Canonical manifest schema
plugin.json targets the official 1.0.0 schema.
Agent Plugins specification §5.2
MCP Builder Agent Plugin
Design and build high-quality Model Context Protocol servers with clear tool contracts, TypeScript or Python patterns, transport guidance, and evaluation methods.
0 repository stars Apache-2.0 Updated Aug 8, 2026
Reviewed seed
tools
with contracts.
A small, clear surface between the model and an external service, designed for safe and reliable use.
Protocol before glue
Explainable standards check
Conforms to Agent Plugins 1.0.0
Official latest version: 1.0.0 (Working Draft). The value is read from the official specification and cached for one day.
This is a static package-format check, not a security audit, quality score, malware scan, or guarantee of client compatibility.
Required name and naming rules
The plugin name “mcp-builder” satisfies the 1–64 character naming rules.
Agent Plugins specification §§5.3 and 5.5
Closed top-level schema
No unknown top-level manifest fields were found.
Agent Plugins specification §5.2
Manifest field types
All present metadata and extension fields use permitted JSON types.
Agent Plugins specification §§5.2–5.6
Root plugin.json file
A regular plugin.json file exists at the plugin root.
Agent Plugins specification §§4.1 and 5.1
Agent Skills discovery and format
1 immediate-child Agent Skill discovered; every SKILL.md passed required frontmatter and naming checks.
Agent Plugins specification §7.1 and Agent Skills specification
MCP configuration
No root mcp.json is present; MCP is optional and its absence is conforming.
Agent Plugins specification §§6.2 and 7.2
Capabilities
What can you do with MCP Builder?
Turn an external service into a well-designed MCP surface.
Use this plugin when building an MCP server and the difficult work is choosing tool boundaries, schemas, transports, error handling, and evaluation criteria.
- Research the service and current MCP guidance.
- Design focused tools with clear input and output schemas.
- Implement TypeScript or Python server patterns.
- Choose streamable HTTP or stdio deliberately.
- Evaluate tool usability, errors, security, and documentation.
Design tools for model use
Tool names, descriptions, schemas, outputs, and error messages are treated as the product surface rather than incidental wrappers.
Make trust boundaries explicit
Authentication, network access, file operations, side effects, validation, and deployment concerns remain part of the design review.
Practical workflow
From service research to evaluated MCP server
Pass 01 / Design
Define tasks and tool contracts
Study the service, identify user goals, choose transport, and specify a small set of composable tools.
Pass 02 / Prove
Implement and evaluate
Build with the appropriate SDK, test normal and failure paths, run evaluations, and document setup and limitations.
Package contents
What is included in MCP Builder?
MCP Builder declares 1 Skill, 0 MCP configurations, and 2 additional resources. The included-file links below point to the reviewed source repository.
Agent Skills
1
mcp-builder
MCP servers
0
No runtime service
Package format
Agent Plugins
Official latest 1.0.0
Installation
Copy the complete MCP Builder package
Sparse-clone the plugin directory and load it in a compatible client. The package contains guidance and evaluation helpers, not a preconfigured MCP server.
Terminal · Git sparse checkout
git clone --filter=blob:none --sparse https://github.com/chenmiaohero/Portable-Agent-Plugins.git
cd Portable-Agent-Plugins
git sparse-checkout set plugins/mcp-builderReview scripts and Python dependencies before execution.
Keep service credentials in approved secret storage.
Threat-model side effects and data access before deployment.
Synced source content
Repository README
This README snapshot is stored by Agent Plugins Hub and refreshed by the daily GitHub synchronization pipeline. Remote images and embedded content are not loaded.
This repository does not currently provide a README snapshot. The plugin instructions below remain available.
Source documentation
MCP server development guide
Rendered from the linked GitHub source. Raw HTML is disabled, scripts cannot execute, remote images are omitted, and external links open separately.
What this plugin does
MCP Builder guides the design, implementation, testing, and evaluation of Model Context Protocol servers. It covers service research, tool contracts, transports, TypeScript and Python patterns, errors, documentation, and evaluation.
Practical workflow
Start from user tasks, not service endpoints. Define a small set of composable tools with clear schemas and useful outputs. Choose streamable HTTP or stdio deliberately, implement with the current SDK, and test normal, failure, authorization, and side-effect paths.
Security review
Threat-model authentication, data exposure, file and command access, network destinations, validation, rate limits, and destructive operations. Review the included scripts and dependencies before execution and keep credentials in approved secret storage.
Source
This portable package is maintained in chenmiaohero/Portable-Agent-Plugins from a pinned Apache-2.0 upstream Skill.
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