Added dependency graph checks, artwork.

README.md

@@ -4,116 +4,37 @@
 
 **Tagline:** *Many arms, one goal — mastery.*
 
-## Vision
+## This revision adds
 
-Didactopus treats AI as a **mentor, curriculum planner, critic, evaluator, and project guide** rather than an answer vending machine. The design goal is to produce capable practitioners who can explain, apply, test, and extend knowledge in real settings.
+- dependency and compatibility checks for domain packs
+- version-range validation against the Didactopus core version
+- local dependency resolution across installed packs
+- richer pack manifests
+- repository artwork under `artwork/`
+- tests for dependency and compatibility behavior
 
-The platform is meant to support **AI-assisted autodidacts**: learners who pursue real expertise outside, alongside, or beyond traditional institutions.
+## Domain packs
 
-## Core principles
+Didactopus supports portable, versioned **domain packs** that can contain:
 
-- Active learning over passive consumption
-- Socratic questioning over direct answer dumping
-- Verification culture over uncritical acceptance
-- Competency gates over time-based progression
-- Project-based evidence of mastery
-- Local-first model use when available
-- Portable, shareable domain plans and learning artifacts
-
-## Initial architecture
-
-The initial prototype is organized around six core services:
-
-1. **Domain Mapping Engine**  
-   Builds a concept graph for a target field, including prerequisites, competencies, canonical problem types, and artifact templates.
-
-2. **Curriculum Generator**  
-   Produces a staged learning roadmap adapted to learner goals and prior knowledge.
-
-3. **Mentor Agent**  
-   Conducts Socratic dialogue, reviews reasoning, and offers targeted critique.
-
-4. **Practice Generator**  
-   Produces exercises aimed at specific concepts and skill gaps.
-
-5. **Project Advisor**  
-   Proposes and scaffolds real projects that demonstrate competence.
-
-6. **Evaluation System**  
-   Scores explanations, problem solutions, project outputs, and transfer tasks against explicit rubrics.
-
-## Distribution model for contributed learning content
-
-Didactopus is designed to support distribution of contributed artifacts, including:
-
-- domain plans
 - concept maps
-- curriculum templates
-- exercise sets
+- roadmap templates
 - project blueprints
-- evaluation rubrics
-- benchmark packs
-- exemplar portfolios
+- rubrics
+- benchmark tasks
+- resource guides
 
-These should be shareable as versioned packages or repositories so that contributors can publish reusable mastery paths for particular domains.
+Packs can depend on other packs, enabling layered curricula and reusable foundations.
 
-See:
-- `docs/artifact-distribution.md`
-- `docs/domain-pack-format.md`
+## Artwork
 
-## Local model strategy
+The repository includes whimsical project art at:
 
-The codebase is designed to support a provider abstraction:
+- `artwork/didactopus-mascot.png`
 
-- **Local-first**: Ollama, llama.cpp server, vLLM, LM Studio, or other on-prem inference endpoints
-- **Remote optional**: API-backed models only when configured
-- **Hybrid mode**: local models for routine mentoring, remote models only for heavier synthesis or evaluation if explicitly allowed
-
-## Repository layout
-
-```text
-didactopus/
-├── README.md
-├── LICENSE
-├── pyproject.toml
-├── Makefile
-├── docker-compose.yml
-├── Dockerfile
-├── .gitignore
-├── .github/workflows/ci.yml
-├── configs/
-│   └── config.example.yaml
-├── docs/
-│   ├── architecture.md
-│   ├── repository-plan.md
-│   ├── component-specs.md
-│   ├── prototype-roadmap.md
-│   ├── artifact-distribution.md
-│   └── domain-pack-format.md
-├── domain-packs/
-│   └── example-statistics/
-│       ├── pack.yaml
-│       ├── concepts.yaml
-│       ├── roadmap.yaml
-│       ├── projects.yaml
-│       └── rubrics.yaml
-├── src/didactopus/
-│   ├── __init__.py
-│   ├── main.py
-│   ├── config.py
-│   ├── model_provider.py
-│   ├── domain_map.py
-│   ├── curriculum.py
-│   ├── mentor.py
-│   ├── practice.py
-│   ├── project_advisor.py
-│   ├── evaluation.py
-│   └── artifact_registry.py
-└── tests/
-    ├── test_config.py
-    ├── test_domain_map.py
-    └── test_artifact_registry.py
-```
+Suggested future additions:
+- `artwork/didactopus-banner.png`
+- `artwork/didactopus-logo.png`
 
