Plugin Creator

Plugin Creator

Core Philosophy

• Start minimal, then add only requested surfaces.
• Keep naming and manifest shape deterministic.

When to Use

Use for initial plugin scaffolding.

Inputs

• plugin name and destination scope
• optional marketplace update intent
• optional existing skill path to adopt by move

Outputs

Return: schema_version, plugin_name, plugin_path, validation, optional blocked_by.

For non-trivial plugins, also return factory_governance with plugin posture, visibility policy, traceability mode, budget posture, and risks.

Execution Boundaries

Create or adopt plugin-owned canonical source only. Do not edit generated runtime mirrors, user-level plugin copies, or marketplace projections as the source of truth.

Keep plugin scaffolding separate from skill hardening. Route detailed skill quality work to [[skill-builder]] after the plugin package has deterministic ownership, manifest policy, and validation evidence.

If the destination plugin root, marketplace ownership, or skill-adoption move semantics are ambiguous, stop and ask before writing.

Apply the OpenAI-style plugin design contract during scaffold shape decisions: keep the root-visible surface small, split child skills by distinct user intent, declare side-effect classes early, and leave confirmation behavior for install, external write, destructive, or completion-gating actions. Add bundled hooks only when lifecycle behavior is explicitly requested, and prefer hooks/hooks.json.

Workflow

Use the detailed scaffold procedure in references/workflow.md.

Apply the context-disposition policy: move important still-valid context to references, and intentionally discard stale, duplicated, unsafe, superseded, or low-signal text. Apply the context-disposition policy: move important still-valid context to references, and intentionally discard stale, duplicated, unsafe, superseded, or low-signal text. Classify reusable, delivery-oriented, visible-family, or coding-harness plugins with references/factory-governance-spine.md. Keep one-skill plugins minimal.

Read when:

• You need full plugin scaffold and marketplace update flow: references/workflow.md.
• You need plugin posture, visibility, budget, traceability, or session-evidence rules: references/factory-governance-spine.md.
• You need side-effect, context-minimization, user-control, or output-shape guidance: OpenAI-style plugin design contract.

Required Behavior

• folder name must equal manifest name
• keep required policy/category fields

Encouraging Variation

• adapt only to requested scope (repo-local, home-local, or migration)
• include optional surfaces only when requested
• vary scaffold examples for marketplace, private/internal, and skill-adoption requests while keeping manifest fields deterministic

Examples

• "Create a repo-local plugin called linear-helpers with the required .codex-plugin/plugin.json, but do not add marketplace metadata yet."
• "Create review-tools as a plugin and add it to the local marketplace with explicit installation and authentication policy fields."
• "Move my existing agent-ops/branch-cleanup skill into a new plugin without leaving a duplicate canonical copy."
• "Can you migrate this GitHub workflow helper into a plugin scaffold and validate the manifest before marketplace wiring?"

Validation

python3 Skills/skill-builder/Infrastructure/scripts/quick_validate.py Plugins/plugin-factory/skills/scaffolding_templates/plugin-creator
bash Infrastructure/scripts/validation-and-linting/validate_skill_authoring_family.sh

Fail fast: stop at first failed gate and report blocker text.

Anti-Patterns to Avoid

• missing .codex-plugin/plugin.json
• adding hook config when no lifecycle behavior was requested
• partial marketplace policy fields
• copying existing skills instead of moving canonical ownership

Constraints

• redact secrets and tokens in generated examples
• do not overwrite existing plugin roots unless force semantics are explicit

Failure mode

• Stop on unclear plugin ownership, destination conflicts, manifest policy gaps, or ambiguous adoption semantics.
• Report the exact blocker and the smallest safe next action instead of creating a partial plugin surface.

Gotchas

• A plugin scaffold is not a release claim; it still needs skill hardening and eval evidence before distribution.
• Copying a skill into a plugin without moving canonical ownership creates drift.
• Marketplace metadata is a policy surface. Keep it explicit and deterministic.

References

• references/workflow.md
• references/factory-governance-spine.md
• references/contract.yaml
• references/evals.yaml
• references/task-profile.json
• references/plugin-json-spec.md
• ../../../../../Infrastructure/references/openai-style-plugin-design-contract.md
• assets/

Remember

• The agent is capable of extraordinary plugin work when the scaffold stays deterministic. Keep names boring, policy fields explicit, and optional surfaces limited to what the user actually asked for.