history, and controlling an agent session's lifecycle.
Why use it?
It organizes the steps needed to create an agent, run it, exchange messages, and manage its sessions.

Agent

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.

agentmods
npx agentmods add agents/qidu/model_proxy_v3/harness-agent
Clone the repo
git clone --depth 1 https://github.com/qidu/model_proxy_v3
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 2,994 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00000 $0.02994
Opus 5 $0.00000 $0.01497
Sonnet 5 $0.00000 $0.00599
Haiku 4.5 $0.00000 $0.00299

Measured yesterday against content hash b53f6fd3bdd7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

harness-agent 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 yesterday.

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.

docs/agents/harness-agent.md · 133 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. yesterday First seen · 133 lines · 0 tokens per session scan A b53f6fd3bdd7

Subscribe to this mod's changes

harness-agent is an agent published in the GitHub repository qidu/model_proxy_v3 (1 stars, last pushed yesterday), with no licence file. It costs nothing until one of its globs matches a file; then it loads 2,994 tokens. 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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