 ## Quick start
 
@@ -121,65 +42,6 @@ didactopus/
 python -m venv .venv
 source .venv/bin/activate
 pip install -e .[dev]
-cp configs/config.example.yaml configs/config.yaml
-python -m didactopus.main --domain "statistics" --goal "reach practical mastery"
+python -m didactopus.main --domain "statistics" --goal "practical mastery"
 pytest
 ```
-
-## Prototype capabilities in this scaffold
-
-The current scaffold provides:
-
-- a configuration model for local/remote provider selection
-- a concept graph data structure for domain maps
-- stubs for curriculum, mentor, practice, project, and evaluation services
-- a simple artifact registry for local domain-pack discovery
-- an example domain pack layout
-- a CLI entry point to demonstrate end-to-end flow
-- tests to validate configuration and artifact behavior
-
-## Suggested first implementation milestones
-
-### Milestone 1: Learner and domain modeling
-- learner profile schema
-- concept graph generation
-- prerequisite traversal
-- domain-pack schema validation
-- local artifact discovery
-
-### Milestone 2: Guided study loop
-- Socratic mentor prompts
-- explanation checking
-- exercise generation by competency target
-- evidence capture for learner work
-
-### Milestone 3: Project-centered learning
-- capstone generator
-- milestone planning
-- artifact review rubrics
-- distributed project pack ingestion
-
-### Milestone 4: Mastery evidence
-- explanation scoring
-- transfer tasks
-- benchmark alignment
-- progress dashboard
-- artifact publication workflow
-
-## Notes on evaluation design
-
-A key design choice is that the assessment layer should look for:
-
-- correct explanations in the learner's own words
-- ability to solve novel problems
-- detection of flawed reasoning
-- evidence of successful project execution
-- transfer across adjacent contexts
-
-## Naming rationale
-
-**Didactopus** combines *didactic* / *didact* with *octopus*: a central intelligence coordinating many arms of learning support.
-
-## License
-
-MIT

docs/dependency-resolution.md

@@ -0,0 +1,52 @@
+# Dependency Resolution Plan
+
+## Goals
+
+Didactopus should support a pack ecosystem in which contributors can publish reusable foundations and specialized overlays.
+
+Examples:
+- a general statistics foundations pack
+- a Bayesian statistics extension pack
+- an electronics foundations pack
+- a marine bioacoustics specialization pack
+
+## Manifest fields
+
+Each `pack.yaml` should include:
+- `name`
+- `version`
+- `didactopus_min_version`
+- `didactopus_max_version`
+- `dependencies`
+
+Dependencies use a compact form:
+
+```yaml
+dependencies:
+  - name: statistics-foundations
+    min_version: 1.0.0
+    max_version: 2.0.0
+```
+
+## Validation stages
+
+### Stage 1
+- manifest fields exist
+- content files exist
+- required top-level keys exist
+
+### Stage 2
+- internal references are valid
+- duplicate IDs are rejected
+
+### Stage 3
+- each dependency names an installed pack
+- dependency versions satisfy declared ranges
+- pack compatibility includes current core version
+
+## Future work
+
+- full semantic version parsing
+- cycle detection in dependency graphs
+- topological load ordering
+- trust and signature policies

domain-packs/bayes-extension/concepts.yaml

@@ -0,0 +1,6 @@
+concepts:
+  - id: prior
+    title: Prior
+    prerequisites: []
+    mastery_signals:
+      - explain a prior distribution

domain-packs/bayes-extension/pack.yaml

@@ -0,0 +1,13 @@
+name: bayes-extension
+display_name: Bayesian Extension Pack
+version: 0.3.0
+schema_version: "1"
+didactopus_min_version: 0.1.0
+didactopus_max_version: 0.9.99
+description: Bayesian extension that depends on statistics foundations.
+author: Wesley R. Elsberry
+license: MIT
+dependencies:
+  - name: foundations-statistics
+    min_version: 1.0.0
