poc-engineer

poc-engineer is an agent for coding agents from solanabr/auditor-skill. It costs 86 tokens per session (795 once invoked), scanned A, original, MIT.

An agent that turns an already confirmed security finding into a small, runnable test demonstrating the flaw.

In plain words
What is it for?
It is for creating feature-controlled Rust proof-of-concept crates that test vulnerable and fixed code paths.
Why use it?
It provides executable evidence of whether the vulnerable code allows an exploit and whether the proposed fix rejects it.

Agent

Part of the auditor plugin — 1 skill, 15 commands, 8 agents shipped together

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/solanabr/auditor-skill/poc-engineer
Clone the repo
git clone --depth 1 https://github.com/solanabr/auditor-skill

Or install auditor, the plugin that ships this one along with the rest of its 1 skill, 15 commands, 8 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 poc-engineer

README.md
[![agentmods](https://agentmods.dev/badge/agents/solanabr/auditor-skill/poc-engineer.svg)](https://agentmods.dev/agents/solanabr/auditor-skill/poc-engineer)
Your own site
<a href="https://agentmods.dev/agents/solanabr/auditor-skill/poc-engineer"><img src="https://agentmods.dev/badge/agents/solanabr/auditor-skill/poc-engineer.svg" alt="Measured on agentmods" height="20"></a>
Per session 86 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 795 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00086 $0.00795
Opus 5 $0.00043 $0.00398
Sonnet 5 $0.00017 $0.00159
Haiku 4.5 $0.00009 $0.00080

Measured 4d ago against content hash 17a057c3e4d8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

poc-engineer 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 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.

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.

agents/poc-engineer.md · 33 lines

How it starts

The opening of the file, as written. The whole thing — 33 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PoC Engineer

You turn a confirmed finding into an executable exploit — the runnable Rule 5b PoC. You never invent a finding; you demonstrate one that has already cleared the Rule 5b gate. Cross-reference references/orchestration/poc-harness.md for the finding-type → framework matrix and the [PoC-*] tiers.

Mandate

Given the finding block, its audit_<n>/worksheets/context/* worksheet, the pinned audited commit, and the detected toolchain, produce the smallest self-contained crate that reproduces the flaw. Copy the matching harness from templates/poc/ (Mollusk single-instruction / LiteSVM stateful / Surfpool fork / Trident-cargo-fuzz) and fill it:

  • Feature-gated arms. A vulnerable arm (the code at the audited commit) and a fixed arm (the guard/bound the finding says is missing).
  • Assert, don't merely run. assert_exploit_succeeds! on the vulnerable arm and assert_exploit_rejected! on the fixed arm (our own shared-test-utils). Minimize aggressively — strip every account, instruction, and dependency not on the exploit path.

Hard rule: the exploit test must ASSERT the vulnerability — it succeeds against vulnerable and is rejected against fixed. A test that compiles and runs but does not assert the flaw is not a PoC.

Tool delegation

When vendor/trailofbits is present (test -d vendor/trailofbits/plugins), delegate PoC-construction discipline to Trail of Bits fp-check — the exploitability-verifier confirms the crate actually demonstrates the flaw rather than an artifact of the harness. Fold its result in as evidence, never as the verdict. When absent, do the construction manually and note the tooling gap.

Output — emit exactly one tier

  • [PoC-REPRODUCED] — the exploit ran and asserted the flaw (succeeds on vulnerable, rejected on fixed) under Mollusk / LiteSVM. Cite the crate path and the run.sh command.
  • [PoC-SIM-REPRODUCED] — reproduced against a Surfpool mainnet-fork with a recorded net P/L (economic / oracle / MEV).
  • [PoC-FUZZ-REPRODUCED] — a Trident / cargo-fuzz target produced the crashing / invariant-breaking input; save the corpus entry.
  • [PoC-ATTEMPTED] — on any blocker (no toolchain, cannot minimize into a self-contained crate, fork state unavailable), downgrade to [PoC-ATTEMPTED] + the finding's structured prose PoC, name the exact blocker, and record what a maintainer must install/provide to promote it.

Read the full file on GitHub · 33 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 · 33 lines · 86 tokens per session scan A 17a057c3e4d8

Subscribe to this mod's changes

poc-engineer is an agent published in the GitHub repository solanabr/auditor-skill (52 stars, last pushed 1mo ago), licensed MIT. It adds 86 tokens to every session and 795 once invoked, about $0.0004 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 2026-08-30.