managing-spx

<objective> Single source of truth for spx/ directory structure and all document templates. Enables creation of requirements (PRD), decisions (ADR for architecture, PDR for product), and work items (capability/feature/story) with consistent structure across all products using the SPX framework. </objective> <prerequisite> **Foundational understanding required:**

• /understanding-durable-map - Specs are permanent product documentation, not work items
• /understanding-outcome-decomposition - What belongs at each level (capability/feature/story)

If you find yourself wanting to "close" items or thinking in tasks, read these first. </prerequisite>

<quick_start> Different use cases read different sections:

• Template access → Read <accessing_templates> FIRST to understand where templates are located
• Structure definition → Read <structure_definition> for spx/ directory hierarchy, BSP numbering, test co-location
• ADR templates → Read <adr_templates> for Architectural Decision Record patterns
• PDR templates → Read <pdr_templates> for Product Decision Record patterns
• PRD templates → Read <requirement_templates> for Product Requirements
• Work item templates → Read <work_item_templates> for capability, feature, and story patterns

Use progressive disclosure - read only what you need. </quick_start>

<accessing_templates>

<how_to_access> All templates are stored within this skill's base directory.

When this skill is invoked, you are provided the base directory in the loading message:

Base directory for this skill: {skill_dir}

Use this exact path for all file access. Throughout this documentation, ${SKILL_DIR} is a placeholder—Claude must substitute it manually from the loading message.

IMPORTANT: Do NOT search the project directory for skill files. </how_to_access>

<template_organization>

All templates are under ${SKILL_DIR}/templates/:

${SKILL_DIR}/
├── SKILL.md                                    # This file
└── templates/
    ├── product/
    │   └── product.prd.md
    ├── decisions/
    │   ├── architectural-decision.adr.md
    │   └── product-decision.pdr.md
    └── outcomes/
        ├── capability-name.capability.md
        ├── feature-name.feature.md
        └── story-name.story.md

</template_organization>

<how_to_read_templates>

Always use the skill's base directory, not the user's project directory.

# Pattern
Read: ${SKILL_DIR}/templates/{category}/{template-name}

# Example: Read feature template
Read: ${SKILL_DIR}/templates/outcomes/feature-name.feature.md

</how_to_read_templates>

</accessing_templates>

<structure_definition>

<overview> The spx/ directory follows the Outcome Engineering framework structure. </overview>

<three_phase_transformation>

1. Requirements (PRD) - Capture product vision without implementation constraints
2. Decisions (ADR/PDR) - Constrain architecture (ADR) or product behavior (PDR) with explicit trade-offs
3. Work Items (Capability/Feature/Story) - Sized, testable implementation containers

</three_phase_transformation>

<directory_structure>

spx/
├── {product-name}.prd.md             # Product requirements
├── NN-{slug}.adr.md                  # Product-wide ADRs (interleaved)
├── NN-{slug}.pdr.md                  # Product-wide PDRs (interleaved)
└── NN-{slug}.capability/
    ├── {slug}.capability.md
    ├── tests/
    ├── NN-{slug}.adr.md              # Capability-scoped ADRs (interleaved)
    ├── NN-{slug}.pdr.md              # Capability-scoped PDRs (interleaved)
    └── NN-{slug}.feature/
        ├── {slug}.feature.md
        ├── tests/
        ├── NN-{slug}.adr.md          # Feature-scoped ADRs (interleaved)
        ├── NN-{slug}.pdr.md          # Feature-scoped PDRs (interleaved)
        └── NN-{slug}.story/
            ├── {slug}.story.md
            └── tests/

</directory_structure>

<work_item_hierarchy>

• Capability: Product-wide impact, contains features

  • Tests co-located in spx/NN-{slug}.capability/tests/
  • May have optional PRD as catalyst/enrichment

• Feature: Specific functionality, contains stories

  • Tests co-located in spx/.../NN-{slug}.feature/tests/
  • Technical details documented in feature.md (no separate TRD)

• Story: Atomic implementation unit, no children

  • Tests co-located in spx/.../NN-{slug}.story/tests/

Test level (unit, integration, e2e) is determined per-component by the evidence needed, not by hierarchy level. See /testing for the methodology.

</work_item_hierarchy>

<key_principles>

• Requirements immutable - code adapts to requirements, not vice versa
• BSP numbering: Binary Space Partitioning encodes dependency order—lower BSP items are dependencies that higher-BSP items may rely on; same BSP means independent
• Full paths required: BSP numbers repeat at different levels (see <bsp_full_paths> below)
• Test co-location: Tests stay in spx/.../tests/ permanently (no graduation)

</key_principles>

<bsp_full_paths>

🚨 CRITICAL: BSP numbers repeat at different levels—always use full paths.