+    max_version: 1.9.99

domain-packs/bayes-extension/projects.yaml

@@ -0,0 +1,8 @@
+projects:
+  - id: bayes-mini-project
+    title: Bayesian Mini Project
+    difficulty: intermediate
+    prerequisites:
+      - prior
+    deliverables:
+      - short report

domain-packs/bayes-extension/roadmap.yaml

@@ -0,0 +1,7 @@
+stages:
+  - id: stage-1
+    title: Bayesian Basics
+    concepts:
+      - prior
+    checkpoint:
+      - compare priors

domain-packs/bayes-extension/rubrics.yaml

@@ -0,0 +1,6 @@
+rubrics:
+  - id: bayes-rubric
+    title: Bayesian Rubric
+    criteria:
+      - correctness
+      - interpretation

domain-packs/foundations-statistics/concepts.yaml

@@ -0,0 +1,6 @@
+concepts:
+  - id: descriptive-statistics
+    title: Descriptive Statistics
+    prerequisites: []
+    mastery_signals:
+      - explain central tendency

domain-packs/foundations-statistics/pack.yaml

@@ -0,0 +1,10 @@
+name: foundations-statistics
+display_name: Foundations Statistics Pack
+version: 1.2.0
+schema_version: "1"
+didactopus_min_version: 0.1.0
+didactopus_max_version: 0.9.99
+description: Shared foundations for statistics learning.
+author: Wesley R. Elsberry
+license: MIT
+dependencies: []

domain-packs/foundations-statistics/projects.yaml

@@ -0,0 +1,8 @@
+projects:
+  - id: summarize-data
+    title: Summarize Local Data
+    difficulty: introductory
+    prerequisites:
+      - descriptive-statistics
+    deliverables:
+      - summary report

domain-packs/foundations-statistics/roadmap.yaml

@@ -0,0 +1,7 @@
+stages:
+  - id: stage-1
+    title: Foundations
+    concepts:
+      - descriptive-statistics
+    checkpoint:
+      - summarize a dataset

domain-packs/foundations-statistics/rubrics.yaml

@@ -0,0 +1,6 @@
+rubrics:
+  - id: basic-explanation
+    title: Basic Explanation
+    criteria:
+      - correctness
+      - clarity

domain-packs/incompatible-core/concepts.yaml

@@ -0,0 +1,5 @@
+concepts:
+  - id: y
+    title: Y
+    prerequisites: []
+    mastery_signals: []

domain-packs/incompatible-core/pack.yaml

@@ -0,0 +1,10 @@
+name: incompatible-core
+display_name: Incompatible Core Pack
+version: 0.1.0
+schema_version: "1"
+didactopus_min_version: 9.0.0
+didactopus_max_version: 10.0.0
+description: Deliberately incompatible with current core.
+author: Wesley R. Elsberry
+license: MIT
+dependencies: []

domain-packs/incompatible-core/projects.yaml

@@ -0,0 +1,6 @@
+projects:
+  - id: p
+    title: P
+    difficulty: introductory
+    prerequisites: [y]
+    deliverables: []

domain-packs/incompatible-core/roadmap.yaml

@@ -0,0 +1,5 @@
+stages:
+  - id: stage-1
+    title: Y
+    concepts: [y]
+    checkpoint: []

domain-packs/incompatible-core/rubrics.yaml

@@ -0,0 +1,4 @@
+rubrics:
+  - id: r
+    title: R
+    criteria: []

domain-packs/missing-dependency/concepts.yaml

@@ -0,0 +1,5 @@
+concepts:
+  - id: x
+    title: X
+    prerequisites: []
+    mastery_signals: []

domain-packs/missing-dependency/pack.yaml

@@ -0,0 +1,13 @@
+name: missing-dependency
+display_name: Missing Dependency Pack
+version: 0.1.0
+schema_version: "1"
+didactopus_min_version: 0.1.0
+didactopus_max_version: 0.9.99
+description: Depends on something not installed.
+author: Wesley R. Elsberry
+license: MIT
+dependencies:
+  - name: nonexistent-pack
+    min_version: 1.0.0
+    max_version: 2.0.0

domain-packs/missing-dependency/projects.yaml

@@ -0,0 +1,6 @@
+projects:
+  - id: p
+    title: P
+    difficulty: introductory
+    prerequisites: [x]
+    deliverables: []

domain-packs/missing-dependency/roadmap.yaml

@@ -0,0 +1,5 @@
+stages:
+  - id: stage-1
+    title: X
+    concepts: [x]
+    checkpoint: []

domain-packs/missing-dependency/rubrics.yaml

@@ -0,0 +1,4 @@
+rubrics:
+  - id: r
+    title: R
+    criteria: []

pyproject.toml

