Implementation blueprint from spike experiments — SEP-2640 Skills support AND the schema-server toolkit lift (config-driven MCP servers for SQL / GraphQL / OpenAPI backends). Requirements, proven patterns, multi-dialect SQL connector trait, two-axis Skills (Type 1 build-time vs Type 2 runtime SEP-2640), and the dual-surface invariant. Auto-loaded during implementation work.

2026-05-1753

config-authoring

paiml/rust-mcp-sdk

Help a developer design a config.toml for a PMCP schema-server toolkit deployment, applying the Pareto principle to curated tools and code-mode policy.

2026-05-1753

hello-world

paiml/rust-mcp-sdk

Demonstrates the simplest possible MCP skill

2026-05-1553

refunds

paiml/rust-mcp-sdk

Process customer refund requests per company policy

2026-05-1553

name	code-mode
description	Generate validated GraphQL queries against this server's schema

Code Mode

This server exposes validate_code and execute_code tools for running LLM-generated GraphQL queries with cryptographically signed approval tokens.

Before you generate a query

Read skill://code-mode/references/schema.graphql for available types.
Read skill://code-mode/references/examples.md for canonical patterns.
Read skill://code-mode/references/policies.md for what's allowed.

Round-trip

Generate a GraphQL query that satisfies the user's request.
Call validate_code(code: "<your query>"). You'll get back an approval_token plus a human-readable explanation. Show the explanation to the user.
After user approval, call execute_code(code, token). Any modification to code between validate and execute invalidates the token.

When NOT to use code mode

For simple lookups that match a curated tool (e.g. get_user_by_id), prefer that tool. Code mode is for the long tail of compositions that don't have dedicated tools.