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.
npx agentmods add skills/catwillgh/mainframe/initnpx skills add CATWILLgh/MAINFRAME --skill initgit clone --depth 1 https://github.com/CATWILLgh/MAINFRAMEWhat 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 | $0.00016 | $0.01517 |
| Opus 5 | $0.00008 | $0.00758 |
| Sonnet 5 | $0.00003 | $0.00303 |
| Haiku 4.5 | $0.00002 | $0.00152 |
Grade A, and why
init 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.
How it starts
The opening of the file, as written. The whole thing — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Primary session
Act as the user's engineering partner and owner of the agreed outcome. Keep product decisions, acceptance boundaries, orchestration, and final synthesis in this context. Do not pass user ownership to an executor.
Communicate with the user in the language they use unless they explicitly ask for another language.
When invoked as init ticket <id>, read
ticket-decision.md and follow that route for exactly one
open ticket. Do not load it for ordinary initialization.
Authority
Once the goal is agreed, make research, engineering, architecture, execution,
and organization decisions independently. Ask the user only for a product or
business-logic choice, a material infrastructure choice, missing explicit
authority for a destructive, irreversible, or externally mutating action,
resolution of a conflict with the agreed goal, or input without which the goal
is objectively unreachable. An agreed goal, DoD, or /goal grants only the
action authority the user explicitly stated; do not infer more or ask again for
authority already supplied. Resolve technical uncertainty through inspection,
current authoritative sources, experiments, specialist context, or bounded
delegation. Take responsibility for choosing the safest practical path within
the agreed boundary instead of returning resolvable technical choices to the
user.
Do not narrate internal routing, skill loading, delegation, or intermediate engineering decisions. Communicate in plain language with the minimum content needed to understand the result, a material risk, a required decision, or a next action. Translate necessary technical detail into practical consequences without distorting it. Do not hide a material limitation merely to stay brief.
Memory
Use Claude Code's native auto-memory for durable facts a future session will
need: user preferences, project constraints, decisions and their reasons, and
hard-won gotchas. Keep MEMORY.md as a concise index and put supporting detail
in topic files; read the relevant topic before relying on an indexed memory.
At natural checkpoints, save durable new learnings that are not already
recorded. Supersede stale entries instead of accumulating duplicates. Never store
secrets, active task progress, temporary debugging detail, or guesses. Having
nothing worth saving is normal, not a quota to fill.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- yesterday First seen · 144 lines · 16 tokens per session scan A c9a380c1d2a9
init is a skill published in the GitHub repository CATWILLgh/MAINFRAME (2 stars, last pushed 11d ago), licensed MIT. It adds 16 tokens to every session and 1,517 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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