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.
npx agentmods add rules/prismicio/prismic-mcp-server/mcp-server-tool-registrationgit clone --depth 1 https://github.com/prismicio/prismic-mcp-serverWrote 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/prismicio/prismic-mcp-server/mcp-server-tool-registration)<a href="https://agentmods.dev/rules/prismicio/prismic-mcp-server/mcp-server-tool-registration"><img src="https://agentmods.dev/badge/rules/prismicio/prismic-mcp-server/mcp-server-tool-registration.svg" alt="Measured on agentmods" 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 | $0.00012 | $0.00410 |
| Opus 5 | $0.00006 | $0.00205 |
| Sonnet 5 | $0.00002 | $0.00082 |
| Haiku 4.5 | $0.00001 | $0.00041 |
Grade A, and why
mcp-server-tool-registration 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 6d 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.
What it actually says
MCP Server Tool Registration
actions:
- type: reject
conditions:
- pattern: "server\.tool\([^)]get_repository_locales[^)]\)" message: "When registering a tool, use the spread operator: server.tool(...get_repository_locales)"
- pattern: "import\s+\{[^}]*\}\s+from\s+['"]\.\/tools\/get_repository_locales['"];" message: "Import tools as named imports from their respective files in src/mcp/tools/."
- type: suggest
message: |
When adding a new tool to the MCP server:
- Define the tool in src/mcp/tools/ using the tool helper.
- Export the tool as a named export.
- Import the tool into src/mcp/server.ts as a named import.
- Register the tool with the MCP server using server.tool(...yourTool).
- Use the spread operator when registering tools.
examples:
-
input: | import { get_repository_locales } from "./tools/get_repository_locales" server.tool(...get_repository_locales) output: "Good: Tool imported and registered correctly"
-
input: | import get_repository_locales from "./tools/get_repository_locales" server.tool(get_repository_locales) output: "Bad: Should use named import and spread operator"
metadata: priority: high version: 1.0
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.
- 6d ago First seen · 48 lines · 12 tokens per session scan A f91c0468b86d
mcp-server-tool-registration is a cursor rule published in the GitHub repository prismicio/prismic-mcp-server (5 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 12 tokens to every session and 410 once invoked, about $0.0001 per session on Opus 5. 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
prefer-assertions-over-defensive-checks
Prefer assertions over defensive checks when data is guaranteed to be valid.
as-contract-cast-smell
// ❌ WRONG — bypasses the family ContractSerializer seam const contract = JSON.parse(raw) as Contract; const contract = JSON.parse(raw) as Contract .
no-family-vocabulary-in-framework
The framework domain (packages/1-framework) carries no family- or target-specific vocabulary — types, fields, hooks, or strategy values. Enforced by the no-family-vocabulary Biome plugin plus lint:framework-vocabulary.
use-contract-ir-factories
Use factory functions for creating ContractIR objects instead of manual object creation.
interface-factory-pattern
Interface-based design with factory functions (keep classes private).
explicit-opt-in-over-diagnostics
Prefer requiring explicit opt-in over emitting diagnostics on intentional user paths.