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 PlamenTSV/plamen --skill light-client-proof-verificationgit clone --depth 1 https://github.com/PlamenTSV/plamenWrote 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/plamentsv/plamen/light-client-proof-verification)<a href="https://agentmods.dev/skills/plamentsv/plamen/light-client-proof-verification"><img src="https://agentmods.dev/badge/skills/plamentsv/plamen/light-client-proof-verification/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/plamentsv/plamen/light-client-proof-verification"><img src="https://agentmods.dev/badge/skills/plamentsv/plamen/light-client-proof-verification.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 | $0.00043 | $0.03037 |
| Opus 5 | $0.00022 | $0.01519 |
| Sonnet 5 | $0.00009 | $0.00607 |
| Haiku 4.5 | $0.00004 | $0.00304 |
Grade A, and why
light-client-proof-verification 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 6d 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 — 183 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Injectable Skill: Light Client Proof Verification
L1 trigger:
L1_PATTERN=trueAND (light_client/ORics23/ORmerkle/ORproof/ORverify_proofORverify_rootORvalidate_pathORmerkle_treeORstate_rootORtrie_proofORibc/ORbeacon-api-client/detected in recon subsystem map) Inject Into:depth-consensus-invariantordepth-externalLanguage: Go and Rust Finding prefix:[LC-N]Status: v0.1 draft, Round 4 exemplars pending
Orchestrator Decomposition Guide
- Sections 1, 2: depth-consensus-invariant (proof soundness)
- Section 3: depth-external (cross-chain assumptions)
- Section 4: depth-edge-case (boundary + adversarial inputs)
When This Skill Activates
Recon identifies light-client or cross-chain proof verification code. This skill is the most consequential for cross-chain bridges and IBC-adjacent code because a proof-verification bug can allow forged state to be accepted as canonical — the Dragonberry class.
1. Proof Format Fingerprinting
Identify the exact proof format used:
| Format | Identifier | Notable pitfalls |
|---|---|---|
| Merkle-Patricia Trie (MPT) | Ethereum state proofs, eth_getProof |
RLP decode edge cases; extension/branch collision |
| IAVL+ | Cosmos SDK x/store |
Left-right ordering; ICS-23 subkey encoding |
| Sparse Merkle Tree (SMT) | Aptos, Sui, Celestia | Empty-leaf handling; default hash values |
| Verkle | Future Ethereum | KZG commitment; opening soundness |
| SSZ proofs | Ethereum Beacon chain | Generalized index encoding |
| ICS-23 | IBC light clients | Generic proof spec; multiple backends |
Write the format into the finding header.
2. Soundness Checks Per Format
2a. Merkle-Patricia Trie (Ethereum state proof)
- RLP decode strictness: does the decoder reject non-canonical RLP encodings? Leading zeros, empty-byte integers, overlong encodings?
- Hash pre-image check: the proof path hashes must chain correctly from leaf to root
- Key encoding: the MPT key is nibbled (4-bit). Off-by-one in nibble-decoding is a classic bug class.
- Leaf vs extension vs branch disambiguation: node type encoded in first byte of value; must be checked before use
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.
- 6d ago First seen · 183 lines · 43 tokens per session scan A 2949a0d3d3b3
light-client-proof-verification is a skill published in the GitHub repository PlamenTSV/plamen (295 stars, last pushed 2d ago), licensed MIT. It adds 43 tokens to every session and 3,037 once invoked, about $0.0002 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 2026-09-03.
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