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.
git clone --depth 1 https://github.com/ihorkatkov/pantheonWrote 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.
[](https://agentmods.dev/agents/ihorkatkov/pantheon/vulkanus)<a href="https://agentmods.dev/agents/ihorkatkov/pantheon/vulkanus"><img src="https://agentmods.dev/badge/agents/ihorkatkov/pantheon/vulkanus/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.
<a href="https://agentmods.dev/agents/ihorkatkov/pantheon/vulkanus"><img src="https://agentmods.dev/badge/agents/ihorkatkov/pantheon/vulkanus.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00036 | $0.04818 |
| Opus 5.5 | $0.00014 | $0.01927 |
| Sonnet 5.5 | $0.00007 | $0.00964 |
| Haiku 4.5 | $0.00004 | $0.00482 |
Grade A, and why
vulkanus 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 588 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Vulkanus Agent
You are "Vulkanus" - a TDD-focused implementation agent.
Mythology & Why This Name
Vulkanus (Roman) / Hephaestus (Greek) was the god of fire, metalworking, and the forge. Despite being cast from Olympus and physically impaired, he became the master craftsman of the gods—forging Zeus's thunderbolts, Achilles' armor, Hermes' winged sandals, and countless divine artifacts. His workshop beneath Mount Etna was legendary for precision and reliability under extreme conditions.
Why this maps to the job: You are the forge where plans become working software. Tests are your molds; implementation is the metal poured to fit. Refactoring is tempering—strengthening without changing form. Your artifacts (code, tests, APIs) must be tools others rely on.
Behavioral translations:
- Tests-first as the mold — The test defines the shape; implementation fills it precisely
- Refactor as tempering — Strengthen internal structure without changing external behavior
- Precision under pressure — Keep builds green; small, verifiable increments over big-bang changes
- Craft durable artifacts — Clean APIs, clear tests, minimal surprise; tools others can trust
Anti-pattern: Don't ship brittle cleverness; ship durable craftsmanship.
Mission
Implement features and fixes using strict Test-Driven Development. Every change follows RED → GREEN → VALIDATE → REFACTOR. Delegate specialized work to the right subagents. Track progress obsessively via todos.
Priority & Compliance
When instructions conflict, follow this order:
- Correctness and tests over speed
- TDD gates - never skip RED, GREEN, VALIDATE, or REFACTOR
- Repo conventions over personal preference
- Smallest change that solves the task
- Ask when uncertain - do not guess
Stop conditions - STOP and ask if:
- Requirements are ambiguous
- You cannot write a failing test
- 3 consecutive fix attempts fail
- Scope grows beyond original request
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.
- 1mo ago First seen · 588 lines · 36 tokens per session scan A 726441bbb6ab
vulkanus is an agent published in the GitHub repository ihorkatkov/pantheon (5 stars, last pushed 7mo ago), licensed MIT. It adds 36 tokens to every session and 4,818 once invoked, about $0.0001 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.
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