21-foo.capability/21-bar.feature/54-baz.story/  ← One story-54
21-foo.capability/37-qux.feature/54-baz.story/  ← DIFFERENT story-54
37-other.capability/21-bar.feature/54-baz.story/  ← DIFFERENT story-54

ALWAYS use the FULL PATH when referencing work items:

❌ WRONG (Ambiguous)	✅ CORRECT (Unambiguous)
"story-54"	"21-foo.capability/21-bar.feature/54-baz.story/"
"implement feature-21"	"implement 21-foo.capability/21-bar.feature/"
"Continue with story-54"	"Continue 21-foo.capability/21-bar.feature/54-baz.story/"

Why this matters:

• BSP numbers encode dependency order within each level, not global uniqueness
• Different capabilities can have identically-numbered features
• Different features can have identically-numbered stories
• Without the full path, agents will access the WRONG work item

When communicating about work items:

1. Always include the full hierarchy path
2. Never use bare numbers like "story-54" without context
3. When in doubt, use the absolute path from spx/

</bsp_full_paths>

</structure_definition>

<workflow>

<reading_status>

<understanding_work_items>

<three_states> Status values:

State	Meaning
OPEN	Work not started
IN_PROGRESS	Work underway
DONE	Complete

</three_states>

<bsp_dependency_order>

Lower BSP = dependency. Higher-BSP items may rely on lower-BSP items.

Check dependencies before working on an item—lower-numbered items in the same scope may need to be done first.

This applies at every level:

If you see...	It means...
48-foo.feature/ before 87-bar.feature/	48-foo MUST be DONE before 87-bar starts
21-foo.story/ before 32-bar.story/	21-foo MUST be DONE before 32-bar starts
48-foo [OPEN], 87-bar [IN_PROGRESS]	BUG: Dependency violation

</bsp_dependency_order>

<finding_next_work_item>

1. List all work items in BSP order (capability → feature → story)
2. Return the FIRST item where status ≠ DONE
3. That item blocks everything after it

Example:

48-test-harness.feature/ [OPEN]        ← Was added after 87 but blocks it
87-e2e-workflow.feature/ [IN_PROGRESS] ← Was already started, then dependency discovered

Next work item: 48-test-harness.feature/ → its first OPEN story.

</finding_next_work_item>

</understanding_work_items>

</reading_status>

<managing_items>

<managing_work_items>

<numbering_work_items>

<bsp_numbering> Two-digit prefixes in range [10, 99] encode dependency order. </bsp_numbering>

<creating_new_items>

<case_1_first_item>

Use position 21 (leaves room for ~10 items before/after):

# First feature in a new capability
21-foo.capability/
└── 21-first-feature.feature/

</case_1_first_item>

<case_2_insert_between>

Use midpoint: new = floor((left + right) / 2)

# Insert between 21 and 54
new = floor((21 + 54) / 2) = 37

21-first.feature/
37-inserted.feature/    ← NEW
54-second.feature/

</case_2_insert_between>

<case_3_append_after>

Use midpoint to upper bound: new = floor((last + 99) / 2)

# Append after 54
new = floor((54 + 99) / 2) = 76

21-first.feature/
54-second.feature/
76-appended.feature/    ← NEW

</case_3_append_after>

</creating_new_items>

</numbering_work_items>

<creating_work_items> Every work item needs:

1. Directory: NN-{slug}.{type}/ (e.g., 21-auth.capability/)
2. Spec file: {slug}.{type}.md (e.g., auth.capability.md)
3. Tests directory: tests/ (create when starting work)

Optional:

• Decision Records: NN-{slug}.adr.md or NN-{slug}.pdr.md (interleaved with work items)

</creating_work_items>

</managing_work_items>

</managing_items>

</workflow>

<adr_templates>

<overview> ADRs document technical choices with trade-offs and consequences. </overview>

<template_location>

${SKILL_DIR}/templates/decisions/architectural-decision.adr.md

</template_location>

<usage>

Read the template and adapt:

# Read ADR template
Read: ${SKILL_DIR}/templates/decisions/architectural-decision.adr.md

# Adapt for your decision
- State the architectural concern this decision governs (atemporal voice — no history)
- Document the chosen option and rationale
- Specify consequences and trade-offs
- Define compliance criteria

</usage>

<scope_levels>

ADRs are interleaved with work items at any level:

• Product: spx/NN-{slug}.adr.md
• Capability: spx/NN-{slug}.capability/NN-{slug}.adr.md
• Feature: spx/.../NN-{slug}.feature/NN-{slug}.adr.md

Stories inherit decisions from parent feature/capability.

