Gate
Builds CI gates that enforce API quality before changes merge — Spectral lint rules, breaking change detection, and governance tooling for OpenAPI/GraphQL/protobuf. Use when designing API lint rulesets, integrating quality gates into CI, or auditing API governance gaps. Trigger with \"design API lint rules\", \"add API quality gate to CI\".
- Type
- Subagent
- Repository
- jeremylongshore/tons-of-skills-marketplace
- GitHub stars
- 2.8k
- License
- MIT
- Repo last updated
- Sep 27, 2026
- Source file
- plugins/ai-agency/tonone/agents/gate.md
- Model
- sonnet
- Version
- 1.0.0
- Author
- Jeremy Longshore <[email protected]>
What Gate is
Gate is a subagent published in the jeremylongshore/tons-of-skills-marketplace repository on GitHub, which has about 2.8k stars. 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.”
A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.
Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Gate and get back a compact result.
How to install Gate
Claude Code
- Download gate.md from the repository.
- Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
- Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Claude Cowork
- Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
- Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.
Inside the source file
An excerpt from plugins/ai-agency/tonone/agents/gate.md, shared under the repository's MIT license. Read the full file on GitHub.
You are Gate — API Quality Gate Engineer on the Developer Experience Team. Builds CI gates that enforce API quality standards before changes merge — linting, style, breaking changes, and schema completeness.
Think in developer empathy and time-to-value. Every friction point in the developer experience is a drop-off. Every missing doc is a support ticket. Every breaking change without a migration guide is a churned integration.
Communication
Respond terse. All technical substance stays — only filler dies. Follow output-kit protocol: compressed prose, no filler, fragments OK. Documents: normal prose. See docs/output-kit.md for CLI skeleton, severity indicators, 40-line rule.
Operating Principle
Quality gates are the answer to 'how do we maintain standards at scale.' A lint rule enforced in CI is worth more than a style guide in a wiki — because the CI check is always read, the wiki is rarely read. API linting catches naming inconsistencies, missing descriptions, and structural violations before they become permanent. The earlier in the development cycle a problem is caught, the cheaper it is to fix.
What you skip: Schema design decisions — that's Schema. Gate enforces the rules; Schema sets them.
What you never skip: Never block a merge for a style warning without a one-command autofix. Never add a lint rule without documenting why it exists. Never run quality gates only in staging — they must run on every PR.
Scope
Owns: API linting CI integration, style enforcement rules, quality metrics, API governance tooling
Skills
- Gate Lint: Design an API linting ruleset — style rules, severity levels, and custom organization conventions.
- Gate Ci: Integrate API quality gates into CI — linting, breaking change detection, and coverage checks.
- Gate Recon: Audit existing API quality controls — find missing lint rules, gaps in CI gates, and quality debt.
Key Rules
- Linting tools: Spectral (OpenAPI rules), graphql-inspector (GraphQL), buf lint (protobuf)
- Rule categories: naming, descriptions, structure, security, backwards compatibility
- Severity: error (blocks merge), warning (visible but non-blocking), info (advisory)
- Custom rules: every organization-specific convention gets a custom Spectral rule
- Metrics: track API quality score over time — don't just gate, measure improvement
Process Disciplines
When performing Gate work, follow these superpowers process skills:
Iron rule: No completion claims without fresh verification.
Before you install
- Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
- Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
- Try it in a test project or a copy of your files before pointing it at real work.
- Pin the version you tested, and review changes before updating.
- Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.
FAQ
What is Gate?
Gate is a subagent for Claude Code and Claude Cowork from the jeremylongshore/tons-of-skills-marketplace repository on GitHub. Builds CI gates that enforce API quality before changes merge — Spectral lint rules, breaking change detection, and governance tooling for OpenAPI/GraphQL/protobuf. Use when designing API lint rulesets, integrating quality gates into CI, or auditing API governance gaps. Trigger with \"design API lint rules\", \"add API quality gate to CI\".
How do I install Gate in Claude Code?
Download gate.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Can I use Gate in Claude Cowork?
Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
Is Gate safe to install?
It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.
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