Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
git clone --depth 1 https://github.com/dstotijn/mcp-cbs-cijfers-open-dataWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/rules/dstotijn/mcp-cbs-cijfers-open-data/go-mcp)<a href="https://agentmods.dev/rules/dstotijn/mcp-cbs-cijfers-open-data/go-mcp"><img src="https://agentmods.dev/badge/rules/dstotijn/mcp-cbs-cijfers-open-data/go-mcp/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/rules/dstotijn/mcp-cbs-cijfers-open-data/go-mcp"><img src="https://agentmods.dev/badge/rules/dstotijn/mcp-cbs-cijfers-open-data/go-mcp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00000 | $0.01016 |
| Opus 5.5 | $0.00000 | $0.00406 |
| Sonnet 5.5 | $0.00000 | $0.00203 |
| Haiku 4.5 | $0.00000 | $0.00102 |
Grade A, and why
go-mcp scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
1 near-identical copy found in the catalogue:
- go-mcp — 95% identical, 19 lines differ
How it starts
The opening of the file, as written. The whole thing — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Description
This rule provides guidelines for working with the Model Context Protocol (MCP) in Go applications using the go-mcp library. MCP is a protocol for AI assistants to interact with external tools and services.
Rule
When working with MCP in Go:
MCP Server Setup
- Use
mcp.NewServer()with appropriate configuration options to create a new MCP server - Configure transports based on requirements (stdio, HTTP/JSON-RPC, SSE)
- Always handle graceful shutdown of the server
- Use context for cancellation and timeouts
- Register all tools before starting the server
Tool Implementation
- Define tool parameters as Go structs with JSON tags
- Add descriptive comments to struct fields for parameter documentation
- Use
mcp.CreateTool()to create new tools with proper definitions - Focus on business logic in tool handlers (validation is automatic)
- Return appropriate
mcp.CallToolResultobjects with clear content
Content Types
- Use appropriate content types (
mcp.TextContent,mcp.JSONContent, etc.) - Structure complex responses using multiple content objects
- Set the
IsErrorflag when returning error results - Use helper functions for common response patterns
Context Handling
- Pass context through to all tool handlers
- Respect context cancellation in long-running operations
- Use context timeouts for external API calls
- Add appropriate values to context when needed
Error Handling
- Return error results rather than panicking
- Provide clear, user-friendly error messages
- Include relevant details in error messages
- Use helper functions for creating error responses
Testing
- Write unit tests for tool handlers
- Mock external dependencies in tests
- Test both success and error cases
- Use table-driven tests for multiple scenarios
Implementation
- The Cursor IDE will enforce this rule by:
- Providing suggestions for MCP implementation
- Highlighting potential issues in MCP code
- Offering refactoring options to improve code quality
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 149 lines · 1,016 tokens per session scan A cf3e31a8bdff
go-mcp is a cursor rule published in the GitHub repository dstotijn/mcp-cbs-cijfers-open-data (9 stars, last pushed 1y ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 1,016 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other cursor rules, from other repositories
gonavi-go
A Go coding rule set for the GoNavi repository, based on common Go style guides and the project's own conventions. It covers file structure, errors, context, concurrency, logging, and tests.
backend
You are an expert in Go, Gin, Gorm, Gen, Cosy (https://cosy.uozi.org/) with a deep understanding of best practices and performance optimization techniques in these technologies.
code-style
Formatting, lint, comments language.
go-grpc-service-rule
A set of Chinese-language rules for implementing gRPC services in Go. gRPC is a way for software services to communicate using defined messages and procedures.
go
Go conventions for all Zapstore Go projects (zsp, server, zindex, zapstore-cli).
shared-libraries
Shared libraries - condition framework, inventory containers, file-backed DB, itinerary, references.