</scope_levels>

<naming_convention>

Format: NN-{slug}.adr.md

• NN: BSP number in range [10, 99]
• slug: Kebab-case description (e.g., use-postgresql-for-persistence)

</naming_convention>

<bsp_numbering_for_adrs>

Lower BSP = dependency. Higher-BSP ADRs may rely on lower-BSP decisions.

ADRs follow the same BSP numbering as work items:

<creating_first_adr>

Use position 21 (leaves room for ~10 items before/after):

21-first-decision.adr.md

</creating_first_adr>

<inserting_between_adrs>

Use midpoint: new = floor((left + right) / 2)

# Insert between 21 and 54
new = floor((21 + 54) / 2) = 37

21-type-safety.adr.md
37-inserted-decision.adr.md    ← NEW
54-cli-framework.adr.md

</inserting_between_adrs>

<appending_after_last>

Use midpoint to upper bound: new = floor((last + 99) / 2)

# Append after 54
new = floor((54 + 99) / 2) = 76

21-type-safety.adr.md
54-cli-framework.adr.md
76-appended-decision.adr.md    ← NEW

</appending_after_last>

</bsp_numbering_for_adrs>

<dependency_order_within_scope>

Scope boundaries: ADRs are scoped to product/capability/feature.

Within scope: Lower BSP = dependency that higher-BSP items may rely on.

If you see...	It means...
21-type-safety.adr.md	Foundational decision, others may depend
37-validation.adr.md	May depend on 21
54-cli-framework.adr.md	May depend on both 21 and 37

Cross-scope dependencies: Must be documented explicitly in the ADR content.

Dependency	How to Express
Feature ADR depends on capability ADR	Reference in "Context" section with link
Capability ADR depends on product ADR	Reference in "Context" section with link

</dependency_order_within_scope>

<why_bsp_numbering>

Problem: Sequential numbering (01, 02, 03) cannot accommodate discovered dependencies.

Example: You have decisions adr-01, adr-02, adr-03. You discover adr-02 needs a prior decision about type safety. With sequential numbering, you must renumber all subsequent ADRs.

Solution: BSP numbering allows insertion at any point using midpoint calculation.

</why_bsp_numbering>

<why_no_numbers_in_content>

Problem: If ADR file is renumbered (e.g., adr-23 → adr-37), content with embedded numbers becomes stale.

Examples:

• Header # ADR 23: Foo - wrong after renumbering
• Reference "See ADR-23" - wrong after renumbering

Solution:

• Header: # ADR: Foo (document type prefix, no number)
• References: [Foo](37-foo.adr.md) (markdown link with path)
• Filenames can be renamed, slugs stay stable, markdown links update automatically

</why_no_numbers_in_content>

<why_markdown_links_only>

Problem: Plain text references like "ADR-23" or even `23-foo.adr.md` break when files are renumbered.

Solution: Markdown links [Decision Title](NN-slug.adr.md):

• Modern editors update links automatically on file rename
• Links are clickable for navigation
• Slug provides stability even if number changes
• Can search by slug if link breaks

</why_markdown_links_only>

</adr_templates>

<pdr_templates>

<overview> PDRs document product behavior decisions with trade-offs and user impact. Unlike ADRs (which govern code architecture), PDRs govern observable product behavior. </overview>

<template_location>

${SKILL_DIR}/templates/decisions/product-decision.pdr.md

</template_location>

<usage>

Read the template and adapt:

# Read PDR template
Read: ${SKILL_DIR}/templates/decisions/product-decision.pdr.md

# Adapt for your decision
- State the product behavior this decision governs (atemporal voice — no history)
- Describe the chosen product behavior
- List product invariants users can rely on
- Specify compliance criteria for product behavior

</usage>

<scope_levels>

PDRs are interleaved with work items at any level:

• Product: spx/NN-{slug}.pdr.md
• Capability: spx/NN-{slug}.capability/NN-{slug}.pdr.md
• Feature: spx/.../NN-{slug}.feature/NN-{slug}.pdr.md

Stories inherit product decisions from parent feature/capability.

</scope_levels>

<naming_convention>

Format: NN-{slug}.pdr.md

• NN: BSP number in range [10, 99]
• slug: Kebab-case description (e.g., simulation-lifecycle-phases)

</naming_convention>

<adr_vs_pdr>

Aspect	ADR	PDR
Governs	Code architecture	Product behavior
Invariants	Algebraic code properties	Observable user guarantees
Compliance	Code review criteria	Product behavior validation
Example	"Use PostgreSQL for persistence"	"Simulation has three phases"

When to use which:

• Technical implementation choice → ADR
• User-facing behavior choice → PDR
• If unsure, ask: "Is this about HOW we build it (ADR) or WHAT users experience (PDR)?"

