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 skills add CATWILLgh/MAINFRAME --skill mainframe-harness-feedbackgit clone --depth 1 https://github.com/CATWILLgh/MAINFRAMEWrote 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/skills/catwillgh/mainframe/mainframe-harness-feedback)<a href="https://agentmods.dev/skills/catwillgh/mainframe/mainframe-harness-feedback"><img src="https://agentmods.dev/badge/skills/catwillgh/mainframe/mainframe-harness-feedback/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/skills/catwillgh/mainframe/mainframe-harness-feedback"><img src="https://agentmods.dev/badge/skills/catwillgh/mainframe/mainframe-harness-feedback.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 | $0.00737 |
| Opus 5.5 | $0.00014 | $0.00295 |
| Sonnet 5.5 | $0.00007 | $0.00147 |
| Haiku 4.5 | $0.00004 | $0.00074 |
Grade A, and why
mainframe-harness-feedback 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 9d 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 — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Report a MAINFRAME harness fault
Use this skill when available evidence indicates that MAINFRAME, an adapted MAINFRAME component, or the effective agent harness behaved incorrectly. Keep this feedback separate from the receiving project's issue queue.
First distinguish the owner of the problem:
- Use the receiving project's issue route for an application, data, infrastructure, or project-documentation defect.
- Repair a local project-harness configuration defect when that repair belongs to the assigned work and is authorized.
- Use this route when the evidence concerns MAINFRAME semantics, adaptation, discovery, precedence, registration, hooks, skills, agents, commands, permissions, or behavior across supported invocation trajectories.
Do not require a proven root cause before preserving a useful observation. State separately what was observed, what was reproduced, and what remains an inference.
Use the resolved MAINFRAME destination
Use only the configured feedback destination:
{{MAINFRAME_ROOT}}/docs/tickets/open/observations/
Treat an unresolved placeholder as an installation defect. Do not scan the home directory, other repositories, mounted volumes, application data, archives, backups, recovery directories, or Trash to guess the root. If the resolved root or the narrow feedback permission is unavailable, return feedback-ready content and the exact missing path, capability, or authorization to your immediate caller; do not write the report into the receiving project's queue or claim it was filed.
Use only the access needed to list open observations and create or update a matching record. Do not use the feedback permission to inspect or modify unrelated MAINFRAME content.
The destination may be absent before the first report. Create only the exact destination directory when writing the first real observation and the configured authority permits it.
Preserve useful evidence
Record:
- a concise factual title;
- the affected canonical or adapted component;
- the receiving agent product, version, and interface when known;
- the execution trajectory relevant to the fault, such as primary agent, subagent, reviewer, direct request, delegated task, Desktop, or CLI;
- the triggering action or condition;
- observed behavior and expected behavior when a source defines it;
- the practical consequence for the active work;
- minimal redacted evidence and reproduction status;
- remaining uncertainty.
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.
- 9d ago Changed · +9 tokens per session 98287dc2efd1
- 14d ago Changed · -48 tokens per session 40c135e7b5cd
- 1mo ago First seen · 59 lines · 75 tokens per session scan A 0c026aa96237
mainframe-harness-feedback is a skill published in the GitHub repository CATWILLgh/MAINFRAME (2 stars, last pushed 3d ago), licensed MIT. It adds 36 tokens to every session and 737 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 2026-09-08.
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