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/obolnetwork/obol-stack/building-blocksnpx skills add ObolNetwork/obol-stack --skill building-blocksgit clone --depth 1 https://github.com/ObolNetwork/obol-stackWhat 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 | $0.00105 | $0.03074 |
| Opus 5 | $0.00053 | $0.01537 |
| Sonnet 5 | $0.00021 | $0.00615 |
| Haiku 4.5 | $0.00011 | $0.00307 |
Grade A, and why
building-blocks 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 2d 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 — 245 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Building Blocks (DeFi Legos)
What You Probably Got Wrong
DeFi TVL: Ethereum DeFi TVL is $50B+ (Feb 2026). If you're quoting numbers from 2023-2024, they're stale.
Uniswap V4 is live. Launched mainnet January 31, 2025 on 10+ chains. V4 introduced a hooks system — custom logic attached to pools (dynamic fees, TWAMM, limit orders, custom oracles). This is the biggest composability upgrade since flash loans. PoolManager addresses are different per chain (NOT deterministic like V3).
Costs changed everything: A flash loan arbitrage on mainnet costs ~$0.05-0.50 in gas now (was $5-50). This opens composability patterns that were previously uneconomical.
The dominant DEX on each L2 is NOT Uniswap. Aerodrome and Velodrome merged into Aero (November 2025, Dromos Labs) — the unified DEX dominates both Base and Optimism. Camelot is a major native DEX on Arbitrum. Don't default to Uniswap on every chain.
Key Protocol Addresses (Verified Feb 2026)
| Protocol | Contract | Mainnet Address |
|---|---|---|
| Uniswap V2 Router | Router | 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D |
| Uniswap V2 Factory | Factory | 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f |
| Uniswap V3 Factory | Factory | 0x1F98431c8aD98523631AE4a59f267346ea31F984 |
| Uniswap V3 SwapRouter02 | Router | 0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45 |
| Uniswap V4 PoolManager | PoolManager | 0x000000000004444c5dc75cB358380D2e3dE08A90 |
| Uniswap Universal Router (V4) | Router | 0x66a9893cc07d91d95644aedd05d03f95e1dba8af |
| Aave V3 Pool | Pool | 0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2 |
See addresses/SKILL.md for complete multi-chain address list including L2-native protocols (Aerodrome, GMX, Pendle, Velodrome, Camelot, SyncSwap, Morpho).
Uniswap V4 Hooks (New)
Hooks let you add custom logic that runs before/after swaps, liquidity changes, and donations. This is the biggest composability upgrade since flash loans.
Hook Interface (Solidity)
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.
- 2d ago First seen · 245 lines · 105 tokens per session scan A 24d8cdbccdfd
building-blocks is a skill published in the GitHub repository ObolNetwork/obol-stack (11 stars, last pushed 3d ago), licensed Apache-2.0. It adds 105 tokens to every session and 3,074 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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