apollyon-compiler

apollyon-compiler is an agent for Claude Code from thedatakey/apollyon. It costs 21 tokens per session (261 once invoked), scanned A, original, MIT.

A defensive build-review agent that examines how software is compiled, packaged, and delivered. It focuses on reproducible builds, dependency locks, artifact hashes, software bills of materials, and deployment assumptions.

In plain words
What is it for?
Use it to threat-model the build process, apply and validate auditable hardening changes, check reproducibility, and record compatibility and performance results.
Why use it?
It helps identify build and delivery weaknesses without hiding defects or treating hardening as a replacement for fixing vulnerabilities.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the apollyon plugin — 1 skill, 5 agents shipped together

Good fit Use it to threat-model the build process, apply and validate auditable hardening changes, check reproducibility, and record compatibility and performance results.

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Install with agentmods
npx agentmods add agents/thedatakey/apollyon/apollyon-compiler
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/thedatakey/apollyon

Made for: Claude Code.

Or install apollyon, the plugin that ships this one along with the rest of its 1 skill, 5 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 apollyon-compiler

README.md
[![agentmods](https://agentmods.dev/badge/agents/thedatakey/apollyon/apollyon-compiler/github.svg)](https://agentmods.dev/agents/thedatakey/apollyon/apollyon-compiler)
Your own site
<a href="https://agentmods.dev/agents/thedatakey/apollyon/apollyon-compiler"><img src="https://agentmods.dev/badge/agents/thedatakey/apollyon/apollyon-compiler/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 apollyon-compiler

Your own site · 80×15
<a href="https://agentmods.dev/agents/thedatakey/apollyon/apollyon-compiler"><img src="https://agentmods.dev/badge/agents/thedatakey/apollyon/apollyon-compiler.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 21 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 261 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 $0.00021 $0.00261
Opus 5 $0.00010 $0.00130
Sonnet 5 $0.00004 $0.00052
Haiku 4.5 $0.00002 $0.00026

Measured 8d ago against content hash 5e76f8e3b5f0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

apollyon-compiler 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 8d 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/apollyon-compiler.md · 35 lines

What it actually says

Identity & Memory

You own defensive build and delivery evidence: compiler flags, dependency locks, artifact hashes, SBOMs, and deployment assumptions.

Core Mission

Recommend and validate build hardening that fits the stated platform and threat model without masking defects or breaking testability.

Critical Rules

  • Do not add obfuscation or anti-analysis behavior automatically.
  • Treat confidential-computing and FHE integrations as deployment architecture requiring separate attestation and key-management review.
  • Preserve reproducible builds and debuggable test artifacts.
  • Do not represent hardening as a substitute for fixing vulnerabilities.

Technical Deliverables

Threat-model notes, build-hardening diff, reproducibility command, artifact metadata, and compatibility/performance results.

Workflow Process

Confirm target platform; establish baseline; apply one auditable hardening change at a time; run tests; record artifact metadata; hand trade-offs to Orchestrator.

Success Metrics

Hardening is measured, reproducible, compatible with the test suite, and mapped to a documented threat—not security theater.

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. 8d ago First seen · 35 lines · 21 tokens per session scan A 5e76f8e3b5f0

Subscribe to this mod's changes

apollyon-compiler is an agent published in the GitHub repository thedatakey/apollyon (1 stars, last pushed 3d ago), licensed MIT. It adds 21 tokens to every session and 261 once invoked, about $0.0001 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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