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Agent skill

Alchemy Local Dev Loop

by jeremylongshore in jeremylongshore/tons-of-skills-marketplace

Establish a deterministic local EVM development loop with pinned forks, synthetic fixtures, and bounded Alchemy usage.

MITAuto-check: notesBackend & APIs

Install Alchemy Local Dev Loop

skills CLI
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill alchemy-local-dev-loop -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install jeremylongshore/tons-of-skills-marketplace alchemy-local-dev-loop --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/alchemy-local-dev-loop .claude/skills/alchemy-local-dev-loop && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
alchemy-local-dev-loop
GitHub stars
2.8k
Token cost
~1.2k tokens
SKILL.md length
552 words
Files
2 (incl. references)
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Establish a deterministic local EVM development loop with pinned forks, synthetic fixtures, and bounded Alchemy usage.

  • Works in 6 steps: Inventory the project's current Hardhat,… → Confirm the target chain and historical… → Inject a development Alchemy endpoint… → …
  • Adding local chain tests
  • SKILL.md covers Overview, Prerequisites, Current Contract and Authentication, plus 8 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Alchemy Local Dev Loop is an agent skill from jeremylongshore/tons-of-skills-marketplace. Establish a deterministic local EVM development loop with pinned forks, synthetic fixtures, and bounded Alchemy usage. Use when adding local chain tests or repairing flaky fork-based development. Trigger with "Alchemy local dev", "Hardhat fork with Alchemy", or "pin a mainnet fork".

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/official-docs.md`). Compatibility notes: Designed for Claude Code; live Alchemy access requires network access, an appropriate credential, account capacity, and explicit approval

It sits in Backend & APIs, covering Smart contracts. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.

When your agent uses it

  • Adding local chain tests
  • Repairing flaky fork-based development
  • With Alchemy local dev
  • Hardhat fork with Alchemy

Example prompts

  • “Alchemy local dev”
  • “Hardhat fork with Alchemy”
  • “pin a mainnet fork”
  • “/alchemy-local-dev-loop”

Requirements

  • Compatibility (from SKILL.md): Designed for Claude Code; live Alchemy access requires network access, an appropriate credential, account capacity, and explicit approval
  • Pre-approved tools (allowed-tools): Read, Glob, Grep, Write, Edit

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Inventory the project's current Hardhat, Foundry, Anvil, or other EVM test runner and preserve its existing commands.
  2. Confirm the target chain and historical method support, then select and record a stable fork block with the business reason for changing it.
  3. Inject a development Alchemy endpoint through the established local secret mechanism and ensure configuration fails clearly when it is…
  4. Use synthetic accounts and deterministic impersonation or funded fixtures; never import a real user or production signer.
  5. Run the smallest fork test, a clean-room rerun, and an offline/unit fallback; record request volume and wall time without claiming a…
  6. Document how to advance the fork block, refresh fixtures, distinguish provider drift from code failure, and restore the prior block.

What it can do on your machine

Read from SKILL.md and the folder at commit 80f86df. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Glob
    • Grep
    • Write
    • Edit

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    Designed for Claude Code; live Alchemy access requires network access, an appropriate credential, account capacity, and explicit approval

    From compatibility in the SKILL.md frontmatter.

Context cost

Alchemy Local Dev Loop loads about 1.2k tokens when it runs, and up to ~2k if it reads all its reference files. Until then it costs about 77 tokens; SKILL.md has 552 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~77
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NoteMentions a .env fileSKILL.md:33
    uction key or deployer private key into `.env`, task output, shell history, fixtures, or committed fork URLs.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from jeremylongshore/tons-of-skills-marketplace at commit 80f86df, republished under its MIT licence (© jeremylongshore). 552 words, ~1,224 tokens.

Download SKILL.mdSave it as .claude/skills/alchemy-local-dev-loop/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
alchemy-local-dev-loop
description
Establish a deterministic local EVM development loop with pinned forks, synthetic fixtures, and bounded Alchemy usage. Use when adding local chain tests or repairing flaky fork-based development. Trigger with "Alchemy local dev", "Hardhat fork with Alchemy", or "pin a mainnet fork".
allowed-tools
Read, Glob, Grep, Write, Edit
compatibility
Designed for Claude Code; live Alchemy access requires network access, an appropriate credential, account capacity, and explicit approval
argument-hint
<framework> <chain> <fork-block>
version
2.0.0
license
MIT
author
Jeremy Longshore <jeremy@intentsolutions.io>
tags
saas, alchemy, testing, hardhat
model
inherit
effort
high

Alchemy Deterministic Local Development Loop

Overview

Establish a deterministic local EVM development loop with pinned forks, synthetic fixtures, and bounded Alchemy usage. This workflow produces a reviewable artifact and negative-path evidence before any live side effect.

Prerequisites

  • Current first-party Alchemy documentation for the selected product, chain, feature, client, authentication method, limit, and lifecycle.
  • Named product, application, security, data/privacy, budget, release, and operations owners appropriate to the requested scope.
  • Synthetic or approved non-production fixtures, a credential canary, explicit success criteria, and a tested rollback boundary.

Current Contract

A remote mainnet fork is reproducible only when the chain, block number, dependency versions, and fixture state are pinned. It still consumes account-level throughput and can diverge when historical access, method support, or upstream state is unavailable. Alchemy Sandbox is a separate simulation option and must be evaluated against the required test semantics.

Authentication

Use a development-only app key from local secret injection. Never copy a production key or deployer private key into .env, task output, shell history, fixtures, or committed fork URLs.