@@ -9,29 +9,14 @@ description = "Didactopus: local-first AI-assisted autodidactic mastery platform
 readme = "README.md"
 requires-python = ">=3.10"
 license = {text = "MIT"}
-authors = [
-  {name = "Wesley R. Elsberry"}
-]
-dependencies = [
-  "pydantic>=2.7",
-  "pyyaml>=6.0",
-  "networkx>=3.2"
-]
+authors = [{name = "Wesley R. Elsberry"}]
+dependencies = ["pydantic>=2.7", "pyyaml>=6.0", "networkx>=3.2"]
 
 [project.optional-dependencies]
-dev = [
-  "pytest>=8.0",
-  "ruff>=0.6"
-]
+dev = ["pytest>=8.0", "ruff>=0.6"]
 
 [project.scripts]
 didactopus = "didactopus.main:main"
 
 [tool.setuptools.packages.find]
 where = ["src"]
-
-[tool.pytest.ini_options]
-testpaths = ["tests"]
-
-[tool.ruff]
-line-length = 100

src/didactopus/__init__.py

@@ -1,11 +1,16 @@
+__version__ = "0.1.0"
+
 __all__ = [
+    "__version__",
+    "artifact_registry",
+    "artifact_schemas",
     "config",
-    "model_provider",
-    "domain_map",
     "curriculum",
+    "domain_map",
+    "evaluation",
+    "main",
     "mentor",
+    "model_provider",
     "practice",
     "project_advisor",
-    "evaluation",
-    "artifact_registry",
 ]

src/didactopus/artifact_registry.py

@@ -1,28 +1,192 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, field
 from pathlib import Path
-from pydantic import BaseModel
+from typing import Any
 import yaml
 
+from . import __version__ as DIDACTOPUS_VERSION
+from .artifact_schemas import (
+    ConceptsFile,
+    PackManifest,
+    ProjectsFile,
+    RoadmapFile,
+    RubricsFile,
+    validate_top_level_key,
+)
 
-class ArtifactManifest(BaseModel):
-    name: str
-    display_name: str
-    version: str
-    schema_version: str
-    description: str = ""
-    author: str = ""
-    license: str = "unspecified"
+REQUIRED_FILES = ["pack.yaml", "concepts.yaml", "roadmap.yaml", "projects.yaml", "rubrics.yaml"]
 
 
-def discover_domain_packs(base_dirs: list[str | Path]) -> list[tuple[Path, ArtifactManifest]]:
-    packs: list[tuple[Path, ArtifactManifest]] = []
+def _parse_version(version: str) -> tuple[int, ...]:
+    parts = []
+    for chunk in version.split("."):
+        digits = "".join(ch for ch in chunk if ch.isdigit())
+        parts.append(int(digits) if digits else 0)
+    return tuple(parts)
+
+
+def _version_in_range(version: str, min_version: str, max_version: str) -> bool:
+    v = _parse_version(version)
+    vmin = _parse_version(min_version)
+    vmax = _parse_version(max_version)
+    return vmin <= v <= vmax
+
+
+@dataclass
+class PackValidationResult:
+    pack_dir: Path
+    manifest: PackManifest | None = None
+    is_valid: bool = False
+    errors: list[str] = field(default_factory=list)
+    loaded_files: dict[str, Any] = field(default_factory=dict)
+
+
+def _load_yaml(path: Path) -> dict[str, Any]:
+    data = yaml.safe_load(path.read_text(encoding="utf-8"))
+    if data is None:
+        return {}
+    if not isinstance(data, dict):
+        raise ValueError(f"{path.name} must contain a YAML mapping at top level")
+    return data
+
+
+def _check_duplicate_ids(entries: list[Any], label: str) -> list[str]:
+    errors: list[str] = []
+    seen: set[str] = set()
+    for entry in entries:
+        entry_id = entry.id
+        if entry_id in seen:
+            errors.append(f"duplicate {label} id: {entry_id}")
+        seen.add(entry_id)
+    return errors
+
+
+def _check_concept_references(concepts_file: ConceptsFile, roadmap_file: RoadmapFile, projects_file: ProjectsFile) -> list[str]:
+    errors: list[str] = []
+    concept_ids = {c.id for c in concepts_file.concepts}
+
+    for concept in concepts_file.concepts:
+        for prereq in concept.prerequisites:
+            if prereq not in concept_ids:
+                errors.append(
+                    f"unknown concept prerequisite '{prereq}' referenced by concept '{concept.id}'"
+                )
+
