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Load when authoring, writing, or designing a Kotlin Toolchain local plugin to extend the declarative build with code generation, build-time processing, custom verification, or packaging that module.yaml cannot express, or when referencing @TaskAction, @Configurable, plugin.yaml,
Load when authoring, writing, or designing a Kotlin Toolchain local plugin to extend the declarative build with code generation, build-time processing, custom verification, or packaging that module.yaml cannot express, or when referencing @TaskAction, @Configurable, plugin.yaml, or jvm/amper-plugin. Skip for porting an existing Gradle plugin.
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Local plugins are the official escape hatch from declarative YAML: a jvm/amper-plugin module shipping
task actions, settings, and generated sources/resources alongside your project. Code patterns to adapt are
in references/examples.md.
Write one when you need:
project.version../kotlin do release).Don't write one when module.yaml already covers it (dependencies, JDK provisioning, source layouts,
basic packaging), and never to reuse a Gradle plugin โ the Kotlin Toolchain cannot consume them.
repo-root/
โโโ kotlin, kotlin.bat # wrappers (from `kotlin init`)
โโโ project.yaml # registers the plugin
โโโ plugins/<name>/
โ โโโ module.yaml # product: jvm/amper-plugin
โ โโโ plugin.yaml # tasks: + commands: + generated:
โ โโโ src/
โ โโโ Settings.kt # @Configurable interface
โ โโโ tasks/ # one @TaskAction per file
โ โ โโโ Foo.kt
โ โ โโโ FooSteps.kt # internal shared helpers (not @TaskAction)
โ โโโ <domain logic>/
โโโ <consumer-module>/
โโโ module.yaml # plugins: { <name>: enabled: true, ... }
Keep at least one consumer module in the repo โ it is the only way to exercise the plugin end-to-end, and plugins cannot be published to any public registry yet.
project.yamlmodules:
- consumer-app
- plugins/<name>
plugins:
- ./plugins/<name>
Without the top-level plugins: block the plugin id is unresolvable from any consumer.
module.yaml โ the plugin moduleproduct: jvm/amper-plugin # marks the module as a plugin
dependencies:
- <coordinate>:<version>
- <coordinate>:<version>: runtime-only # required only at runtime
- <coordinate>:<version>: compile-only
pluginInfo:
id: <plugin-id> # what consumers write under `plugins:`
settingsClass: <fully.qualified.Settings> # the @Configurable interface
settings:
jvm:
jdk:
version: 21
kotlin:
languageVersion: 2.1
@Configurable interface SettingsDefaults go in interface property getters; nested blocks become nested @Configurable interfaces.
@Configurable
interface Settings {
val someValue: String get() = "default"
val checks: ChecksSettings
}
@Configurable
interface ChecksSettings {
val strict: Boolean get() = true
}
Consumers override what they need in module.yaml; omitted values fall back to the getter default:
plugins:
<plugin-id>:
enabled: true
someValue: "override"
checks:
strict: false
@TaskActionTask actions are top-level funs, called when the matching plugin.yaml entry executes.
@TaskAction
fun foo(
@Input moduleRootDir: Path,
@Output outputDir: Path,
settings: Settings,
) {
// body
}
@Input path: Path โ declared input; Kotlin Toolchain snapshots its contents for execution avoidance.@Output path: Path โ declared output directory; Kotlin Toolchain creates it and passes the path in. Write
to the exact Path you received, or downstream references won't find the result.settings: Settings (or any @Configurable) โ typed configuration, wired in plugin.yaml.Path / primitives โ passed literally from plugin.yaml.println(...) is the output channel; Kotlin Toolchain captures stdout.A @TaskAction is skipped when its declared inputs are unchanged. Tasks whose real inputs are Git history,
the network, or environment variables cannot be fingerprinted, so opt out:
@TaskAction(executionAvoidance = ExecutionAvoidance.Disabled)
fun foo(@Output outputDir: Path, settings: Settings) { /* ... */ }
Tasks with no @Output are never cached and always re-run โ correct for purely side-effecting tasks
(releases, deployments, pushes).
