validation-mcp-server
validation-mcp-server is an offline, Python-based Model Context Protocol (MCP) server that provides Ethereum address/key validation and related cryptographic utilities (e.g., EIP-55 checksum validation, private-key range checking, checksummed conversion, signature component/value validation, hashing like keccak256, function selector encoding/decoding, ENS format validation, and storage-slot computation).
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Strengths (from provided content): designed for offline/no network calls and does not persist keys (“keys are passed through, never persisted”). Primary risk: it manipulates sensitive cryptographic material; misuse (e.g., logging inputs/outputs containing private keys) must be avoided by agent/operator. No details are provided on secure logging, redaction, or operational deployment hardening. Dependency posture is not verifiable from provided content; score assumes typical library hygiene but cannot confirm CVE status.
⚡ Reliability
Best When
You need deterministic, offline Ethereum validation and cryptographic helpers to support AI-assisted security checks (e.g., before signing transactions/messages) in an air-gapped or network-restricted environment.
Avoid When
You need authenticated network services, webhooks, or managed API access; or you require documented rate limits and operational SLAs (not evidenced in provided content).
Use Cases
- • Validate Ethereum addresses (including EIP-55 checksum)
- • Derive addresses from private/public keys (for verification workflows)
- • Validate private keys for range correctness
- • Validate ECDSA signature components (v/r/s) without broadcasting transactions
- • Compute keccak256 hashes and function selectors offline
- • Validate ENS name format and compute EVM storage slot positions
- • Batch validate multiple addresses
- • Assist AI agents in constructing safe offline workflows around signing/verification tooling
Not For
- • Generating or managing real funds without a broader wallet/transaction toolchain
- • Storing or persisting secrets (the server is described as passing keys through; avoid using it as a secrets vault)
- • Production signing workflows that require audited operational guarantees beyond library correctness (no runtime/SLA guarantees are shown here)
Interface
Authentication
The provided README focuses on local/CLI MCP usage (Claude Desktop config). No auth mechanism (API keys/OAuth scopes) is documented for the MCP server.
Pricing
No pricing information provided; repo appears to be MIT-licensed open source tooling.
Agent Metadata
Known Gotchas
- ⚠ Input validation is likely strict for hex/address formats; agents may need to normalize 0x-prefix/casing and provide correct hex lengths.
- ⚠ Signature validation expects correct v/r/s semantics; agents may need to supply v in the expected normalization (e.g., 27/28 vs 0/1) depending on tool requirements.
- ⚠ Batch tools may have limits on batch size (not specified in provided content).
- ⚠ The MCP server is offline-focused; agents expecting network lookups (e.g., ENS resolution) may need to restrict themselves to format validation only (ENS format validation is mentioned, not resolution).
Alternatives
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Scores are editorial opinions as of 2026-04-04.