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 cynco-labs/ai-accounting-skills --skill open-favagit clone --depth 1 https://github.com/cynco-labs/ai-accounting-skillsWrote 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/cynco-labs/ai-accounting-skills/open-fava)<a href="https://agentmods.dev/skills/cynco-labs/ai-accounting-skills/open-fava"><img src="https://agentmods.dev/badge/skills/cynco-labs/ai-accounting-skills/open-fava/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/cynco-labs/ai-accounting-skills/open-fava"><img src="https://agentmods.dev/badge/skills/cynco-labs/ai-accounting-skills/open-fava.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 | $0.00030 | $0.00378 |
| Opus 5 | $0.00015 | $0.00189 |
| Sonnet 5 | $0.00006 | $0.00076 |
| Haiku 4.5 | $0.00003 | $0.00038 |
Grade A, and why
open-fava 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 12d 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
/open-fava
Purpose
Fava is the impressive UI on top of Beancount — local browser, not Excel.
ledger/main.beancount → fava → http://127.0.0.1:5000
Preconditions
- Ledger exists (
export-beancountfirst if not) bean-checkPASS (run validate skill)favainstalled:pip install fava beancount
Command
scripts/run_fava.sh path/to/main.beancount
# custom port
scripts/run_fava.sh path/to/main.beancount --port 5001
Or:
fava --host 127.0.0.1 --port 5000 path/to/main.beancount
Agent behavior
- Validate ledger first
- Start Fava in background if the host supports long-running processes
- Tell the user the URL:
http://127.0.0.1:5000 - Default bind localhost only — do not expose
0.0.0.0unless user asks - If fava missing: print install one-liner; do not pretend UI is open
What to show the user
- Income Statement / Balance Sheet in Fava
- Account tree
- Journal entries from export
Completion
Done when: bean-check PASS, Fava started (or install instructions), user given localhost URL.
Security
Client financial data stays local. No public tunnel unless explicitly requested.
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.
- 12d ago First seen · 60 lines · 30 tokens per session scan A cd4136616830
open-fava is a skill published in the GitHub repository cynco-labs/ai-accounting-skills (3 stars, last pushed 2mo ago), licensed MIT. It adds 30 tokens to every session and 378 once invoked, about $0.0002 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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