fskill-creator-migrate
Goal
Analyze a large or hard-to-maintain legacy skill directory into structured migration context while preserving behavior. This sub-skill only performs migration pre-analysis and does not directly write final functional skill files; final artifact generation, runtime capability provisioning, file writing, and validation are handled by the main fskill-creator.
Invoked by the main skill when the user has an existing monolithic skill and wants to "refactor into functional", "migrate to functional skill", or "restructure into functions/references/scripts".
Principles
- Preserve existing behavior first, then optimize structure.
- Load the whole legacy skill package, not only
SKILL.md.
- Keep source section and file evidence so reviewers can trace migrated content.
- Only output
migration_context; must not directly write target skill files.
- Duplicated rules, schemas, and vocabulary move to
reference_plan.
- Existing
references/, scripts/, and tools/ are inventoried before proposing splits.
- Deterministic parsing, formatting, validation, or mechanical transforms are identified as
script_plan, to be generated or preserved later by the main skill.
- Optional viewers only enter
tool_plan; final files are generated uniformly by the main skill's add_runtime_capabilities.
References
| Resource |
Load Timing |
Purpose |
shared_glossary |
On demand |
Stable migration terminology and output fields. |
script_rules |
Before proposing scripts |
Rules for deciding what belongs in scripts/. |
External Inputs
| Field |
Source |
Description |
legacy_skill_dir |
user or repository |
Path to the legacy skill directory containing SKILL.md. |
legacy_skill_path |
user or repository |
Deprecated alias for legacy_skill_dir; may also be a direct path to SKILL.md, which resolves to its parent directory. |
legacy_skill_content |
user or repository |
Existing skill markdown content when the directory is inaccessible. |
migration_constraints |
user |
Constraints such as preserving file names, tone, or platform rules. |
known_testcases |
user or repository |
Existing examples, traces, or expected behaviors. |
existing_scripts |
repository |
Existing helper scripts associated with the legacy skill. |
include_viewers |
user |
Whether to suggest generating tools/log_viewer.mjs and tools/tester_viewer.mjs. |
script_runtime |
environment |
Whether this sub-skill's own Node.js scripts can be run. |
Execution Pipeline
| Step |
Function |
Purpose |
Input |
Output |
| 1 |
load_legacy_skill |
Load and normalize the legacy skill package. |
legacy_skill_dirlegacy_skill_pathlegacy_skill_content |
legacy_skill |
| 2 |
map_existing_behavior |
Identify goals, rules, inputs, outputs, and behaviors that must be preserved. |
legacy_skillmigration_constraints |
behavior_map |
| 3 |
propose_function_split |
Propose function boundaries, script opportunities, optional viewer tools, and target file layout. |
legacy_skillbehavior_mapscript_rulesinclude_viewersscript_runtime |
migration_proposalscript_plantool_plan |
| 4 |
extract_shared_references |
Move duplicated or shared rules into references. |
legacy_skillmigration_proposalscript_plan |
reference_plan |
Output
The main skill combines the above outputs into:
| Field |
Description |
migration_context.legacy_skill |
Loaded source skill package data. |
migration_context.behavior_map |
Behaviors that must be preserved. |
migration_context.migration_proposal |
Function split and target structure proposal. |
migration_context.reference_plan |
Terms, rules, and schemas that should go into shared references. |
migration_context.script_plan |
Deterministic helpers to generate, preserve, or refactor. |
migration_context.tool_plan |
Optional viewer choices. |
migration_context.source_evidence |
Legacy source sections, companion files, and behavior preservation evidence. |
Output Scope
Only output migration context; must not directly write target skill files or delete the legacy skill.
