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BF eth-readonly

Read-only Ethereum blockchain queries — blocks, transactions, balances, contracts, logs via RPC and Etherscan APIs

modbender/skill-library-mcp Agent Skills author: modbender MIT 1 file body ≈ 1 947 tokens Open the sourcegithub.com↗ analyzed 2 d ago

Read-only Ethereum blockchain queries — blocks, transactions, balances, contracts, logs via RPC and Etherscan APIs

As a process F 33/100 · Will not run — weak spots: steps, result and completion, when it triggers

IntegrationSoftware developmenttype and topics are labelled automatically from the skill text
Runs in: OpenClaw Claude / Claude Code ChatGPT / Codex Gemini CLI Cursor GitHub Copilot / VS Code Qwen Code Kimi Code CLI Z.ai (GLM) DeepSeek (Deep Code) Mistral Vibe LangChain (deepagents) Goose OpenCode
JSON
Technical rating
B
76/100
safety, quality, tests
Safety 60%
85
Quality 40%
63
Run on models
none yet
Process rating
F
33/100
Will not run
Steps w 15
0
Result and completion w 14
0
Inputs and preconditions w 11
0
the three weakest of ten parameters · all ten

How to improve

  1. Say in the description WHEN to use the skill ("use when…", example requests): that is the agent's main cue.
For the model run — optional
  • Your own cases (evals/evals.json, 4–6 real requests with expected answers): the full check would then run those instead of a model-drafted suite.
  • A spec.yaml with trigger phrases and assertions — a behaviour contract for CI; `skilltest init` writes a template.

Guard findings · 15

✓ No critical or high findings

Medium and low: 15
  • low Secrets in code secret-high-entropy-token SKILL.md:101
    High-entropy token-like string (may be an id, hash or a credential)
    cast balance 0xd8…045 --rpc-url $ETH_RPC_URL
  • low Secrets in code secret-high-entropy-token SKILL.md:107
    High-entropy token-like string (may be an id, hash or a credential)
    cast code 0xA0…5E3 --rpc-url $ETH_RPC_URL  # USDC
  • low Secrets in code secret-high-entropy-token SKILL.md:111
    High-entropy token-like string (may be an id, hash or a credential)
    cast lookup-address 0xd8…045 --rpc-url $ETH_RPC_URL
  • low Secrets in code secret-high-entropy-token SKILL.md:124
    High-entropy token-like string (may be an id, hash or a credential) (quoted — discussed, not commanded)
    -d '{"jsonrpc":"2.0","method":"eth_getBalance","params":["0xd8…045","latest"],"id":1}'
    quoted
  • low Exfiltration exfil-secret-in-url SKILL.md:184
    Credential passed in a URL query string (normal for some APIs — verify the host is the intended service) (detector / deny-list definition; the skill's own vendor host)
    curl -s "https://api.etherscan.io/api?module=…&action=…&apikey=…" | jq '.result'
    detectorvendor-host
  • low Exfiltration net-credential-use SKILL.md:184
    Credential used in a network call (verify the destination is the intended service) (the skill's own vendor host)
    curl -s "https://api.etherscan.io/api?module=…&action=…&apikey=…" | jq '.result'
    vendor-host
  • low Secrets in code secret-high-entropy-token SKILL.md:197
    High-entropy token-like string (may be an id, hash or a credential)
    cast logs 0xA0…5E3 --from-block 19000000 --to-block 19001000 \
  • low Exfiltration exfil-secret-in-url SKILL.md:217
    Credential passed in a URL query string (normal for some APIs — verify the host is the intended service) (detector / deny-list definition; the skill's own vendor host)
    curl -s "https://api.etherscan.io/api?module=…&action=…&address=…&apikey=…" | jq '.result[0].SourceCode'
    detectorvendor-host
  • low Exfiltration net-credential-use SKILL.md:217
    Credential used in a network call (verify the destination is the intended service) (the skill's own vendor host)
    curl -s "https://api.etherscan.io/api?module=…&action=…&address=…&apikey=…" | jq '.result[0].SourceCode'
    vendor-host
  • low Exfiltration exfil-secret-in-url SKILL.md:220
    Credential passed in a URL query string (normal for some APIs — verify the host is the intended service) (the skill's own vendor host; quoted — discussed, not commanded)
    curl -s "https://api.etherscan.io/api?module=…&action=…&address=…&apikey=…"
    vendor-hostquoted
  • low Exfiltration net-credential-use SKILL.md:220
    Credential used in a network call (verify the destination is the intended service) (the skill's own vendor host)
    curl -s "https://api.etherscan.io/api?module=…&action=…&address=…&apikey=…"
    vendor-host
  • low Exfiltration exfil-secret-in-url SKILL.md:226
    Credential passed in a URL query string (normal for some APIs — verify the host is the intended service) (the skill's own vendor host; quoted — discussed, not commanded)
    curl -s "https://api.etherscan.io/api?module=…&action=…&address=…&startblock=0&endblock=…&page=1&offset=10&sort=desc&apikey=…
    vendor-hostquoted
  • low Exfiltration net-credential-use SKILL.md:226
    Credential used in a network call (verify the destination is the intended service) (the skill's own vendor host)
    curl -s "https://api.etherscan.io/api?module=…&action=…&address=…&startblock=0&endblock=…&page=1&offset=10&sort=desc&apikey=…
    vendor-host
  • low Exfiltration exfil-secret-in-url SKILL.md:229
    Credential passed in a URL query string (normal for some APIs — verify the host is the intended service) (the skill's own vendor host; quoted — discussed, not commanded)
    curl -s "https://api.etherscan.io/api?module=…&action=…&address=…&page=1&offset=10&sort=desc&apikey=…" | jq '.result[] | {tokenNam
    vendor-hostquoted
  • low Exfiltration net-credential-use SKILL.md:229
    Credential used in a network call (verify the destination is the intended service) (the skill's own vendor host)
    curl -s "https://api.etherscan.io/api?module=…&action=…&address=…&page=1&offset=10&sort=desc&apikey=…" | jq '.result[] | {tokenNam
    vendor-host