plugin.yamltasks:
foo:
action: !<fully.qualified.foo>
moduleRootDir: ${module.rootDir}
outputDir: ${taskOutputDir}
settings: ${pluginSettings}
bar:
action: !<fully.qualified.bar>
input: ${tasks.foo.action.outputDir}/result.txt
settings: ${pluginSettings}
generated:
resources:
- directory: ${tasks.foo.action.outputDir}
commands:
- foo
| Reference | Resolves to |
|---|---|
${module.rootDir} | Directory containing the consumer's module.yaml. Pass as @Input to inspect the consumer's tree. |
${taskOutputDir} | Toolchain-managed per-task output directory. Pass as @Output. |
${pluginSettings} | The @Configurable object built from the consumer's module.yaml. |
${tasks.<task>.action.<param>} | Another task's parameter โ used in generated.* and to wire one task's @Input to another's @Output. |
generated.resources / generated.sourcesBoth register a directory (usually a task's @Output) as a contribution to the consumer's build, and both
auto-wire the producing task to run first:
generated.resources โ added to the JAR classpath, reachable via getResourceAsStream("/path/in/jar").generated.sources โ added as a Kotlin source root and compiled with the consumer's src/.Tasks are the implementation, addressed as ./kotlin task :<module>:<task>@<plugin-id> โ the docs advise
against relying on that mangled name. Commands are the public API: ./kotlin do <command-name>, listed via
./kotlin show commands (-m <module> to scope).
@Output feeds generated.resources/generated.sources is a build-graph contributor. Keep
it out of commands:; it runs automatically and exposing it invites users to run it by hand.commands:.There is no shared mutable build state โ no project.version, no extension property maps. Tasks talk
through matched paths:
@Output outputDir: Path and writes files into it.plugin.yaml points a consumer task's @Input at ${tasks.<producer>.action.outputDir}/<file>.dependsOn API needed.The same @Output directory can serve build-time consumers (via @Input) and runtime consumers
(registered under generated.resources, read via getResourceAsStream) simultaneously.
There is no -Pkey=value. Read env vars inside the action for ephemeral overrides:
val forced = System.getenv("MYPLUGIN_FORCE_VALUE")?.takeIf { it.isNotBlank() }
val skipChecks = System.getenv("MYPLUGIN_SKIP_CHECKS")?.equals("true", ignoreCase = true) == true
Pass the env map in as a constructor parameter rather than calling System.getenv() deep in the call stack,
so logic stays unit-testable. Document every recognised variable in the plugin's README. Env vars are
ephemeral overrides, not a trust boundary โ validate a value before using it in a file path or process
argument.
Tasks often share steps (verify โ create โ push). Don't compose an atomic user-facing task from a chain of build-graph tasks: separate invocations re-open shared resources and open a window where another process observes intermediate state.
plugins:, and cross-module effects flow through files.${...} interpolation in module.yaml (as of 0.11) โ consumer settings are literal values.Project.afterEvaluate, no lazy Provider/Property graph. Compute derived values in the action body.-h/--help does not list plugin commands; use ./kotlin show commands.demo-app/, sample/) enabling the plugin with realistic settings.main.kt or a test read whatever the plugin publishes.Plugin docs: https://kotlin-toolchain.org/dev/user-guide/plugins/
name: kotlin-tooling-kotlin-toolchain-plugin-authoring description: > Load when authoring, writing, or designing a Kotlin Toolchain local plugin to extend the declarative build with code generation, build-time processing, custom verification, or packaging that module.yaml cannot express, or when referencing @TaskAction, @Configurable, plugin.yaml, or jvm/amper-plugin. Skip for porting an existing Gradle plugin. license: Apache-2.0 metadata: author: github:@singleton11 version: "0.1.0"
---
name: kotlin-tooling-kotlin-toolchain-plugin-authoring
description: >
Load when authoring, writing, or designing a Kotlin Toolchain local plugin to
extend the declarative build with code generation, build-time processing,
custom verification, or packaging that module.yaml cannot express, or when
referencing @TaskAction, @Configurable, plugin.yaml, or jvm/amper-plugin. Skip
for porting an existing Gradle plugin.
