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 arunveersingh/ai --skill day-12-same-source-twicegit clone --depth 1 https://github.com/arunveersingh/aiWrote 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/arunveersingh/ai/day-12-same-source-twice)<a href="https://agentmods.dev/skills/arunveersingh/ai/day-12-same-source-twice"><img src="https://agentmods.dev/badge/skills/arunveersingh/ai/day-12-same-source-twice/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/arunveersingh/ai/day-12-same-source-twice"><img src="https://agentmods.dev/badge/skills/arunveersingh/ai/day-12-same-source-twice.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 | $0.00093 | $0.00785 |
| Opus 5.5 | $0.00037 | $0.00314 |
| Sonnet 5.5 | $0.00019 | $0.00157 |
| Haiku 4.5 | $0.00009 | $0.00078 |
Grade A, and why
same-source-twice 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 11d 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.
How it starts
The opening of the file, as written. The whole thing — 47 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Same source twice
A payout integration assumes "amount is in minor units, divide by 100". Three sources agree: the payouts page ("e.g. 1000 = 10.00 EUR"), the SDK docstring, the integration guide. All three copy the payouts page; the Currencies page listing zero-decimal currencies was never cited. When JPY is enabled later, 5,000 yen arrives as amount: 5000 and is booked as 50 yen, and every JPY payout is booked at 1/100.
Copied is not corroborated. Same origin, one vote; and one vote must come from the real system.
Part A — Ask (paste after your ticket)
For each premise, list its sources as: ref | origin | doc or system.
Origin is the page or system the text or value first came from, not where you read it.
Mark critical any premise that decides an amount, a destination or a deletion.
A critical premise is confirmed only with two different origins, one of them system output
(a sandbox call, a recorded response or a query) on the case most likely to differ.
If the system can't be checked safely, say so and name who must accept the risk.
Until then, don't start tasks that need it. Reply:
BLOCKED: critical premise has one origin | found: <premise, sources, origin> | need: <the system check>
In an orchestrated flow (spec → plan → tasks → implement): add origin and doc/system columns to the premise table in the plan; mark critical premises in the spec; make the system check a small first task and save its output next to the plan.
Part B — Check (you do this)
corroborate.py has no dependencies. Put the premises in JSON (see plan.example.json):
python3 corroborate.py plan.json # every premise
python3 corroborate.py plan.json P1 # one; exit 0 passes, 1 blocked or unknown id
On the example: P1: BLOCKED: critical premise has one origin | found: P1: 3 source(s), origin: payouts page | need: a source with a different origin. Add one system source (a sandbox JPY payout) and P1 passes. If the system can't be checked safely, "risk_accepted_by": "<name>" records who accepted the risk.
What ships with it
2 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.
- 11d ago First seen · 47 lines · 93 tokens per session scan A 7b4b525d8374
same-source-twice is a skill published in the GitHub repository arunveersingh/ai (3 stars, last pushed 3d ago), licensed Apache-2.0. It adds 93 tokens to every session and 785 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-10-14.
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