Files scanned: 1. Evidence is masked. Grey chips explain why severity was lowered.

Against the Agent Skills spec

  • warning description-no-when description does not say WHEN to use the skill (no "use when")
  • note frontmatter-key unknown frontmatter key "homepage"

Process rating: all ten parameters 33/100

  • 0Steps. Prose only: no discrete steps
  • 0Result and completion. Does not say what the result is
  • 0Inputs and preconditions. Does not say what the process needs to start
  • 0Failures and branches. Linear process with no failure handling
  • 20When it triggers. No condition that starts the skill
  • 60Tools and files. Uses tools (web) that frontmatter does not declare
  • 100Consistency. Name and required fields are in place
  • 100Execution cost. Instruction body is 1947 tokens
  • 100Running it twice. No mutating operations
  • 100Progress reporting. Reports progress
  • medium Safety rules and hard prohibitions inside a skill: they belong in the system prompt, here they protect nothing
  • low 10 top-level sections: this looks like several domains in one skill

Everything here is measured from the skill text rather than judged by a model, so the numbers are checkable. A parameter weighs more when it is a more common reason for the process to stall.

Quality signals

  • +5Description has no quoted example phrases that should trigger the skill
  • +4Description does not say when NOT to use the skill (false activations)
  • +3Description length 114: 120–800 characters recommended
  • +3No numbered steps or checklist
  • +3Output format is not stated: the model decides each time
  • -2localhost URLs: will not work for another user
  • +1No license
  • +2Single-language instructions
  • +4Structure: 20 headings
  • +4Has examples (24 code blocks)

Quality base 70; lint remarks subtract, signals add up to 100. Result: 63.