license: Apache-2.0
metadata:
author: github:@singleton11
version: "0.1.0"
---
# Kotlin Toolchain Plugin Authoring
Local plugins are the official escape hatch from declarative YAML: a `jvm/amper-plugin` module shipping
task actions, settings, and generated sources/resources alongside your project. Code patterns to adapt are
in [references/examples.md](references/examples.md).
## When to write a plugin
Write one when you need:
- A build-time step a library's workflow expects (code generation, schema compilation, resource
transformation, version stamping).
- Custom verification wired into the build (pre-release checks, schema validation, contract tests).
- A build-time value published into the JAR classpath or downstream tasks โ the closest analog to Gradle's
`project.version`.
- A named CLI command for a repeated workflow (`./kotlin do release`).
Don't write one when `module.yaml` already covers it (dependencies, JDK provisioning, source layouts,
basic packaging), and never to reuse a Gradle plugin โ the Kotlin Toolchain cannot consume them.
## Layout
```
repo-root/
โโโ kotlin, kotlin.bat # wrappers (from `kotlin init`)
โโโ project.yaml # registers the plugin
โโโ plugins/<name>/
โ โโโ module.yaml # product: jvm/amper-plugin
โ โโโ plugin.yaml # tasks: + commands: + generated:
โ โโโ src/
โ โโโ Settings.kt # @Configurable interface
โ โโโ tasks/ # one @TaskAction per file
โ โ โโโ Foo.kt
โ โ โโโ FooSteps.kt # internal shared helpers (not @TaskAction)
โ โโโ <domain logic>/
โโโ <consumer-module>/
โโโ module.yaml # plugins: { <name>: enabled: true, ... }
```
Keep at least one consumer module in the repo โ it is the only way to exercise the plugin end-to-end, and
plugins cannot be published to any public registry yet.
## `project.yaml`
```yaml
modules:
- consumer-app
- plugins/<name>
plugins:
- ./plugins/<name>
```
Without the top-level `plugins:` block the plugin id is unresolvable from any consumer.
## `module.yaml` โ the plugin module
```yaml
product: jvm/amper-plugin # marks the module as a plugin
dependencies:
- <coordinate>:<version>
- <coordinate>:<version>: runtime-only # required only at runtime
- <coordinate>:<version>: compile-only
pluginInfo:
id: <plugin-id> # what consumers write under `plugins:`
settingsClass: <fully.qualified.Settings> # the @Configurable interface
settings:
jvm:
jdk:
version: 21
kotlin:
languageVersion: 2.1
```
## `@Configurable interface Settings`
Defaults go in interface property getters; nested blocks become nested `@Configurable` interfaces.
```kotlin
@Configurable
interface Settings {
val someValue: String get() = "default"
val checks: ChecksSettings
}
@Configurable
interface ChecksSettings {
val strict: Boolean get() = true
}
```
Consumers override what they need in `module.yaml`; omitted values fall back to the getter default:
```yaml
plugins:
<plugin-id>:
enabled: true
someValue: "override"
checks:
strict: false
```
## `@TaskAction`
Task actions are top-level `fun`s, called when the matching `plugin.yaml` entry executes.
```kotlin
@TaskAction
fun foo(
@Input moduleRootDir: Path,
@Output outputDir: Path,
settings: Settings,
) {
// body
}
```
- `@Input path: Path` โ declared input; Kotlin Toolchain snapshots its contents for execution avoidance.
- `@Output path: Path` โ declared output directory; Kotlin Toolchain creates it and passes the path in. Write
to the exact `Path` you received, or downstream references won't find the result.
- `settings: Settings` (or any `@Configurable`) โ typed configuration, wired in `plugin.yaml`.
- Plain `Path` / primitives โ passed literally from `plugin.yaml`.
