sdk

Apcore Skills — SDK

Bootstrap a new apcore core SDK or MCP bridge in a new language.

Iron Law

EVERY NEW SDK MUST IMPLEMENT THE FULL PROTOCOL API CONTRACT. No partial SDKs — if you ship it, it must cover all exported symbols from the reference implementation.

Anti-Rationalization Table

Thought	Reality
"I'll start with just the core classes"	Start with a complete project skeleton. Feature implementation order is code-forge's job.
"Copy the Python structure exactly"	Use idiomatic target-language patterns. Same concepts, different structure.
"Tests can come later"	TDD is mandatory. Test infrastructure is set up in scaffolding.
"I'll figure out the naming as I go"	Naming is defined by conventions.md. Apply language rules from day one.

When to Use

• Starting a new apcore SDK in Go, Rust, Java, C#, PHP, etc.
• Starting a new apcore MCP bridge in a new language
• Re-scaffolding an existing SDK that needs restructuring

Command Format

/apcore-skills:sdk <language> [--type core|mcp] [--ref apcore-python]

Parameter	Required	Default	Description
<language>	Yes	—	Target language: go, rust, java, csharp, kotlin, swift, php
--type	No	core	What to scaffold: core (SDK) or mcp (MCP bridge)
--ref	No	auto-detect	Reference implementation to extract API from

Context Management

Steps 2 and 4 use sub-agents. Step 2 analyzes the reference implementation. Step 4 generates the project skeleton. The main context orchestrates and retains only summaries.

Workflow

Step 0 (ecosystem) → 1 (parse args) → 2 (extract API contract) → 3 (tech stack) → 4 (scaffold) → 5 (feature specs) → 6 (plan generation) → 7 (summary)

Detailed Steps

Step 0: Ecosystem Discovery

@../shared/ecosystem.md

---

Step 1: Parse Arguments

Parse $ARGUMENTS:

1. Extract <language> — required, use AskUserQuestion if missing
2. Extract --type — default core
3. Extract --ref — resolve reference repo (priority order):
   • If --ref explicitly specified: use that
   • If CWD is a same-type apcore repo (e.g., in apcore-python/ and --type core): use CWD repo as reference
   • Otherwise auto-detect: for core prefer apcore-python, for mcp prefer apcore-mcp-python

Derive target repo name:

• Core SDK: apcore-{lang} (e.g., apcore-go, apcore-java)
• MCP bridge: apcore-mcp-{lang} (e.g., apcore-mcp-go)

Derive target path: {ecosystem_root}/apcore-{type}-{lang}/ (or {ecosystem_root}/{framework}-apcore/)

Check if target directory already exists:

• If exists with source files: warn and ask — "Update scaffolding" / "Use as-is" / "Cancel"
• If exists but empty: proceed

Display:

SDK Bootstrap:
  Language:   {lang}
  Type:       {core|mcp}
  Reference:  {ref-repo} ({ref-lang})
  Target:     {target-path}

---

Step 2: Extract API Contract (Sub-agent)

Spawn Task(subagent_type="general-purpose"):

Sub-agent prompt:

Extract the complete public API contract from the apcore reference implementation for porting to {lang}.

Reference repo: {ref_path}
Reference type: {core|mcp}

Read the following files and extract the full API surface:

For core SDK:
1. src/{package}/__init__.py (or src/index.ts) — all public exports
2. For each exported class: read source file, extract constructor + all public methods with full signatures
3. src/{package}/errors.py (or errors.ts) — all error classes and codes
4. src/{package}/middleware/ — middleware interfaces
5. src/{package}/registry/ — registry interfaces
6. src/{package}/schema/ — schema interfaces
7. src/{package}/observability/ — observability interfaces

For MCP bridge:
1. src/{package}/__init__.py (or src/index.ts) — all public exports
2. src/{package}/server/ — server factory, transport interfaces
3. src/{package}/auth/ — authentication interfaces
4. src/{package}/adapters/ — adapter interfaces
5. src/{package}/converters/ — converter interfaces

Also read:
- {protocol_path}/PROTOCOL_SPEC.md — for authoritative definitions
- {protocol_path}/docs/spec/type-mapping.md — if exists, for type translations

Return a structured API contract in this format:

API_CONTRACT:
  type: {core|mcp}
  source: {ref-repo}
  source_version: {version}
  export_count: {N}
  module_count: {N} (number of source files/modules)