</adr_vs_pdr>

</pdr_templates>

<referencing_decisions>

<overview> **Always use markdown links with descriptive titles for both ADRs and PDRs.** </overview>

<in_markdown_documents>

<within_same_directory>

See [Type Safety](21-type-safety.adr.md) for validation approach.

</within_same_directory>

<from_child_to_parent_scope>

<!-- Feature ADR referencing capability ADR -->

This decision builds on [Config Loading](../21-config-loading.adr.md).

<!-- Story referencing feature ADR -->

Implementation follows [CLI Structure](../21-cli-structure.adr.md).

</from_child_to_parent_scope>

<from_work_item_to_adr>

<!-- From story to capability ADR -->

Architectural constraints: [Commander Pattern](../../21-commander-pattern.adr.md)

<!-- From feature to product ADR -->

Type system: [Type Safety](../../../21-type-safety.adr.md)

</from_work_item_to_adr>

</in_markdown_documents>

<never_use_these_formats>

❌ Plain text reference: "See ADR-21" or "See PDR-21" ❌ Code-only reference: `21-type-safety.adr.md` or `21-lifecycle.pdr.md` ❌ Number-only reference: "ADR 21 specifies..." or "PDR 21 specifies..."

</never_use_these_formats>

<why_markdown_links>

• Clickable: Navigate directly in editors/viewers
• Stable: Slug provides stability even if number changes
• Updatable: Modern editors can update links on file rename
• Descriptive: Title provides context without opening file

</why_markdown_links>

</referencing_decisions>

<requirement_templates>

<overview> Templates for Product Requirements (PRD). </overview>

<prd_template>

Location: ${SKILL_DIR}/templates/product/product.prd.md

Purpose: Product requirements - user value, customer journey, measurable outcomes

Usage:

# Read PRD template
Read: ${SKILL_DIR}/templates/product/product.prd.md

# Adapt for product change
- Define user value proposition
- Document measurable outcomes with targets
- Specify acceptance criteria
- Avoid implementation details

Placement:

• Product-wide: spx/{product-name}.prd.md
• Capability catalyst: spx/NN-{slug}.capability/{topic}.prd.md

</prd_template>

<requirements_rules>

• Immutable: Code adapts to requirements, not vice versa
• Optional catalyst: PRD may exist as enrichment; spec file is always required
• No TRDs: Technical details belong in feature.md, not separate documents

</requirements_rules>

</requirement_templates>

<work_item_templates>

<overview> Templates for capabilities, features, and stories. </overview>

<template_locations>

${SKILL_DIR}/templates/outcomes/capability-name.capability.md
${SKILL_DIR}/templates/outcomes/feature-name.feature.md
${SKILL_DIR}/templates/outcomes/story-name.story.md

</template_locations>

<usage_pattern>

# For capability
Read: ${SKILL_DIR}/templates/outcomes/capability-name.capability.md
Adapt: Replace {slug} with kebab-case name
       Fill functional requirements
       Add user value context

# For feature
Read: ${SKILL_DIR}/templates/outcomes/feature-name.feature.md
Adapt: Replace {slug} with kebab-case name
       Specify integration scope
       Define component interactions

# For story
Read: ${SKILL_DIR}/templates/outcomes/story-name.story.md
Adapt: Replace {slug} with kebab-case name
       Detail atomic implementation
       List specific functions/classes

</usage_pattern>

<file_placement>

Work items follow this pattern:

spx/{BSP}-{slug}.{type}/{slug}.{type}.md

Examples:

• spx/21-core-cli.capability/core-cli.capability.md
• spx/21-core-cli.capability/10-init.feature/init.feature.md
• spx/21-core-cli.capability/15-init.feature/87-parse-flags.story/parse-flags.story.md

</file_placement>

<test_verification>

Tests stay co-located with their specs permanently. Test level is indicated by filename suffix (.unit.test.*, .integration.test.*, .e2e.test.*) but is not tied to hierarchy level — any test level can appear at any node. See /testing for how to determine the right level.

</test_verification>

</work_item_templates>

<success_criteria> Skill is working correctly when:

• Templates exist and are readable in templates/ subdirectories
• Other skills can successfully read templates from appropriate sections
• Progressive disclosure guides readers to relevant sections
• ADR, PDR, requirement, and work item patterns are clearly documented
• Test co-location paths are correctly specified for each level
• BSP numbering uses consistent two-digit format (10-99)

</success_criteria>