+    for stage in roadmap_file.stages:
+        for concept_id in stage.concepts:
+            if concept_id not in concept_ids:
+                errors.append(
+                    f"unknown concept '{concept_id}' referenced by roadmap stage '{stage.id}'"
+                )
+
+    for project in projects_file.projects:
+        for prereq in project.prerequisites:
+            if prereq not in concept_ids:
+                errors.append(
+                    f"unknown concept prerequisite '{prereq}' referenced by project '{project.id}'"
+                )
+
+    return errors
+
+
+def _check_core_compatibility(manifest: PackManifest) -> list[str]:
+    if _version_in_range(DIDACTOPUS_VERSION, manifest.didactopus_min_version, manifest.didactopus_max_version):
+        return []
+    return [
+        "incompatible with Didactopus core version "
+        f"{DIDACTOPUS_VERSION}; supported range is "
+        f"{manifest.didactopus_min_version}..{manifest.didactopus_max_version}"
+    ]
+
+
+def validate_pack(pack_dir: str | Path) -> PackValidationResult:
+    pack_path = Path(pack_dir)
+    result = PackValidationResult(pack_dir=pack_path)
+
+    for filename in REQUIRED_FILES:
+        if not (pack_path / filename).exists():
+            result.errors.append(f"missing required file: {filename}")
+    if result.errors:
+        return result
+
+    try:
+        result.manifest = PackManifest.model_validate(_load_yaml(pack_path / "pack.yaml"))
+        result.errors.extend(_check_core_compatibility(result.manifest))
+
+        concepts_data = _load_yaml(pack_path / "concepts.yaml")
+        result.errors.extend(validate_top_level_key(concepts_data, "concepts"))
+        concepts_file = None
+        if "concepts" in concepts_data:
+            concepts_file = ConceptsFile.model_validate(concepts_data)
+            result.loaded_files["concepts"] = concepts_file
+            result.errors.extend(_check_duplicate_ids(concepts_file.concepts, "concept"))
+
+        roadmap_data = _load_yaml(pack_path / "roadmap.yaml")
+        result.errors.extend(validate_top_level_key(roadmap_data, "stages"))
+        roadmap_file = None
+        if "stages" in roadmap_data:
+            roadmap_file = RoadmapFile.model_validate(roadmap_data)
+            result.loaded_files["roadmap"] = roadmap_file
+            result.errors.extend(_check_duplicate_ids(roadmap_file.stages, "roadmap stage"))
+
+        projects_data = _load_yaml(pack_path / "projects.yaml")
+        result.errors.extend(validate_top_level_key(projects_data, "projects"))
+        projects_file = None
+        if "projects" in projects_data:
+            projects_file = ProjectsFile.model_validate(projects_data)
+            result.loaded_files["projects"] = projects_file
+            result.errors.extend(_check_duplicate_ids(projects_file.projects, "project"))
+
+        rubrics_data = _load_yaml(pack_path / "rubrics.yaml")
+        result.errors.extend(validate_top_level_key(rubrics_data, "rubrics"))
+        if "rubrics" in rubrics_data:
+            rubrics_file = RubricsFile.model_validate(rubrics_data)
+            result.loaded_files["rubrics"] = rubrics_file
+            result.errors.extend(_check_duplicate_ids(rubrics_file.rubrics, "rubric"))
+
+        if concepts_file and roadmap_file and projects_file:
+            result.errors.extend(_check_concept_references(concepts_file, roadmap_file, projects_file))
+
+    except Exception as exc:
+        result.errors.append(str(exc))
+
+    result.is_valid = not result.errors
+    return result
+
+
+def discover_domain_packs(base_dirs: list[str | Path]) -> list[PackValidationResult]:
+    results: list[PackValidationResult] = []
     for base_dir in base_dirs:
-        base_path = Path(base_dir)
-        if not base_path.exists():
+        base = Path(base_dir)
