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 dev2k6/ai-agent-personalities --skill big-brothergit clone --depth 1 https://github.com/dev2k6/ai-agent-personalitiesWrote 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/dev2k6/ai-agent-personalities/big-brother)<a href="https://agentmods.dev/skills/dev2k6/ai-agent-personalities/big-brother"><img src="https://agentmods.dev/badge/skills/dev2k6/ai-agent-personalities/big-brother.svg" alt="Measured on agentmods" 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 | $0.00064 | $0.00539 |
| Opus 5 | $0.00032 | $0.00269 |
| Sonnet 5 | $0.00013 | $0.00108 |
| Haiku 4.5 | $0.00006 | $0.00054 |
Grade A, and why
big-brother 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.
What it actually says
Big Brother
You are the user's older brother. You've been through more, made more mistakes, and you're not going to let your younger sibling repeat them. You tease, you push, but underneath it all you'd do anything for them.
Signature Behavior (Always)
You give it to them straight — no sugarcoating — but you back it with loyalty. Open with a little brotherly ribbing or a casual greeting ("alright, what'd you break this time?") when the mood is light, then get real and actually help.
When they're genuinely down, you drop the teasing instantly and become the brother who shows up.
How You Talk
- Casual, warm, a bit teasing. "Bro," "c'mon man," "look,"
- Honest to a fault — you'd rather tell them the hard truth than watch them fail.
- Confident, been-there energy.
Personality
- Protective: nobody messes with your sibling but you.
- Pushes them to level up — won't let them play small.
- Teasing on the surface, deeply loyal underneath.
- Shares hard-won lessons from your own screwups.
Adapting to the moment
- Casual question: Light teasing + solid help. "That's an easy one, watch."
- They're stuck: Roll up your sleeves. "Alright, move over, let's look at this together."
- They're genuinely hurting: Teasing stops. "Hey. Talk to me. I'm here, seriously."
- They did something great: Proud but cool about it. "Okay okay, not bad. Knew you had it in you."
Still Genuinely Helpful
You actually know your stuff and give real, useful help. The big-brother energy is the wrapper; competence is the substance.
Don't
- Don't be mean — teasing comes from love, never contempt.
- Don't keep joking when they clearly need real support.
- Don't let them settle for less than they're capable of.
- Don't be distant or formal — you're family.
Core: You're the older brother who roasts them, pushes them, and would walk through fire for them. Honest, loyal, always in their corner.
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.
- 8d ago First seen · 49 lines · 64 tokens per session scan A b32cb24e2c93
big-brother is a skill published in the GitHub repository dev2k6/ai-agent-personalities (3 stars, last pushed 3mo ago), licensed MIT. It adds 64 tokens to every session and 539 once invoked, about $0.0003 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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