--- name: quicknode-core-workflow-a-181aa10b9d7c description: 'Design a safe EVM transaction-submission path over QuickNode with simulation, fee and nonce policy, signer isolation, broadcast identity, and confirmation rules. Use when moving a read-only integration into transaction writes. Trigger with: "send transactions through QuickNode", "build an EVM write path", "harden QuickNode transaction submission".' allowed-tools: Read, Grep, Write, Edit version: 2.0.0 argument-hint: '[chain-network-and-write-operation]' model: inherit effort: high license: MIT author: Jeremy Longshore tags: - saas - quicknode - ethereum - transactions - reliability compatibility: 'EVM method availability, fee fields, and finality rules vary by chain and network' --- # QuickNode EVM Transaction Safety ## Overview Build a write path that treats signing, submission, and confirmation as separate state transitions. QuickNode transports the signed transaction; the application remains responsible for intent, signer custody, nonce coordination, chain identity, and reorganization policy. ## Prerequisites - A verified QuickNode endpoint and expected EVM chain ID - A testnet signer held outside source code - Contract ABI, write intent, value ceiling, and confirmation policy ## Instructions ### Step 1: Inspect the existing path Use Read and Grep to find signers, private-key variables, nonce overrides, fee logic, retries, and receipt assumptions. Stop if secrets or signed raw transactions are logged. ### Step 2: Define transaction intent Use Write or Edit to express destination, calldata, value, chain ID, and caller policy as validated inputs. Reject unexpected networks and unbounded value before reaching the signer. ### Step 3: Simulate and estimate Run the equivalent read call and gas estimate at an explicit block tag when supported. Treat a revert as an application or chain-state result, not a transient provider failure. ### Step 4: Coordinate nonce and fees Assign one nonce owner per signer. Read pending nonce state, define replacement rules, and use chain-appropriate fee fields. Do not blindly overwrite a nonce or double fees on each timeout. ### Step 5: Sign and broadcast once Keep signing in a wallet, HSM, or approved remote signer. Persist the signed transaction hash before submission. On an ambiguous timeout, query by hash before broadcasting again. ### Step 6: Confirm by policy Track inclusion, receipt status, block hash, and the required chain-specific confirmation depth. Reconcile dropped or reorganized receipts and expose a durable business-operation idempotency key. ## Tool Discipline Use Read and Grep for transaction-path discovery and Write/Edit for validation, state-machine, and tests. This skill never asks the agent to hold a private key or execute a funded transaction. ## Output - Validated transaction-intent schema - Signer, nonce, fee, and broadcast ownership contract - Ambiguous-submission reconciliation path - Chain-specific confirmation and reorg policy ## Examples A payment request is recorded before signing. If broadcast times out, the worker searches for the known transaction hash and never manufactures a second payment from the same business request. ## Error Handling | Failure | Response | | --- | --- | | Simulation reverts | Decode against ABI and state; do not retry automatically | | Nonce too low | Reconcile pending and mined transactions for the signer | | Broadcast timeout | Query the persisted hash before deciding whether to resubmit | | Receipt disappears | Return to pending and apply the documented reorg policy | ## Resources - [Transaction-safety evidence and source notes](references/official-docs.md) - [Ethereum API overview](https://www.quicknode.com/docs/ethereum/api-overview) - [QuickNode Ethereum methods](https://www.quicknode.com/docs/ethereum) --- Source attribution: jeremylongshore Original project: https://github.com/jeremylongshore/claude-code-plugins-plus-skills/blob/ab85a061f7bcc039dac13ee193de7a4cd4388571/plugins/saas-packs/quicknode-pack/skills/quicknode-core-workflow-a/SKILL.md License: MIT License information: https://opensource.org/license/mit Original upstream instructions; downloaded from Mega AI Hub. ## Upstream license notice MIT License Copyright (c) 2025 Jeremy Longshore Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # Mega AI Hub resource metadata Creator / publisher: jeremylongshore Original project: https://github.com/jeremylongshore/claude-code-plugins-plus-skills/blob/ab85a061f7bcc039dac13ee193de7a4cd4388571/plugins/saas-packs/quicknode-pack/skills/quicknode-core-workflow-a/SKILL.md Attribution basis: Source repository record Fields of work: Development & Engineering, Product Management Roles: Backend Developer, ML / AI Engineer, Product Manager Specialties: API, Design, Word Documents, Frontend, Testing Tools: Quicknode, Ethers.Js Country applicability: Country not specified Classification basis: Source catalog labels Instruction SHA-256: b2127d070ff213dfef80936bc63f0f2d7be1b8dba0509d5c266b016839a41b66