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 claude-dev-suite/claude-dev-suite --skill babylongit clone --depth 1 https://github.com/claude-dev-suite/claude-dev-suiteWrote 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/claude-dev-suite/claude-dev-suite/babylon)<a href="https://agentmods.dev/skills/claude-dev-suite/claude-dev-suite/babylon"><img src="https://agentmods.dev/badge/skills/claude-dev-suite/claude-dev-suite/babylon/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/claude-dev-suite/claude-dev-suite/babylon"><img src="https://agentmods.dev/badge/skills/claude-dev-suite/claude-dev-suite/babylon.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00070 | $0.02099 |
| Opus 5.5 | $0.00028 | $0.00840 |
| Sonnet 5.5 | $0.00014 | $0.00420 |
| Haiku 4.5 | $0.00007 | $0.00210 |
Grade A, and why
bitcoin-l2-babylon 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 1mo 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 — 177 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Babylon
Bitcoin staking protocol — let BTC holders stake BTC to secure external Proof-of-Stake systems (Cosmos chains, L2s, DA layers) without bridging or wrapping.
Backed by Babylon Labs. Babylon Genesis mainnet live since April 2025. Trustless Bitcoin Vaults were announced on BitVM3 in August 2025; as of September 2026 they are on public testnet only and the shipped protocol verifies redemption with BABE, not BitVM3.
Architecture
- Native BTC staking: BTC stays on Bitcoin chain in special staking output.
- Slashable security: misbehavior on PoS chain → slash via pre-signed slashing tx.
- No custody: no third party holds the BTC.
- Self-custodial: stakers control their keys.
Mechanism
1. BTC holder locks BTC in a Bitcoin staking output (specialized script).
2. Holder signs (off-chain) attestations for blocks on a PoS chain.
3. PoS chain rewards BTC stakers (in PoS chain's native token).
4. If staker double-signs / equivocates → pre-signed slashing tx
spendable, BTC slashed from staking output.
Key: BTC never leaves Bitcoin. Slashing path enforced via Bitcoin script (CSV + spending conditions).
Trustless Bitcoin Vaults (TBV)
History. The 6 August 2025 announcement pitched BitVM3-based vaults that would let BTC flow into BTC-secured PoS systems without a custodian. Both the mechanism and the scope changed before anything shipped — do not quote the 2025 framing as current.
Status, 16 September 2026. Public testnet only: Bitcoin signet
plus Ethereum testnet, with mock Sepolia borrow assets and no monetary
value. docs.babylonlabs.io fronts the whole site with "Public
testnet live". The 7 October 2025 vault-first roadmap post targeted
vault mainnet for "early next year"; that has not landed.
Mechanism. Redemption is verified with BABE, not BitVM3. BABE ("Verifying Proofs on Bitcoin Made 1000x Cheaper", Garg, Kolonelos, Sergeevitch, Sridhar, Tse — January 2026) keeps BitVM3's on-chain cost while cutting off-chain storage and setup by three orders of magnitude; BitVM3 needs ~42 GiB per garbled circuit. It pairs a witness-encryption scheme for linear pairing relations with a garbled circuit for EC scalar multiplication, making Groth16 verification practical in existing Bitcoin script. No fork required.
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.
- 1mo ago Changed · +85 lines · +5 tokens per session 66541f1e401f
- 1mo ago First seen · 92 lines · 65 tokens per session scan A ecdc04080db2
bitcoin-l2-babylon is a skill published in the GitHub repository claude-dev-suite/claude-dev-suite (42 stars, last pushed 5d ago), licensed MIT. It adds 70 tokens to every session and 2,099 once invoked, about $0.0003 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 2026-09-03.
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