Building MCP Tools: Best Practices for 2026
The MCP ecosystem now has thousands of tools. Here's how to make yours stand out.
1. Start With a Clear Problem
The best MCP tools do one thing extremely well. Before writing code, answer:
- What specific problem does this solve?
- Who is the user? (Developer? Product manager? Data scientist?)
- What's the simplest possible API?
If you can't describe your tool in one sentence, it's too broad.
2. Design a Clean Schema
MCP tools expose their capabilities via a JSON schema. Keep it intuitive:
<span class="hljs-punctuation">{</span>
<span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"get_weather"</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"description"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"Get current weather for a city"</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"parameters"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
<span class="hljs-attr">"city"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"string"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"description"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"City name"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"units"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"string"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"enum"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span><span class="hljs-string">"celsius"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"fahrenheit"</span><span class="hljs-punctuation">]</span> <span class="hljs-punctuation">}</span>
<span class="hljs-punctuation">}</span>
<span class="hljs-punctuation">}</span>
Flat parameters beats nested objects. Descriptive names beat abbreviations.
3. Write a Killer README
Your README is your storefront on mcpm. Include:
- What it does (first paragraph)
- Quick start (copy-paste install)
- All available tools with examples
- Authentication setup if needed
- Link to GitHub repo
4. Handle Errors Gracefully
AI agents will call your tool in unexpected ways. Return clear, structured error messages — not raw stack traces.
5. Version Responsibly
Follow semver. Breaking changes get a major bump. mcpm handles version resolution automatically, but your users will thank you for being predictable.
6. Test With Real Agents
Don't just unit test — run your tool with actual MCP clients like Claude Desktop or Cursor. You'll catch integration issues early.
Building an MCP tool? Publish it on mcpm and share the link below. We'd love to feature great tools.
#MCP #BestPractices #DevTools #OpenSource #mcpm
Building MCP Tools: Best Practices for 2026
The MCP ecosystem now has thousands of tools. Here's how to make yours stand out.
1. Start With a Clear Problem
The best MCP tools do one thing extremely well. Before writing code, answer:
If you can't describe your tool in one sentence, it's too broad.
2. Design a Clean Schema
MCP tools expose their capabilities via a JSON schema. Keep it intuitive:
<span class="hljs-punctuation">{</span> <span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"get_weather"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"description"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"Get current weather for a city"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"parameters"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"city"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"string"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"description"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"City name"</span> <span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"units"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"string"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"enum"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span><span class="hljs-string">"celsius"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"fahrenheit"</span><span class="hljs-punctuation">]</span> <span class="hljs-punctuation">}</span> <span class="hljs-punctuation">}</span> <span class="hljs-punctuation">}</span>Flat parameters beats nested objects. Descriptive names beat abbreviations.
3. Write a Killer README
Your README is your storefront on mcpm. Include:
4. Handle Errors Gracefully
AI agents will call your tool in unexpected ways. Return clear, structured error messages — not raw stack traces.
5. Version Responsibly
Follow semver. Breaking changes get a major bump. mcpm handles version resolution automatically, but your users will thank you for being predictable.
6. Test With Real Agents
Don't just unit test — run your tool with actual MCP clients like Claude Desktop or Cursor. You'll catch integration issues early.
Building an MCP tool? Publish it on mcpm and share the link below. We'd love to feature great tools.
#MCP #BestPractices #DevTools #OpenSource #mcpm