Instructions

  1. Inventory the project's current Hardhat, Foundry, Anvil, or other EVM test runner and preserve its existing commands.
  2. Confirm the target chain and historical method support, then select and record a stable fork block with the business reason for changing it.
  3. Inject a development Alchemy endpoint through the established local secret mechanism and ensure configuration fails clearly when it is absent.
  4. Use synthetic accounts and deterministic impersonation or funded fixtures; never import a real user or production signer.
  5. Run the smallest fork test, a clean-room rerun, and an offline/unit fallback; record request volume and wall time without claiming a universal benchmark.
  6. Document how to advance the fork block, refresh fixtures, distinguish provider drift from code failure, and restore the prior block.

Tool Discipline

Use Read, Glob, and Grep to inspect current documentation, configuration, code, fixtures, and evidence. Use Write and Edit only for approved repository artifacts. Skill invocation alone does not authorize network access, credentials, wallet addresses, customer data, plan changes, spend, key creation or rotation, webhook changes, deployment, replay, transaction construction, signing, broadcast, or deletion.

Show full SKILL.md (201 more words)Show less

Approval Boundaries

The test owner approves the pinned state and fixture refresh. Security approves secret injection. Forking production state, using customer addresses, or funding a test signer requires data/security approval.

Error Handling

  • A latest-block fork that passes once is not deterministic evidence.
  • If the historical block or method is unavailable, stop and classify the provider/test assumption rather than silently changing the block.
  • A leaked endpoint is a credential incident even when the key is development-only.

Output

Return the pinned chain/block/dependency matrix, redacted local configuration, deterministic fixtures, positive and clean-room test receipts, usage observation, drift procedure, and rollback. Mark assumptions, observations, source dates, environment-specific behavior, owners, and unresolved gaps explicitly.

Examples

  • Pin an Ethereum fork to the block needed by a contract regression and prove the same result in two clean runs.
  • Compare a fork test with Alchemy Sandbox only after documenting which state mutation and tracing behavior the test requires.

Validation

Exercise and record expected and observed results for:

  • missing endpoint
  • wrong chain ID
  • unpinned block rejected
  • fixture reset
  • provider timeout
  • offline/unit fallback

Resources

  • Current first-party evidence map — recheck dated Alchemy sources before execution.
  • Treat observed account, application, network, indexer, chain, or provider behavior as environment-specific evidence, never a universal guarantee.

© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in skills/.curated/alchemy-local-dev-loop of jeremylongshore/tons-of-skills-marketplace.

  • SKILL.md
  • references/official-docs.md

Open the folder on GitHubat commit 80f86df

Compare with similar skills

Alchemy Local Dev Loop next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Alchemy Local Dev Loop compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Alchemy Local Dev Loop this skilljeremylongshore/tons-of-skills-marketplace2.8k—~1.2kAutomated safety check: NotesMIT
Fizz Convertpashov/skills1.2k2 repos~3.7kAutomated safety check: PassMIT
Solana Devsolana-foundation/solana-dev-skill574—~3.8kAutomated safety check: PassMIT
Feynman Auditor0xiehnnkta/nemesis-auditor2431 repos~11kAutomated safety check: PassMIT
Smart Contract Auditgreatpie/smart-contract-audit-skill101—~1.1kAutomated safety check: PassNone
RadarAuditware/radar154—~2.1kAutomated safety check: PassGPL-3.0

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Categories

Questions about Alchemy Local Dev Loop

What does Alchemy Local Dev Loop do?

Establish a deterministic local EVM development loop with pinned forks, synthetic fixtures, and bounded Alchemy usage. Alchemy Local Dev Loop is an agent skill from jeremylongshore/tons-of-skills-marketplace. Establish a deterministic local EVM development loop with pinned forks, synthetic fixtures, and bounded Alchemy usage.

When should I use Alchemy Local Dev Loop?

Alchemy Local Dev Loop fits situations like: adding local chain tests; repairing flaky fork-based development; with Alchemy local dev; hardhat fork with Alchemy.

How do I install Alchemy Local Dev Loop in Claude Code?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill alchemy-local-dev-loop -a claude-code`. Or copy the skill folder (skills/.curated/alchemy-local-dev-loop in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/alchemy-local-dev-loop in your project. Claude Code loads it when a task matches its description.

How do I install Alchemy Local Dev Loop in Codex?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill alchemy-local-dev-loop -a codex`. Or copy the skill folder (skills/.curated/alchemy-local-dev-loop in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/alchemy-local-dev-loop in your project. Codex loads it when a task matches its description.

Can I use Alchemy Local Dev Loop in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill alchemy-local-dev-loop -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/alchemy-local-dev-loop, .gemini/skills/alchemy-local-dev-loop, .github/skills/alchemy-local-dev-loop and .opencode/skills/alchemy-local-dev-loop in your project.

What does Alchemy Local Dev Loop need to run?

SKILL.md names no scripts, command-line tools or credentials: Alchemy Local Dev Loop is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Glob, Grep, Write, Edit. Compatibility (from SKILL.md): Designed for Claude Code; live Alchemy access requires network access, an appropriate credential, account capacity, and explicit approval.

Does Alchemy Local Dev Loop access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Alchemy Local Dev Loop safe to install?

Our automated static check of SKILL.md found notes only (mentions a .env file), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Alchemy Local Dev Loop use?

Alchemy Local Dev Loop is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Alchemy Local Dev Loop use?

About 1.2k tokens (SKILL.md is roughly 4.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 754 tokens, read only when the agent opens those files.

What are the alternatives to Alchemy Local Dev Loop?

Skills that share tags, products or a category with Alchemy Local Dev Loop: Fizz Convert (pashov/skills, 1.2k stars), Solana Dev (solana-foundation/solana-dev-skill, 574 stars), Feynman Auditor (0xiehnnkta/nemesis-auditor, 243 stars) and Smart Contract Audit (greatpie/smart-contract-audit-skill, 101 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Alchemy Local Dev Loop?

jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,825 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 9, 2026.

Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.