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-adaptergit 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-adapter)<a href="https://agentmods.dev/skills/tacoda/keystone/keystone-new-adapter"><img src="https://agentmods.dev/badge/skills/tacoda/keystone/keystone-new-adapter/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-adapter"><img src="https://agentmods.dev/badge/skills/tacoda/keystone/keystone-new-adapter.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 | $0.00020 | $0.00426 |
| Opus 5 | $0.00010 | $0.00213 |
| Sonnet 5 | $0.00004 | $0.00085 |
| Haiku 4.5 | $0.00002 | $0.00043 |
Grade A, and why
keystone-new-adapter 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 9d 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-adapter — scaffold a host adapter
An adapter is the per-agent bundle that teaches one host how to
load the charter — three files per agent: lifecycle.md (how the host
invokes playbooks and actions), sensors.md (how it runs sensors), and
activation.md (the host's menu-file content).
Shipped adapters: claude-code, codex, cursor, aider, cline,
continue, goose, github-copilot, pi. Add a new one when
supporting a host not on that list.
Adapters live at .charter/adapters/<agent>/.
Run
keystone new adapter <agent>
Example:
keystone new adapter mistral
# writes .charter/adapters/mistral/{activation,lifecycle,sensors}.md
After scaffolding
- Fill in
lifecycle.md— how this host invokes the lifecycle (natural-language actions, slash commands, MCP tools, etc.). - Fill in
sensors.md— sensor invocation conventions for this host. - Fill in
activation.md— the host-native menu-file content the installer will project to the consumer's repo root. - Run
keystone indexto refresh the descriptor surface.
Full port contract:
docs/ports/adapter.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.
- 9d ago First seen · 61 lines · 20 tokens per session scan A 8a36e6cc55a8
keystone-new-adapter is a skill published in the GitHub repository tacoda/keystone (44 stars, last pushed 2mo ago), licensed MIT. It adds 20 tokens to every session and 426 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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