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Agent skill

Runway Local Dev Loop

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

Build and test a Runway integration locally with recorded contracts, deterministic task states, and an opt-in paid canary.

MITAuto-check passedDevOps & Cloud

Install Runway Local Dev Loop

skills CLI
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill runway-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 runway-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/runway-local-dev-loop .claude/skills/runway-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
runway-local-dev-loop
GitHub stars
2.8k
Token cost
~1.3k tokens
SKILL.md length
559 words
Files
2 (incl. references)
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Build and test a Runway integration locally with recorded contracts, deterministic task states, and an opt-in paid canary.

  • Works in 6 steps: Map the seam → Model the state machine → Separate clocks and network → …
  • Shortening iteration without duplicate spend
  • SKILL.md covers Overview, Prerequisites, Instructions and Authentication, plus 6 more sections
  • Needs RUNWAYML_API_SECRET

What it does

Runway Local Dev Loop is an agent skill from jeremylongshore/tons-of-skills-marketplace. Build and test a Runway integration locally with recorded contracts, deterministic task states, and an opt-in paid canary. Use when shortening iteration without duplicate spend. Trigger with: "develop Runway locally", "mock Runway tasks", "Runway dev loop".

Its SKILL.md is about 1.3k 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: Requires server-side Runway Dev access, current first-party documentation, an approved credit budget, and controlled media storage.

It sits in DevOps & Cloud, covering Deployment. 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

  • Shortening iteration without duplicate spend
  • With: develop Runway locally
  • Mock Runway tasks
  • Runway dev loop

Example prompts

  • “develop Runway locally”
  • “mock Runway tasks”
  • “Runway dev loop”
  • “/runway-local-dev-loop”

Requirements

  • A credential in RUNWAYML_API_SECRET
  • Compatibility (from SKILL.md): Requires server-side Runway Dev access, current first-party documentation, an approved credit budget, and controlled media storage.
  • Pre-approved tools (allowed-tools): Read, Grep, Write, Edit

Workflow steps

6 steps, taken from the step headings in SKILL.md.

  1. Map the seam
  2. Model the state machine
  3. Separate clocks and network
  4. Protect against duplicate work
  5. Test media boundaries
  6. Run an opt-in canary

What it can do on your machine

Read from SKILL.md and the folder at commit cfae287. 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
    • 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

    Links to these hosts (documentation or services it may open):

    • docs.dev.runwayml.com

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

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • RUNWAYML_API_SECRET

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

  • Compatibility

    Requires server-side Runway Dev access, current first-party documentation, an approved credit budget, and controlled media storage.

    From compatibility in the SKILL.md frontmatter.

Context cost

Runway Local Dev Loop loads about 1.3k tokens when it runs, and up to ~2.3k if it reads all its reference files. Until then it costs about 70 tokens; SKILL.md has 559 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~70
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2.3k

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 passed

The automated check found no risky patterns in SKILL.md.

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 cfae287, republished under its MIT licence (© jeremylongshore). 559 words, ~1,290 tokens.

Download SKILL.mdSave it as .claude/skills/runway-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
runway-local-dev-loop
description
Build and test a Runway integration locally with recorded contracts, deterministic task states, and an opt-in paid canary. Use when shortening iteration without duplicate spend. Trigger with: "develop Runway locally", "mock Runway tasks", "Runway dev loop".
allowed-tools
Read, Grep, Write, Edit
compatibility
Requires server-side Runway Dev access, current first-party documentation, an approved credit budget, and controlled media storage.
version
2.0.0
argument-hint
[service-or-test-path]
model
inherit
effort
high
license
MIT
author
Jeremy Longshore <jeremy@intentsolutions.io>
tags
saas, runway, local-development, fixtures, testing

Runway Offline-First Development Loop

Overview

Make routine development deterministic and non-billable. The local loop should model Runway's asynchronous protocol accurately, while a separately authorized canary detects provider drift without turning every test run into paid generation.

Prerequisites

  • A local service boundary that can replace the Runway client
  • Redacted fixtures for create, task states, HTTP errors, and task failures
  • A disabled-by-default credential path for an approved canary

Instructions

Step 1: Map the seam

Use Read and Grep to locate direct SDK calls, task persistence, output download code, retries, and cancellation. Introduce one provider interface if application code currently imports the SDK everywhere.

Step 2: Model the state machine

Create fixtures for PENDING, THROTTLED, RUNNING, SUCCEEDED, FAILED, and CANCELLED. Make only SUCCEEDED include output; make failed fixtures include a machine-readable failure code.

Step 3: Separate clocks and network

Inject polling time, jitter, timeout, and HTTP transport. Tests should advance a fake clock and never wait five real seconds or contact Runway.

Step 4: Protect against duplicate work

Persist an internal operation ID and provider task ID. Simulate a lost response after task creation and prove recovery reads the saved task rather than issuing another paid request.

Step 5: Test media boundaries

Use tiny synthetic files and fixtures for public URL, data URI, and runway:// input. Model auto-crop review, upload expiry, output expiry, and owned-storage copy without retaining real signed URLs.