- `println(...)` is the output channel; Kotlin Toolchain captures stdout.
### Execution avoidance
A `@TaskAction` is skipped when its declared inputs are unchanged. Tasks whose real inputs are Git history,
the network, or environment variables cannot be fingerprinted, so opt out:
```kotlin
@TaskAction(executionAvoidance = ExecutionAvoidance.Disabled)
fun foo(@Output outputDir: Path, settings: Settings) { /* ... */ }
```
Tasks with no `@Output` are never cached and always re-run โ correct for purely side-effecting tasks
(releases, deployments, pushes).
## `plugin.yaml`
```yaml
tasks:
foo:
action: !<fully.qualified.foo>
moduleRootDir: ${module.rootDir}
outputDir: ${taskOutputDir}
settings: ${pluginSettings}
bar:
action: !<fully.qualified.bar>
input: ${tasks.foo.action.outputDir}/result.txt
settings: ${pluginSettings}
generated:
resources:
- directory: ${tasks.foo.action.outputDir}
commands:
- foo
```
| Reference | Resolves to |
|---|---|
| `${module.rootDir}` | Directory containing the consumer's `module.yaml`. Pass as `@Input` to inspect the consumer's tree. |
| `${taskOutputDir}` | Toolchain-managed per-task output directory. Pass as `@Output`. |
| `${pluginSettings}` | The `@Configurable` object built from the consumer's `module.yaml`. |
| `${tasks.<task>.action.<param>}` | Another task's parameter โ used in `generated.*` and to wire one task's `@Input` to another's `@Output`. |
### `generated.resources` / `generated.sources`
Both register a directory (usually a task's `@Output`) as a contribution to the consumer's build, and both
auto-wire the producing task to run first:
- `generated.resources` โ added to the JAR classpath, reachable via `getResourceAsStream("/path/in/jar")`.
- `generated.sources` โ added as a Kotlin source root and compiled with the consumer's `src/`.
### Tasks vs commands
Tasks are the implementation, addressed as `./kotlin task :<module>:<task>@<plugin-id>` โ the docs advise
against relying on that mangled name. Commands are the public API: `./kotlin do <command-name>`, listed via
`./kotlin show commands` (`-m <module>` to scope).
- A task whose `@Output` feeds `generated.resources`/`generated.sources` is a build-graph contributor. Keep
it out of `commands:`; it runs automatically and exposing it invites users to run it by hand.
- A task users invoke directly must be in `commands:`.
## File-based task communication
There is no shared mutable build state โ no `project.version`, no extension property maps. Tasks talk
through matched paths:
1. The producer takes `@Output outputDir: Path` and writes files into it.
2. `plugin.yaml` points a consumer task's `@Input` at `${tasks.<producer>.action.outputDir}/<file>`.
3. The Toolchain infers the dependency from the path match โ no `dependsOn` API needed.
The same `@Output` directory can serve build-time consumers (via `@Input`) and runtime consumers
(registered under `generated.resources`, read via `getResourceAsStream`) simultaneously.
## Runtime overrides via environment variables
There is no `-Pkey=value`. Read env vars inside the action for ephemeral overrides:
```kotlin
val forced = System.getenv("MYPLUGIN_FORCE_VALUE")?.takeIf { it.isNotBlank() }
val skipChecks = System.getenv("MYPLUGIN_SKIP_CHECKS")?.equals("true", ignoreCase = true) == true
```
Pass the env map in as a constructor parameter rather than calling `System.getenv()` deep in the call stack,
so logic stays unit-testable. Document every recognised variable in the plugin's README. Env vars are
ephemeral overrides, not a trust boundary โ validate a value before using it in a file path or process
argument.
## Sharing logic across task actions
Tasks often share steps (verify โ create โ push). Don't compose an atomic user-facing task from a chain of
build-graph tasks: separate invocations re-open shared resources and open a window where another process
observes intermediate state.
## Limitations to design around
- Plugins are local-only; no public registry publishing yet.
