inspect

A pair of read-only tools for examining blockchain transaction data and addresses. Blockchain calldata is the encoded instruction sent with a transaction, while a contract is an address containing executable blockchain code.

In plain words
What is it for?
It is for decoding transaction instructions and signatures, unpacking Safe batch transactions, checking whether an address is a wallet or contract, inspecting tokens and proxies, and resolving ENS or Basename names.
Why use it?
It helps you understand an unfamiliar transaction or check an address before signing, approving, or sending money.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/obolnetwork/obol-stack/inspect
Any agent
npx skills add ObolNetwork/obol-stack --skill inspect
Clone the repo
git clone --depth 1 https://github.com/ObolNetwork/obol-stack

Made for: Claude Code, Codex.

Per session 107 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,305 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00107 $0.02305
Opus 5 $0.00053 $0.01153
Sonnet 5 $0.00021 $0.00461
Haiku 4.5 $0.00011 $0.00231

Measured yesterday against content hash e41cf969e975, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

inspect scanned grade A with 1 finding 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 yesterday.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/contract.py, scripts/decode.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

metadata: { "openclaw": { "emoji": "🔎", "requires": { "bins": ["python3", "cast", "curl"] } } }
internal/embed/skills/inspect/SKILL.md · 157 lines

How it starts

The opening of the file, as written. The whole thing — 157 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Inspect

Decode before you sign. Vet before you pay. Two read-only tools for the moment right before money or authority leaves the wallet:

  • scripts/decode.py — what does this calldata / transaction DO?
  • scripts/contract.py — who or what is this address, really?

When to Use

  • About to sign unfamiliar calldata or an EIP-712 payload (e.g. the Permit2 approval printed by buy-x402) — decode.py calldata
  • Reviewing a transaction someone sent, or auditing one you already sent — decode.py tx <hash>
  • About to pay a new or unknown x402 seller — contract.py check <payTo>
  • Vetting a counterparty token or contract before approving/holding it — contract.py check <token> (source verified? proxy? labeled?)
  • Deciding whether an address is a wallet or code — contract.py code (detects EIP-7702 delegated EOAs)
  • Turning an ENS/Basename into an address (or back) — contract.py resolve

When NOT to Use

  • Making the actual payment — use buy-x402
  • Generic RPC reads (balances, blocks, logs) — use ethereum-networks
  • Signing or sending transactions — use ethereum-local-wallet
  • Discovering sellers on the ERC-8004 registry — use discovery

Quick Start

# What am I about to sign? (ERC-20 selectors decode fully offline)
python3 ${OBOL_SKILLS_DIR:-/data/.openclaw/skills}/inspect/scripts/decode.py calldata \
    0xa9059cbb000000000000000000000000ab5801a7d398351b8be11c439e05c5b3259aec9b00000000000000000000000000000000000000000000000000000000000f4240
# selector: 0xa9059cbb
# function: transfer(address,uint256)
#   address: 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B
#   uint256: 1000000 [1e6]

# Who am I about to pay? Composite due-diligence on the payTo address.
python3 ${OBOL_SKILLS_DIR:-/data/.openclaw/skills}/inspect/scripts/contract.py check \
    0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 --network mainnet
# -> code / proxy / verified source / labels / ENS+Basename sections

# What did this transaction do?
python3 ${OBOL_SKILLS_DIR:-/data/.openclaw/skills}/inspect/scripts/decode.py tx \
    0xa2b4273e... --network mainnet

Read the full file on GitHub · 157 lines

Files

What ships with it

3 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.

Changes

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.

  1. yesterday First seen · 157 lines · 107 tokens per session scan A e41cf969e975

Subscribe to this mod's changes

inspect is a skill published in the GitHub repository ObolNetwork/obol-stack (11 stars, last pushed 2d ago), licensed Apache-2.0. It adds 107 tokens to every session and 2,305 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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