Step 6: Run an opt-in canary

Require an explicit environment switch, safe prompt, model schema check, credit ceiling, and named approver. Keep CI and ordinary local commands on the fake provider.

Authentication

Fixtures contain no usable secrets. The optional canary reads RUNWAYML_API_SECRET only in the server process, uses the reviewed version header, and refuses to run when the opt-in approval variables are incomplete.

Tool Discipline

Use Read and Grep to inspect application configuration, provider documentation, lockfiles, fixtures, schemas, tests, and redacted operational evidence before proposing a change. Use Write or Edit only for an approved implementation, configuration, test, runbook, or redacted receipt. Do not create, cancel, delete, retry, deploy, rotate, revoke, publish, or otherwise mutate production Runway resources without explicit operator approval.

Show full SKILL.md (209 more words)Show less

Output

  • Replaceable Runway client interface and deterministic fixture set
  • Fast state-machine, retry, timeout, cancellation, and duplicate-recovery tests
  • Redacted optional-canary receipt with a declared credit ceiling

Return the environment, organization alias, operation and task identifiers, API and SDK versions, model or router policy, source-contract fingerprint, task-state evidence, credit boundary, output disposition, unresolved risk, rollback state, and final decision without exposing API secrets, prompt or media contents, or temporary signed URLs.

Examples

A developer reproduces a timeout after task creation by advancing a fake clock. The service restarts, finds the stored task ID, resumes retrieval, and copies a fixture output without creating a second task or spending credits.

Error Handling

FailureResponse
A unit test reaches the networkFail closed and replace the unmocked client path.
Fixture accepts output on a non-success stateCorrect the contract and add a regression assertion.
Canary variables are partially setRefuse the call and print the missing approval fields without printing the secret.

Validation

Run the suite with network access disabled, prove all six task states, simulate a lost create response and expired output, and separately document any approved live canary. Routine local success must not depend on provider availability.

Resources

© 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/runway-local-dev-loop of jeremylongshore/tons-of-skills-marketplace.

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

Open the folder on GitHubat commit cfae287

Compare with similar skills

Runway 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.

Runway Local Dev Loop compared with similar skills
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Runway Local Dev Loop this skilljeremylongshore/tons-of-skills-marketplace2.8k—~1.3kAutomated safety check: PassMIT
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GreptimeDB Dev Docker ImageGreptimeTeam/greptimedb6.7k—~4kAutomated safety check: NotesApache-2.0
KubeSphere ServiceMesh Managerkubesphere/kubesphere17k—~2.4kAutomated safety check: PassCustom licence
Vercelremotion-dev/remotion63k—~1.2kAutomated safety check: PassCustom licence
AWS Cdk Developmentzxkane/aws-skills3672 repos~2.5kAutomated safety check: PassMIT

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Categories

Questions about Runway Local Dev Loop

What does Runway Local Dev Loop do?

Build and test a Runway integration locally with recorded contracts, deterministic task states, and an opt-in paid canary. Runway Local Dev Loop is an agent skill from jeremylongshore/tons-of-skills-marketplace. Build and test a Runway integration locally with recorded contracts, deterministic task states, and an opt-in paid canary.

When should I use Runway Local Dev Loop?

Runway Local Dev Loop fits situations like: shortening iteration without duplicate spend; with: develop Runway locally; mock Runway tasks; runway dev loop.

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

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

How do I install Runway Local Dev Loop in Codex?

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

Can I use Runway 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 runway-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/runway-local-dev-loop, .gemini/skills/runway-local-dev-loop, .github/skills/runway-local-dev-loop and .opencode/skills/runway-local-dev-loop in your project.

What does Runway Local Dev Loop need to run?

Going by SKILL.md and its folder, Runway Local Dev Loop needs credentials named RUNWAYML_API_SECRET. Our summary lists: A credential in RUNWAYML_API_SECRET. Its frontmatter pre-approves these tools: Read, Grep, Write, Edit. Compatibility (from SKILL.md): Requires server-side Runway Dev access, current first-party documentation, an approved credit budget, and controlled media storage..

Does Runway Local Dev Loop access the network?

SKILL.md names 1 domain. As links in the text: docs.dev.runwayml.com. This is read from the text; nothing was executed.

Is Runway Local Dev Loop safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Runway Local Dev Loop use?

Runway 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 Runway Local Dev Loop use?

About 1.3k tokens (SKILL.md is roughly 5.2k 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 969 tokens, read only when the agent opens those files.

What are the alternatives to Runway Local Dev Loop?

Skills that share tags, products or a category with Runway Local Dev Loop: Kubeshark Installer (kubeshark/kubeshark, 12k stars), GreptimeDB Dev Docker Image (GreptimeTeam/greptimedb, 6.7k stars), KubeSphere ServiceMesh Manager (kubesphere/kubesphere, 17k stars) and Vercel (remotion-dev/remotion, 63k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Runway Local Dev Loop?

jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,827 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 10, 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.