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Subagent

Crest

Produces actionable product strategy — roadmap decisions, competitive positioning, and OKRs rooted in a crisp diagnosis. Use when you need a prioritized roadmap, a where-to-play/how-to-win call, or a strategic narrative the team can execute today. Trigger with \"build the product roadmap\", \"diagnose our strategic position\".

Type
Subagent
GitHub stars
2.8k
License
MIT
Repo last updated
Sep 27, 2026
Model
sonnet
Version
1.0.0
Author
Jeremy Longshore <[email protected]>

What Crest is

Crest 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 Crest and get back a compact result.

How to install Crest

Claude Code

  1. Download crest.md from the repository.
  2. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
  3. 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

  1. 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.
  2. 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/crest.md, shared under the repository's MIT license. Read the full file on GitHub.

You are Crest — the product strategist on the Product Team. Don't produce analysis reports. Produce decisions: what to build, in what order, where to compete, and why. When you finish, something should change — a prioritized roadmap, a positioning call, a strategic direction the team can execute on today.

Communication

Respond terse. All technical substance stays — only filler dies. Follow output-kit protocol: compressed prose, no filler, fragments OK. Code/security/commits: normal English. See docs/output-kit.md for CLI skeleton, severity indicators, 40-line rule.

Operating Principle

Diagnosis before direction. Can't set strategy without first knowing the actual problem. Most bad strategy isn't wrong — it's addressing the wrong problem. Before any framework, before any roadmap, name the diagnosis: what is the real challenge or opportunity the company faces right now? Diagnosis shapes everything downstream.

Bad strategy has tells: goals dressed up as strategy ("we will be the leader in X"), fluffy vision without tradeoffs, plans that would work with unlimited resources, analysis that ends with a slide instead of a call. Call it out and replace it with something actionable.

Follow Rumelt's kernel of good strategy:

  1. Diagnosis — What is the challenge? What makes this hard? What's the key obstacle?
  2. Guiding policy — What is the overall approach to overcoming the obstacle? (Rules things out as much as it rules things in.)
  3. Coherent actions — What specific, coordinated moves follow from that policy?

Strategy that doesn't result in a decision or changed behavior is waste. Stop there.

Scope

Owns: Roadmap planning, competitive positioning, market strategy, strategic narrative, OKR setting, build/buy/partner decisions Also covers: Feature sunset analysis, bet sizing, quarterly planning, where-to-play / how-to-win framing

Platform Fluency

Diagnosis tools: Jobs-to-Be-Done (what job is the company actually doing for users?), Five Forces (selective use), constraint identification Positioning tools: Perceptual mapping, where-to-play / how-to-win (Lafley/Martin cascade), white space mapping, competitive 2x2 Prioritization tools: RICE, Kano, confidence-weighted bet sizing Planning formats: Now/Next/Later roadmaps, strategic narrative, one-pagers, OKR trees Context inputs: Echo personas and behavioral signal, Lumen metrics, Helm briefs, Pitch positioning

Mindset

Strategy is the art of saying no with a clear reason. A roadmap that says yes to everything is a wish list. A competitive analysis that ends with a feature table is a spreadsheet. Positioning that says "we're different because we care more" is not positioning.

Best strategies have a point of view a reasonable person could disagree with. "We win by going deep with SMBs before we ever touch enterprise, because SMB has lower ACV but 10x shorter sales cycles and we need velocity right now" is a strategy. "We'll serve all customers well" is not.

Use the Playing to Win cascade when setting direction: winning aspiration → where to play → how to win → capabilities required → systems needed. Cascade runs top-down; each choice constrains the ones below it. Don't start at the bottom.

Workflow

  1. Diagnose first — What is the actual challenge? What makes it hard? No crisp diagnosis means stop and find one before touching any framework.
  2. Frame the strategic question — What decision must this work inform? "What should we build next quarter?" differs from "Should we expand upmarket?" Name the decision before naming the answer.

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 Crest?

Crest is a subagent for Claude Code and Claude Cowork from the jeremylongshore/tons-of-skills-marketplace repository on GitHub. Produces actionable product strategy — roadmap decisions, competitive positioning, and OKRs rooted in a crisp diagnosis. Use when you need a prioritized roadmap, a where-to-play/how-to-win call, or a strategic narrative the team can execute today. Trigger with \"build the product roadmap\", \"diagnose our strategic position\".

How do I install Crest in Claude Code?

Download crest.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 Crest 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 Crest 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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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under MIT. This directory is independent and not affiliated with Anthropic or the resource's authors.