MODULES:
- module: {module-name} (e.g., "executor", "registry", "schema")
  file: {source-file}
  classes:
    - {ClassName}:
        constructor: ({params with types and defaults})
        methods:
          - {name}({params}) -> {return} [async] [static]
  functions:
    - {name}({params}) -> {return} [async]
  types:
    - {TypeName}: {definition}
  constants:
    - {NAME}: {type} = {value}

ERROR_HIERARCHY:
  base: {BaseErrorName}
  codes: {ErrorCodeEnum with all values}
  classes:
    - {ErrorName}(code={CODE}, parent={Parent})

EXTENSION_POINTS:
  - {interface-name}: {method signatures}

Error handling:
- If the reference repo path does not exist, return: STATUS: NOT_FOUND, REASON: "Reference repo not found at {path}"
- If __init__.py/index.ts is missing or empty, return: STATUS: NO_EXPORTS, REASON: "No public exports found"
- If PROTOCOL_SPEC.md is missing, proceed with reference implementation only and note: "Protocol spec not found, using reference impl as sole authority"
- If individual source files cannot be read, skip them and note in the summary

Target ~5-8KB summary.

Store as api_contract. If the sub-agent returns STATUS: NOT_FOUND or NO_EXPORTS, display error and use AskUserQuestion to either provide a different reference or abort.

---

Step 3: Confirm Tech Stack

Use AskUserQuestion to confirm the target language tech stack.

@../shared/conventions.md (refer to "Testing Conventions" and "Dependency Conventions" sections)

For Go:

• Go version: "1.21+ (Recommended)" / "1.22+"
• Module path: default github.com/aipartnerup/apcore-go
• Test extras: "Standard testing (Recommended)" / "testify"
• Schema validation: "go-jsonschema (Recommended)" / "gojsonschema" / "Other"

For Rust:

• Rust edition: "2021 (Recommended)" / "2024"
• Async runtime: "tokio (Recommended)" / "async-std" / "None (sync only)"
• Serialization: "serde (Recommended)" / "Other"
• Schema: "schemars (Recommended)" / "Other"

For Java:

• Java version: "17+ (Recommended)" / "21+"
• Build tool: "Gradle (Recommended)" / "Maven"
• Schema validation: "Jackson (Recommended)" / "Gson"
• Test framework: "JUnit 5 (Recommended)" / "TestNG"

For other languages: Single open-ended question about tech stack preferences.

Store tech_stack decisions.

---

Step 4: Scaffold Project (Sub-agent)

Spawn Task(subagent_type="general-purpose"):

Sub-agent prompt:

Create the project skeleton for {target-repo-name} at {target-path}.

Language: {lang}
Type: {core|mcp}
Tech stack: {tech_stack decisions}
Package name: {derived package name per conventions}

## Project Structure

Follow the apcore project structure convention:

{For core SDK:}
{target-path}/
├── {build-config}                    # pyproject.toml / package.json / go.mod / Cargo.toml
├── .gitignore                        # language-appropriate patterns
├── README.md                         # project name, description, installation, link to docs
├── CHANGELOG.md                      # empty "## [Unreleased]" section
├── LICENSE                           # Detect from existing ecosystem repos or ask user (MIT / Apache-2.0)
├── src/                              # or language-appropriate source dir
│   ├── {main-module-file}            # exports (empty stubs with TODO)
│   ├── executor.{ext}               # stub
│   ├── context.{ext}                # stub
│   ├── module.{ext}                 # stub
│   ├── config.{ext}                 # stub
│   ├── errors.{ext}                 # stub with ErrorCode enum and base error
│   ├── acl.{ext}                    # stub
│   ├── approval.{ext}              # stub
│   ├── async_task.{ext}            # stub
│   ├── bindings.{ext}              # stub
│   ├── decorator.{ext}             # stub
│   ├── extensions.{ext}            # stub
│   ├── cancel.{ext}               # stub — cancellation support
│   ├── trace_context.{ext}        # stub — trace context propagation
│   ├── middleware/                   # stub directory
│   ├── registry/                    # stub directory
│   ├── schema/                      # stub directory
│   ├── observability/               # stub directory
│   └── utils/                       # stub directory
└── tests/
    └── {test-config}                # pytest.ini / vitest.config / test runner config

