How to Use Claude Skills and Projec

Claude Projects is essentially a "context silo" that stops the AI from hallucinating about your specific business logic by giving it a permanent memory bank. If you're still pasting the same five API docs and your schema.sql into every new chat, you're wasting tokens and mental energy.

The real power comes from the Project Knowledge section. I’ve found that the "goldilocks zone" for project files isn't dumping the whole repo, but curating a "Context Map." Instead of uploading 50 .ts files, I create a CONTEXT.md file that outlines the architecture, naming conventions, and a map of where the critical logic lives.

When you combine this with a well-crafted Custom Instruction for the project, Claude stops suggesting generic patterns and starts writing code that actually fits your codebase. For example, if I'm working on a Next.js project with a very specific Zod validation pattern, I put this in the Project Instructions:

Always use the validation pattern found in /lib/validations.ts. 
Never use 'any' types; if a type is unknown, use 'unknown' and 
perform a type guard check. 
Prefer server actions over API routes for form submissions.

Now, every chat within that project inherits these rules without me reminding it.

Regarding "Skills"—while Claude doesn't have a formal "plugin store" like some other LLMs, the way to implement "skills" is through Prompt Snippets stored in your Project Knowledge. I keep a file called PROMPTS.md inside my project. Whenever I need a complex refactor or a unit test suite, I don't write a long prompt; I just tell Claude: "Use the 'Test Generator' skill from my PROMPTS.md to cover the edge cases for this function."

Here is how I structure my PROMPTS.md for maximum efficiency:

Skill: Bug Hunter

• Goal: Find race conditions in async functions.
• Process: Analyze the event loop, identify shared state, and suggest a mutex or locking mechanism.

Skill: Documentation Sync

• Goal: Update README.md based on recent code changes.
• Process: Compare the current file diff with the existing docs and rewrite the "Usage" section.

The biggest "gotcha" is the context window limit. Even though Projects have a large capacity, if you upload too many massive logs or redundant files, the AI starts losing the thread (the "lost in the middle" phenomenon). I've learned to aggressively prune my project files. If a feature is deprecated, delete the related doc from the Project Knowledge immediately.

For those integrating this with a local workflow, I recommend using a script to auto-generate a summary.txt of your file tree to keep in the project. It helps Claude navigate your folder structure without having to "guess" where files are located:

# Quick way to give Claude a map of your project structure
find . -maxdepth 2 -not -path '*/.*' > project_map.txt

Adding that project_map.txt to the project knowledge makes the "where should I put this new file?" conversations 10x more accurate.