First identify where the plugin is supposed to run and which part is failing. Claude plugins can include skills, commands, agents, hooks, and MCP servers; installing a package does not mean every component runs in every Claude surface. A missing component may be a surface limitation, a runtime or integration fault, or—if it runs but produces weak work—a problem with the design brief rather than the installation.
Start by identifying the Claude surface and the failure
Note whether you are using Claude on the web, Claude Desktop’s Chat tab, Cowork, or Claude Code in a terminal. Also record the account you are signed into, the plugin’s name and source, the component that should run, and the exact error or unexpected result. Claude’s plugin help page says plugins added in web chat, Desktop Chat, or Cowork are saved to the account and are also available in Claude Code when you sign in with that same account. It describes plugin availability for paid plans (Pro, Max, Team, and Enterprise); check the current page for the latest plan details.
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Separate two questions: is the plugin or component available and executing, and is its output useful? A component that never runs needs a different fix from one that runs successfully but produces an incomplete or generic design.
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A plugin is a bundle, not one indivisible feature. The Plugins API describes skills as task-specific instructions and files, commands as saved prompts, agents as helpers Claude can delegate work to, hooks as actions triggered by session events, and MCP servers as connections to external tools or data. The package manifest is .claude-plugin/plugin.json.
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Match the symptom to the component before changing the whole plugin:
- Plugin missing: Verify the signed-in account and surface, then confirm the plugin is added and enabled in the current interface.
- Hook or sub-agent missing in chat: This may be expected. Claude’s surface-support guidance says hooks and sub-agents run in Cowork and Claude Code, not chat.
- Skill or command visible but not selected or useful: Check whether the task matches its description and whether its instructions specify inputs, constraints, and expected output. If there is no execution error, investigate instruction selection or prompt design before reinstalling.
- MCP-backed action fails: Check the external service and its prerequisites separately from the plugin’s instructions.
Diagnose Claude Code installation and runtime problems
Check the installation
In Claude Code, run claude doctor to check the installation type and version, as recommended in Anthropic’s setup guidance. If you encounter a permission error, follow its configuration guidance. Anthropic warns against using sudo npm install -g because it can cause permission problems and security risks.
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- INCREDIBLE CONTRAST: The VA panel produces brighter whites and deeper blacks. You get true-to-life images and more gradients with 16.7 million colors
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Reproduce with verbose output
Start a session with claude --verbose. Anthropic’s CLI reference says verbose mode shows full turn-by-turn output and is useful for debugging. Preserve the error and note whether the component is absent, starts and exits, or returns content Claude cannot use.
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Isolate whether the plugin is responsible
Compare the same task with the relevant plugin enabled and disabled, changing only that condition. Anthropic’s plugin announcement describes plugins as toggleable, though it dates from the public-beta period; use current documentation or the interface for exact behavior. If the result changes, inspect the implicated component. If it does not, examine the prompt, project context, model response, or another integration rather than assuming the plugin is at fault.
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Check dependencies in design-tool workflows
For a Figma workflow in Claude Code, Anthropic’s MCP design and media example lists the latest Figma Desktop with Dev Mode MCP Server as a prerequisite. Confirm that connection before revising plugin instructions. If the MCP connection works but the design still misses the brief, focus on the skill or command and the request itself.
Improve design output after confirming execution
When the component runs but the result is generic, incomplete, or off-brief, make the request specific enough to evaluate instead of reinstalling blindly. Anthropic’s prompting guidance recommends examples for steering output format, tone, and structure; its frontend design material also favors a distinctive direction over generic defaults.
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State the audience and use case, the artifact you want, the visual direction, required content and hierarchy, and constraints such as brand colors or framework. Specify what to avoid and include concrete examples or references when available. Ask for a defined deliverable—a page, component, or design proposal—and assess it against a short set of checks, such as responsive layout, readable contrast, clear hierarchy, and complete content. These steps improve the brief; they do not guarantee a particular plugin’s output quality.
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- Not visible where expected? Check the account, plan, surface, and whether the plugin is added and enabled. Confirm that the specific component is supported there.
- Claude Code install or permissions problem? Run
claude doctorand use Anthropic’s setup guidance. - Unsure where execution fails? Reproduce with
claude --verboseand keep the error details. - Only one component fails? Inspect its role and dependencies, such as an MCP server, instead of treating the entire plugin as broken.
- It runs but the design is weak? Improve the brief and provide examples; check any external design-tool prerequisite independently.
Anthropic’s current documentation does not establish a complete plugin-specific validation or cache/reload troubleshooting matrix. For version-sensitive commands, use the Claude Code documentation that corresponds to your installed version rather than relying on third-party instructions.
Quick Recap
Best Value
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