1---2name: fskill-creator-migrate3description: Migrate lane for fskill-creator; analyzes a legacy skill directory into behavior map, function split proposal, and source evidence.4---56# fskill-creator-migrate78## Goal910Analyze a large or hard-to-maintain legacy skill directory into structured migration context while preserving behavior. This sub-skill only performs migration pre-analysis and does not directly write final functional skill files; final artifact generation, runtime capability provisioning, file writing, and validation are handled by the main `fskill-creator`.1112Invoked by the main skill when the user has an existing monolithic skill and wants to "refactor into functional", "migrate to functional skill", or "restructure into functions/references/scripts".1314## Principles1516- Preserve existing behavior first, then optimize structure.17- Load the whole legacy skill package, not only `SKILL.md`.18- Keep source section and file evidence so reviewers can trace migrated content.19- Only output `migration_context`; must not directly write target skill files.20- Duplicated rules, schemas, and vocabulary move to `reference_plan`.21- Existing `references/`, `scripts/`, and `tools/` are inventoried before proposing splits.22- Deterministic parsing, formatting, validation, or mechanical transforms are identified as `script_plan`, to be generated or preserved later by the main skill.23- Optional viewers only enter `tool_plan`; final files are generated uniformly by the main skill's `add_runtime_capabilities`.2425## References2627| Resource | Load Timing | Purpose |28|---|---|---|29| `shared_glossary` | On demand | Stable migration terminology and output fields. |30| `script_rules` | Before proposing scripts | Rules for deciding what belongs in `scripts/`. |3132## External Inputs3334| Field | Source | Description |35|---|---|---|36| `legacy_skill_dir` | user or repository | Path to the legacy skill directory containing `SKILL.md`. |37| `legacy_skill_path` | user or repository | Deprecated alias for `legacy_skill_dir`; may also be a direct path to `SKILL.md`, which resolves to its parent directory. |38| `legacy_skill_content` | user or repository | Existing skill markdown content when the directory is inaccessible. |39| `migration_constraints` | user | Constraints such as preserving file names, tone, or platform rules. |40| `known_testcases` | user or repository | Existing examples, traces, or expected behaviors. |41| `existing_scripts` | repository | Existing helper scripts associated with the legacy skill. |42| `include_viewers` | user | Whether to suggest generating `tools/log_viewer.mjs` and `tools/tester_viewer.mjs`. |43| `script_runtime` | environment | Whether this sub-skill's own Node.js scripts can be run. |4445## Execution Pipeline4647| Step | Function | Purpose | Input | Output |48|---:|---|---|---|---|49| 1 | `load_legacy_skill` | Load and normalize the legacy skill package. | `legacy_skill_dir`<br>`legacy_skill_path`<br>`legacy_skill_content` | `legacy_skill` |50| 2 | `map_existing_behavior` | Identify goals, rules, inputs, outputs, and behaviors that must be preserved. | `legacy_skill`<br>`migration_constraints` | `behavior_map` |51| 3 | `propose_function_split` | Propose function boundaries, script opportunities, optional viewer tools, and target file layout. | `legacy_skill`<br>`behavior_map`<br>`script_rules`<br>`include_viewers`<br>`script_runtime` | `migration_proposal`<br>`script_plan`<br>`tool_plan` |52| 4 | `extract_shared_references` | Move duplicated or shared rules into references. | `legacy_skill`<br>`migration_proposal`<br>`script_plan` | `reference_plan` |5354## Output5556The main skill combines the above outputs into:5758| Field | Description |59|---|---|60| `migration_context.legacy_skill` | Loaded source skill package data. |61| `migration_context.behavior_map` | Behaviors that must be preserved. |62| `migration_context.migration_proposal` | Function split and target structure proposal. |63| `migration_context.reference_plan` | Terms, rules, and schemas that should go into shared references. |64| `migration_context.script_plan` | Deterministic helpers to generate, preserve, or refactor. |65| `migration_context.tool_plan` | Optional viewer choices. |66| `migration_context.source_evidence` | Legacy source sections, companion files, and behavior preservation evidence. |6768## Output Scope6970Only output migration context; must not directly write target skill files or delete the legacy skill.
AGI-comming