+        if not base.exists():
             continue
-        for pack_dir in sorted(p for p in base_path.iterdir() if p.is_dir()):
-            manifest_path = pack_dir / "pack.yaml"
-            if not manifest_path.exists():
+        for pack_dir in sorted(p for p in base.iterdir() if p.is_dir()):
+            results.append(validate_pack(pack_dir))
+    return results
+
+
+def check_pack_dependencies(results: list[PackValidationResult]) -> list[str]:
+    errors: list[str] = []
+    manifest_by_name = {
+        r.manifest.name: r.manifest
+        for r in results
+        if r.manifest is not None
+    }
+
+    for result in results:
+        if result.manifest is None:
+            continue
+        for dep in result.manifest.dependencies:
+            dep_manifest = manifest_by_name.get(dep.name)
+            if dep_manifest is None:
+                errors.append(
+                    f"pack '{result.manifest.name}' depends on missing pack '{dep.name}'"
+                )
                 continue
-            data = yaml.safe_load(manifest_path.read_text(encoding="utf-8")) or {}
-            packs.append((pack_dir, ArtifactManifest.model_validate(data)))
-    return packs
+            if not _version_in_range(dep_manifest.version, dep.min_version, dep.max_version):
+                errors.append(
+                    f"pack '{result.manifest.name}' requires '{dep.name}' version "
+                    f"{dep.min_version}..{dep.max_version}, but found {dep_manifest.version}"
+                )
+    return errors

src/didactopus/artifact_schemas.py

@@ -0,0 +1,69 @@
+from typing import Any
+from pydantic import BaseModel, Field
+
+
+class DependencySpec(BaseModel):
+    name: str
+    min_version: str = "0.0.0"
+    max_version: str = "9999.9999.9999"
+
+
+class PackManifest(BaseModel):
+    name: str
+    display_name: str
+    version: str
+    schema_version: str
+    didactopus_min_version: str
+    didactopus_max_version: str
+    description: str = ""
+    author: str = ""
+    license: str = "unspecified"
+    dependencies: list[DependencySpec] = Field(default_factory=list)
+
+
+class ConceptEntry(BaseModel):
+    id: str
+    title: str
+    prerequisites: list[str] = Field(default_factory=list)
+    mastery_signals: list[str] = Field(default_factory=list)
+
+
+class ConceptsFile(BaseModel):
+    concepts: list[ConceptEntry]
+
+
+class RoadmapStageEntry(BaseModel):
+    id: str
+    title: str
+    concepts: list[str] = Field(default_factory=list)
+    checkpoint: list[str] = Field(default_factory=list)
+
+
+class RoadmapFile(BaseModel):
+    stages: list[RoadmapStageEntry]
+
+
+class ProjectEntry(BaseModel):
+    id: str
+    title: str
+    difficulty: str = ""
+    prerequisites: list[str] = Field(default_factory=list)
+    deliverables: list[str] = Field(default_factory=list)
+
+
+class ProjectsFile(BaseModel):
+    projects: list[ProjectEntry]
+
+
+class RubricEntry(BaseModel):
+    id: str
+    title: str
+    criteria: list[str] = Field(default_factory=list)
+
+
+class RubricsFile(BaseModel):
+    rubrics: list[RubricEntry]
+
+
+def validate_top_level_key(data: dict[str, Any], required_key: str) -> list[str]:
+    return [] if required_key in data else [f"missing required top-level key: {required_key}"]

src/didactopus/curriculum.py

@@ -10,12 +10,11 @@ class RoadmapStage:
 
 
 def generate_initial_roadmap(domain_map: DomainMap, goal: str) -> list[RoadmapStage]:
-    sequence = domain_map.topological_sequence()
     return [
         RoadmapStage(
-            title=f"Stage {idx + 1}: {concept.title()}",
+            title=f"Stage {i+1}: {concept.title()}",
             concepts=[concept],
             mastery_goal=f"Demonstrate applied understanding of {concept} toward goal: {goal}",
         )
-        for idx, concept in enumerate(sequence)
