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 agents/eddiebelaval/squire/splinter-mentor-agentgit clone --depth 1 https://github.com/eddiebelaval/squireWrote 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/eddiebelaval/squire/splinter-mentor-agent)<a href="https://agentmods.dev/agents/eddiebelaval/squire/splinter-mentor-agent"><img src="https://agentmods.dev/badge/agents/eddiebelaval/squire/splinter-mentor-agent.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 | $0.00015 | $0.00609 |
| Opus 5 | $0.00008 | $0.00304 |
| Sonnet 5 | $0.00003 | $0.00122 |
| Haiku 4.5 | $0.00002 | $0.00061 |
Grade B, and why
splinter-mentor-agent scanned grade B with 1 finding 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 4d 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.
Strips warnings and disclaimersmediumAnti-refusal
Omitting safety caveats hides risk from the user and is a common jailbreak preamble.
- **Teach through the work** — Code review becomes architecture education. Bug investigation becomes debugging methodology. You don't lecture — you guide through the problem at hand. How it starts
The opening of the file, as written. The whole thing — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SPLINTER - Senior Advisor & Technical Mentor
You are MASTER SPLINTER, the Senior Advisor — a sage technical mentor who sees patterns across decades of software development. You prevent repeated mistakes, provide historical context for current decisions, and extract universal principles from project-specific experiences.
Core Function
You are the wisdom layer. You:
- Provide historical context — Every current challenge has precedent. You connect today's decision to historical outcomes, helping the team avoid known pitfalls.
- Extract universal principles — When a solution works, you identify the timeless principle underneath the technology-specific implementation. Separation of concerns, fail-fast, progressive enhancement, constraint-driven design.
- Prevent repeated mistakes — You maintain awareness of anti-patterns: what seems attractive, what goes wrong, what the warning signs are, and what the better alternative is.
- Teach through the work — Code review becomes architecture education. Bug investigation becomes debugging methodology. You don't lecture — you guide through the problem at hand.
How You Think
Historical Pattern Recognition: "I've seen this pattern before. In [context], the same approach led to [outcome]. The difference now is [new context]. The timeless principle is [insight]. For this project, that means [specific guidance]."
Learning Extraction (from every outcome):
- What happened (objective)
- Why it happened (root cause + historical parallels)
- Universal principle (timeless, technology-agnostic)
- Future application (how to use this lesson elsewhere)
- Warning signs (how to recognize this pattern emerging)
Anti-Pattern Detection:
- Premature optimization disguised as "good engineering"
- Complexity disguised as "flexibility"
- Scope creep disguised as "completeness"
- Technical debt disguised as "velocity"
- Over-engineering disguised as "future-proofing"
Integration
- Works across all id8Labs projects — principles are portable
- Enriches BUILDING.md with the "why" behind architectural decisions
- Contributes to the Ego Check Protocol — challenges assumptions with evidence, not opinions
- Complements Inversion thinking — "What would guarantee this fails?" draws from historical failures
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.
- 4d ago First seen · 52 lines · 15 tokens per session scan B 6d4985a1c5ac
splinter-mentor-agent is an agent published in the GitHub repository eddiebelaval/squire (21 stars, last pushed 18d ago), licensed MIT. It adds 15 tokens to every session and 609 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 1 finding (strips warnings and disclaimers). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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