{For MCP bridge:}
{target-path}/
├── {build-config}
├── .gitignore
├── README.md
├── CHANGELOG.md
├── LICENSE                              # Detect from existing ecosystem repos or ask user (MIT / Apache-2.0)
├── src/
│   ├── {main-module-file}
│   ├── server/                      # factory, transport stubs
│   ├── auth/                        # JWT stub
│   ├── adapters/                    # adapter stubs
│   ├── converters/                  # converter stubs
│   ├── cli.{ext}                   # CLI entry point stub
│   └── explorer/                    # optional: web UI stubs
└── tests/
    └── {test-config}

## Stub File Content

Each stub file should contain:
1. Module/file header comment referencing the protocol spec section
2. Import of base types from the main module
3. Class/function stubs with correct signatures from the API contract
4. TODO comments indicating what needs to be implemented
5. Type annotations matching the language convention

## API Contract Reference
{api_contract from Step 2}

## Naming
Apply {lang} naming conventions:
- Python: snake_case for functions/methods, PascalCase for classes
- TypeScript: camelCase for functions/methods, PascalCase for classes
- Go: PascalCase for public, camelCase for private
- Rust: snake_case for functions/methods, PascalCase for types
- Java: camelCase for methods, PascalCase for classes
- C#: PascalCase for methods and classes, camelCase for parameters/locals
- Kotlin: camelCase for functions/methods, PascalCase for classes
- Swift: camelCase for functions/methods, PascalCase for types/protocols
- PHP: camelCase for methods, PascalCase for classes, $camelCase for variables

Error handling:
- If {target-path} is not writable, return: STATUS: WRITE_ERROR, REASON: "{description}"
- If a file cannot be created, skip it and include in the return as "{file} (SKIPPED: {reason})"
- If the language is not recognized, return: STATUS: UNSUPPORTED_LANG, REASON: "No scaffold template for {lang}"

Create ALL files listed above. Return the list of files created.

After sub-agent completes, verify:

• Build config file exists
• Main module file exists with exports
• At least 5 source files exist
• Tests directory exists
• README.md exists

---

Step 5: Generate Feature Specs

Check if feature specs already exist at {protocol_path}/docs/features/*.md.

If they exist:

• Link to them via .code-forge.json configuration
• Display: Feature specs found: {N} specs in {protocol_path}/docs/features/

If they don't exist:

• Extract module list from the API contract
• Generate lightweight feature specs at {target-path}/docs/features/:
  • One per module (executor, registry, schema, etc.)
  • Each spec contains: module purpose, public API surface, acceptance criteria
• Display: Feature specs generated: {N} specs in docs/features/

---

Step 6: Generate .code-forge.json and Trigger Planning

Write {target-path}/.code-forge.json:

{
  "_tool": {
    "name": "code-forge",
    "description": "Transform documentation into actionable development plans",
    "url": "https://github.com/tercel/code-forge"
  },
  "directories": {
    "base": "./",
    "input": "{relative-path-to-feature-specs}",
    "output": "planning/"
  },
  "reference_docs": {
    "sources": ["{relative-path-to-ref}/planning/*/plan.md"]
  },
  "port": {
    "source_docs": "{relative-path-to-protocol}",
    "reference_impl": "{relative-path-to-ref}",
    "target_lang": "{lang}"
  },
  "execution": {
    "default_mode": "ask",
    "auto_tdd": true,
    "task_granularity": "medium"
  }
}

Git initialization is left to the user. Display:

Project scaffolded. To initialize git:
  cd {target-path}
  git init
  git add <files...>
  git commit -m "chore: initialize {target-repo-name} project skeleton"

---

Step 7: Display Summary and Next Steps

apcore-skills:sdk — SDK Bootstrap Complete

Target: {target-path}
Language: {lang}
Type: {core|mcp}
Modules: {N} source files scaffolded
Feature specs: {N} specs available
API contract: {N} public symbols to implement

Project structure:
  {tree output of key files}

Next steps:
  cd {target-path}
  /code-forge:port @{protocol-path} --ref {ref-repo} --lang {lang}    Generate implementation plans
  /code-forge:impl {first-feature}                                      Start implementing
  /apcore-skills:sync --lang {lang},{ref-lang}                           Verify API consistency

Coordination with Other Skills

• After sdk: Use code-forge:port to generate implementation plans for each feature
• During implementation: Use code-forge:impl to execute TDD tasks
• After implementation: Use apcore-skills:sync to verify cross-language consistency
• Before release: Use apcore-skills:audit for comprehensive check
• For release: Use apcore-skills:release for coordinated version bump