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 alessiomarcone/agent-fieldbook --skill knowledge-cardgit clone --depth 1 https://github.com/alessiomarcone/agent-fieldbookWrote 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/alessiomarcone/agent-fieldbook/knowledge-card)<a href="https://agentmods.dev/skills/alessiomarcone/agent-fieldbook/knowledge-card"><img src="https://agentmods.dev/badge/skills/alessiomarcone/agent-fieldbook/knowledge-card/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/alessiomarcone/agent-fieldbook/knowledge-card"><img src="https://agentmods.dev/badge/skills/alessiomarcone/agent-fieldbook/knowledge-card.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 | $0.00062 | $0.00349 |
| Opus 5 | $0.00031 | $0.00175 |
| Sonnet 5 | $0.00012 | $0.00070 |
| Haiku 4.5 | $0.00006 | $0.00035 |
Grade A, and why
knowledge-card 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 10d 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
Knowledge Card
Distill one source at a time into original, reusable operating knowledge.
References
references/knowledge-card-prompt.md— source-neutral card format and synthesis controls.references/knowledge-card.schema.json— exact YAML frontmatter schema.
Procedure
- Process one source per card. If several sources are supplied, handle them sequentially.
- Separate explicit source claims, reasonable inferences, and details that require current verification.
- Remove promotion and repetition; synthesize in original language rather than copying passages.
- Include source metadata, one-sentence summary, procedure, principles, reusable prompts, failure modes, verification, time-sensitive details, and related official material.
- Identify which stable rules should be promoted into a specialist skill and which should remain only in the card.
- Validate parsed YAML frontmatter against the schema and check that every body heading required by the prompt is present.
- When repository changes are requested, save under
knowledge/<product>/cards/with a kebab-case filename and update the relevant index.
Boundaries
- Preserve the source language only when useful; answer and summarize in the user's language.
- Mark time-sensitive product behavior as requiring verification against current official docs.
- Never commit raw transcripts or redistribute protected course lessons.
- Do not modify files when the user requested only an in-chat card.
What ships with it
3 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.
- 10d ago First seen · 31 lines · 62 tokens per session scan A 78ac293ed84c
knowledge-card is a skill published in the GitHub repository alessiomarcone/agent-fieldbook (5 stars, last pushed 2d ago), licensed MIT. It adds 62 tokens to every session and 349 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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