- Plugins are module-level; there is no project-wide plugin. Every consumer module lists it under
`plugins:`, and cross-module effects flow through files.
- No `${...}` interpolation in `module.yaml` (as of 0.11) โ consumer settings are literal values.
- No `Project.afterEvaluate`, no lazy `Provider`/`Property` graph. Compute derived values in the action body.
- `-h`/`--help` does not list plugin commands; use `./kotlin show commands`.
## Validate against a consumer
1. Add a small consumer module (`demo-app/`, `sample/`) enabling the plugin with realistic settings.
2. Have its `main.kt` or a test read whatever the plugin publishes.
3. Put the exact commands and expected output in the plugin's README, so a fresh clone can paste and compare.
Plugin docs: <https://kotlin-toolchain.org/dev/user-guide/plugins/>
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: Apache-2.0
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
72/100
Strong
Trust
67
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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"successfulOutcomes": 0,
"failedOutcomes": 0,
"installAttempts": 0,
"installSuccessRate": null,
"successRate": null,
"recentSuccessRate": null,
"recentFailureRate": null,
"riskBlocked": 0,
"setupRequired": 0,
"notRelevant": 0,
"avgOutputQuality": null,
"avgTimeToUsefulMs": null,
"productionOutcomes": 0,
"humanReviewRequired": 0,
"uniqueAgents": 0,
"lastOutcomeAt": null
},
"signals": [],
"penalties": [
"No real agent outcome evidence yet"
]
},
"audit": {
"score": 79,
"risk_level": "needs_review",
"risk_label": "Needs review",
"warnings": [
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"AI review approval is missing",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution",
"Dependency/runtime risk: command execution surface, credential or environment access",
"Permission surface: secrets or environment access, shell or command execution",
"Review status: AI review approval is missing"
]
},
"safety_gate": {
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"label": "Blocked for auto-install",
"auto_install_policy": "block",
"auto_install_allowed": false,
"human_review_required": true,
"blocked": true,
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"quality": {
"score": 72,
"label": "Strong"
},
"supply": {
"track": "Design and creative production",
"scenario": "Design and creative",
"maintenance": "5d since push",
"risk": "Needs review"
},
"alternative_skills": [],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"high-compliance environments without internal security review",
"No OpenAgentSkill engagement data yet",
"High-risk permission hints: Shell or command execution, Secrets or environment access",
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"AI review approval is missing",
"Quality score needs review"
],
"agent_contract": {
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"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 75/100 Strong shortlist",
"Audit: 79/100 Needs review",
"Safety: 35/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "kotlin-kotlin-tooling-kotlin-toolchain-plugin-authoring (kotlin-tooling-kotlin-toolchain-plugin-authoring)",
"install_command": "npx skills add Kotlin/kotlin-agent-skills --skill kotlin-tooling-kotlin-toolchain-plugin-authoring",
"risk_summary": "Needs review; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "kotlin-kotlin-tooling-kotlin-toolchain-plugin-authoring",
"task": "Use kotlin-tooling-kotlin-toolchain-plugin-authoring in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/kotlin-kotlin-tooling-kotlin-toolchain-plugin-authoring",
"api": "https://www.openagentskill.com/api/agent/skills/kotlin-kotlin-tooling-kotlin-toolchain-plugin-authoring",
"audit": "https://www.openagentskill.com/skills/kotlin-kotlin-tooling-kotlin-toolchain-plugin-authoring/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=kotlin-kotlin-tooling-kotlin-toolchain-plugin-authoring&task=Use%20kotlin-tooling-kotlin-toolchain-plugin-authoring%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20kotlin-tooling-kotlin-toolchain-plugin-authoring%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20kotlin-tooling-kotlin-toolchain-plugin-authoring%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/kotlin-kotlin-tooling-kotlin-toolchain-plugin-authoring/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/kotlin-kotlin-tooling-kotlin-toolchain-plugin-authoring"
}
}Listing source
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Sandbox only
Audit
79/100
Needs review
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.