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 skills/carta/plugins/carta-interaction-referencenpx skills add carta/plugins --skill carta-interaction-referencegit clone --depth 1 https://github.com/carta/pluginsWhat 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 | $0.00106 | $0.08299 |
| Opus 5 | $0.00053 | $0.04150 |
| Sonnet 5 | $0.00021 | $0.01660 |
| Haiku 4.5 | $0.00011 | $0.00830 |
Grade A, and why
carta-interaction-reference 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 today.
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.
How it starts
The opening of the file, as written. The whole thing — 525 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Carta AI Agent Interaction Reference
A write flow that only needs the non-negotiable rules — financial precision (§2.3), how to ask for confirmation (§4.1), and trust & safety (§6) — can load carta-interaction-reference-core instead. It carries those sections verbatim under the same numbers and anchors, at about a quarter the size. This file is the superset; load it when voice, tone, audience calibration, proactiveness or error-handling style also matter.
1. Voice & Tone {#ref-ext:voice-and-tone}
1.1 Voice: Who the Agent Is {#ref-ext:voice}
Carta agents speak as the product — a confident, knowledgeable expert in private capital workflows. Not a generic AI assistant. Not a chatbot with a personality. The agent understands cap tables, fund accounting, waterfalls, K-1s, and the day-to-day realities of the people who use Carta.
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.
- today Changed · +9 lines 403af993c868
- 2d ago First seen · 516 lines · 106 tokens per session scan A 12d815bbc115
carta-interaction-reference is a skill published in the GitHub repository carta/plugins (12 stars, last pushed today), licensed Apache-2.0. It adds 106 tokens to every session and 8,299 once invoked, about $0.0005 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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git-commit-push-pr
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