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 tacoda/keystone --skill keystone-new-corpusgit clone --depth 1 https://github.com/tacoda/keystoneWrote 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/tacoda/keystone/keystone-new-corpus)<a href="https://agentmods.dev/skills/tacoda/keystone/keystone-new-corpus"><img src="https://agentmods.dev/badge/skills/tacoda/keystone/keystone-new-corpus/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/tacoda/keystone/keystone-new-corpus"><img src="https://agentmods.dev/badge/skills/tacoda/keystone/keystone-new-corpus.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 | $0.00016 | $0.00388 |
| Opus 5 | $0.00008 | $0.00194 |
| Sonnet 5 | $0.00003 | $0.00078 |
| Haiku 4.5 | $0.00002 | $0.00039 |
Grade A, and why
keystone-new-corpus 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
keystone:new-corpus — scaffold a corpus entry
A corpus entry is the long-form reasoning behind a rule. It lives
at .charter/corpus/<topic>/<name>.md and is opened only when
a guide's traces: (or a prose forward-link) points at it.
Most authors use keystone:new-guide, which scaffolds both the guide
and its paired corpus in one shot. Reach for keystone:new-corpus
only when adding reasoning to an existing guide that lacks one, or
when the corpus stands alone (rare).
Run
keystone new corpus <topic>/<name>
Example:
keystone new corpus idioms/rails/migrations
# writes .charter/corpus/idioms/rails/migrations.md
After scaffolding
- Fill in the body — the failure modes the paired rule guards against, the trade-offs, the references that informed it.
- Confirm the paired guide forward-links to this corpus entry (either
via
traces:in frontmatter or a proseFor reasoning, see ...footer). - Run
keystone indexto refresh the descriptor surface.
Full port contract:
docs/ports/corpus.md.
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 · 59 lines · 16 tokens per session scan A 713f32886e92
keystone-new-corpus is a skill published in the GitHub repository tacoda/keystone (44 stars, last pushed 2mo ago), licensed MIT. It adds 16 tokens to every session and 388 once invoked, about $0.0001 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 2026-08-30.
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