+        for i, concept in enumerate(domain_map.topological_sequence())
     ]

src/didactopus/domain_map.py

@@ -7,7 +7,6 @@ class ConceptNode:
     name: str
     description: str = ""
     prerequisites: list[str] = field(default_factory=list)
-    representative_tasks: list[str] = field(default_factory=list)
 
 
 class DomainMap:
@@ -20,9 +19,6 @@ class DomainMap:
         for prereq in node.prerequisites:
             self.graph.add_edge(prereq, node.name)
 
-    def concepts(self) -> list[str]:
-        return list(self.graph.nodes)
-
     def prerequisites_for(self, concept: str) -> list[str]:
         return list(nx.ancestors(self.graph, concept))
 

src/didactopus/evaluation.py

@@ -2,8 +2,6 @@ from .model_provider import ModelProvider
 
 
 def generate_rubric(provider: ModelProvider, concept: str) -> str:
-    prompt = (
-        f"Create a concise evaluation rubric for learner mastery of '{concept}'. "
-        f"Assess explanation quality, problem solving, and transfer."
-    )
-    return provider.generate(prompt).text
+    return provider.generate(
+        f"Create a concise evaluation rubric for mastery of '{concept}'."
+    ).text

src/didactopus/main.py

@@ -2,25 +2,24 @@ import argparse
 import os
 from pathlib import Path
 
+from .artifact_registry import check_pack_dependencies, discover_domain_packs
 from .config import load_config
-from .model_provider import ModelProvider
-from .artifact_registry import discover_domain_packs
-from .domain_map import build_demo_domain_map
 from .curriculum import generate_initial_roadmap
+from .domain_map import build_demo_domain_map
+from .evaluation import generate_rubric
 from .mentor import generate_socratic_prompt
+from .model_provider import ModelProvider
 from .practice import generate_practice_task
 from .project_advisor import suggest_capstone
-from .evaluation import generate_rubric
 
 
 def build_parser() -> argparse.ArgumentParser:
     parser = argparse.ArgumentParser(description="Didactopus mastery scaffold")
-    parser.add_argument("--domain", required=True, help="Target domain of study")
-    parser.add_argument("--goal", required=True, help="Learning goal")
+    parser.add_argument("--domain", required=True)
+    parser.add_argument("--goal", required=True)
     parser.add_argument(
         "--config",
         default=os.environ.get("DIDACTOPUS_CONFIG", "configs/config.example.yaml"),
-        help="Path to configuration YAML",
     )
     return parser
 
@@ -30,44 +29,34 @@ def main() -> None:
     config = load_config(Path(args.config))
     provider = ModelProvider(config.model_provider)
     packs = discover_domain_packs(config.artifacts.local_pack_dirs)
+    dependency_errors = check_pack_dependencies(packs)
 
     dmap = build_demo_domain_map(args.domain)
     roadmap = generate_initial_roadmap(dmap, args.goal)
+    focus_concept = dmap.topological_sequence()[1]
 
     print("== Didactopus ==")
     print("Many arms, one goal — mastery.")
     print()
-    print("== Provider ==")
-    print(provider.describe())
+    print("== Domain Pack Validation ==")
+    for pack in packs:
+        pack_name = pack.manifest.display_name if pack.manifest else pack.pack_dir.name
+        print(f"- {pack_name}: {'valid' if pack.is_valid else 'INVALID'}")
+        for err in pack.errors:
+            print(f"  * {err}")
     print()
-    print("== Installed Domain Packs ==")
-    if packs:
-        for pack_dir, manifest in packs:
-            print(f"- {manifest.display_name} ({manifest.name} {manifest.version}) @ {pack_dir}")
+    print("== Dependency Resolution ==")
+    if dependency_errors:
+        for err in dependency_errors:
+            print(f"- {err}")
     else:
-        print("- none found")
-    print()
-    print("== Domain Map Sequence ==")
-    for concept in dmap.topological_sequence():
