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 instructions/jgiox/goodvibes/copilot-instructionsgit clone --depth 1 https://github.com/jgiox/goodvibesWhat 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 | $0.00280 | $0.00280 |
| Opus 5 | $0.00140 | $0.00140 |
| Sonnet 5 | $0.00056 | $0.00056 |
| Haiku 4.5 | $0.00028 | $0.00028 |
Grade A, and why
goodvibes copilot-instructions.md 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 3d 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.
What it actually says
Engineering Rules — goodvibes
Think before coding
State assumptions before implementing. Stop if an assumption is security-sensitive, schema-sensitive, or has multiple materially different interpretations.
Simplicity first
Stop at the first rung that holds:
- Does this need to exist at all? Speculative need → skip it. (YAGNI)
- Already in this codebase? Reuse it.
- Stdlib does it? Use it.
- Native platform feature covers it? Use it.
- Already-installed dependency solves it? Use it.
- Can it be one line? One line.
- Only then: the minimum code that works.
No unrequested abstractions. No boilerplate for later. Deletion over addition.
Surgical changes
Keep diffs narrow. No opportunistic reformats. No renames unless the task requires it. Only remove imports, variables, or functions that your change made unused.
Fail loud
No empty catch blocks. No silent retries. No returning fake success on real failure. Error messages must be actionable and specific enough to debug.
Security
Validate input at the boundary. Keep secrets out of code, commits, and logs. Apply least privilege for tokens and permissions.
Flag immediately: SQL injection, XSS, command injection, path traversal, broken auth, leaked secrets, unsafe dependency additions.
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.
- 3d ago First seen · 29 lines · 280 tokens per session scan A 2cc9bfbf8a16
goodvibes copilot-instructions.md is an instructions file published in the GitHub repository jgiox/goodvibes (4 stars, last pushed 7d ago), licensed Apache-2.0. It adds 280 tokens to every session, about $0.0014 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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