-        print(f"- {concept}")
+        print("- all resolved")
     print()
     print("== Roadmap ==")
     for stage in roadmap:
         print(f"- {stage.title}: {stage.mastery_goal}")
     print()
-    focus_concept = dmap.topological_sequence()[1]
-    print("== Mentor Prompt ==")
     print(generate_socratic_prompt(provider, focus_concept))
-    print()
-    print("== Practice Task ==")
     print(generate_practice_task(provider, focus_concept))
-    print()
-    print("== Capstone Suggestion ==")
     print(suggest_capstone(provider, args.domain))
-    print()
-    print("== Evaluation Rubric ==")
     print(generate_rubric(provider, focus_concept))
-
-
-if __name__ == "__main__":
-    main()

src/didactopus/mentor.py

@@ -2,8 +2,6 @@ from .model_provider import ModelProvider
 
 
 def generate_socratic_prompt(provider: ModelProvider, concept: str) -> str:
-    prompt = (
-        f"You are a Socratic mentor. Ask one probing question that tests whether a learner "
-        f"truly understands the concept '{concept}' and can explain it in their own words."
-    )
-    return provider.generate(prompt).text
+    return provider.generate(
+        f"You are a Socratic mentor. Ask one probing question about '{concept}'."
+    ).text

src/didactopus/practice.py

@@ -2,8 +2,6 @@ from .model_provider import ModelProvider
 
 
 def generate_practice_task(provider: ModelProvider, concept: str) -> str:
-    prompt = (
-        f"Generate one practice task for the concept '{concept}'. Require reasoning, "
-        f"not mere recall, and avoid giving the answer."
-    )
-    return provider.generate(prompt).text
+    return provider.generate(
+        f"Generate one reasoning-heavy practice task for '{concept}'."
+    ).text

src/didactopus/project_advisor.py

@@ -2,8 +2,6 @@ from .model_provider import ModelProvider
 
 
 def suggest_capstone(provider: ModelProvider, domain: str) -> str:
-    prompt = (
-        f"Suggest one realistic capstone project for a learner pursuing mastery in {domain}. "
-        f"The project must require synthesis, verification, and original work."
-    )
-    return provider.generate(prompt).text
+    return provider.generate(
+        f"Suggest one realistic capstone project for mastery in {domain}."
+    ).text

tests/test_artifact_registry.py

@@ -1,9 +1,31 @@
-from didactopus.artifact_registry import discover_domain_packs
+from didactopus.artifact_registry import (
+    _version_in_range,
+    check_pack_dependencies,
+    discover_domain_packs,
+    validate_pack,
+)
 
 
-def test_discover_example_pack() -> None:
-    packs = discover_domain_packs(["domain-packs"])
-    assert len(packs) >= 1
-    _, manifest = packs[0]
-    assert manifest.name == "example-statistics"
-    assert manifest.display_name == "Example Statistics Pack"
+def test_version_range() -> None:
+    assert _version_in_range("1.2.0", "1.0.0", "1.9.9") is True
+    assert _version_in_range("2.0.0", "1.0.0", "1.9.9") is False
+
+
+def test_foundations_pack_is_valid() -> None:
+    result = validate_pack("domain-packs/foundations-statistics")
+    assert result.is_valid is True
+    assert result.manifest is not None
+    assert result.manifest.name == "foundations-statistics"
+
+
+def test_incompatible_core_pack_is_invalid() -> None:
+    result = validate_pack("domain-packs/incompatible-core")
+    assert result.is_valid is False
+    assert any("incompatible with Didactopus core version" in err for err in result.errors)
+
+
+def test_dependency_resolution() -> None:
+    results = discover_domain_packs(["domain-packs"])
+    errors = check_pack_dependencies(results)
+    assert any("depends on missing pack 'nonexistent-pack'" in err for err in errors)
+    assert not any("bayes-extension" in err for err in errors and "foundations-statistics" in err)