Measure plugin cost and usage changedplugins/measure
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Upstream edited this page at 25 Sep 2026 18:09 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 28 Sep 2026 23:37 UTC.
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128128These OpenTelemetry events and attributes answer each plugin question from your backend:
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130| Question | OpenTelemetry event or attribute |
131| :------------------------------------------------ | :------------------------------------------------------------------------------------------------------------------------------------------------------- |
132| Which plugins get installed, and from where | [`claude_code.plugin_installed`](/docs/en/monitoring-usage#plugin-installed-event), one per install |
133| Which plugins are active in how many sessions | [`claude_code.plugin_loaded`](/docs/en/monitoring-usage#plugin-loaded-event), one per enabled plugin at session start |
134| Which skills activate, and which plugin owns them | [`claude_code.skill_activated`](/docs/en/monitoring-usage#skill-activated-event), with `plugin.name` and `marketplace.name` for plugin skills |
135| What a plugin's hooks report | [`claude_code.hook_plugin_metrics`](/docs/en/monitoring-usage#hook-plugin-metrics-event), emitted only for hooks in official-marketplace plugins |
136| What a plugin costs in API spend | `plugin.name` and `marketplace.name` on the [cost counter](/docs/en/monitoring-usage#cost-counter), set when the active skill or subagent belongs to a plugin |
130| Question | OpenTelemetry event or attribute |
131| :- | :- |
132| Which plugins get installed, and from where | [`claude_code.plugin_installed`](/docs/en/monitoring-usage#plugin-installed-event), one per install |
133| Which plugins are active in how many sessions | [`claude_code.plugin_loaded`](/docs/en/monitoring-usage#plugin-loaded-event), one per enabled plugin at session start |
134| Which skills activate, and which plugin owns them | [`claude_code.skill_activated`](/docs/en/monitoring-usage#skill-activated-event), with `plugin.name` and `marketplace.name` for plugin skills |
135| What a plugin's hooks report | [`claude_code.hook_plugin_metrics`](/docs/en/monitoring-usage#hook-plugin-metrics-event), emitted only for hooks in official-marketplace plugins |
136| What a plugin costs in API spend | `plugin.name` and `marketplace.name` on the [cost counter](/docs/en/monitoring-usage#cost-counter), set when the active skill or subagent belongs to a plugin |
137137
138138### Redacted plugin names in your backend
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142142To get real names on some events, set the [`OTEL_LOG_TOOL_DETAILS`](/docs/en/monitoring-usage#common-configuration-variables) environment variable to `1` on the machines that export telemetry, for example in the `env` block of the same [managed settings](/docs/en/monitoring-usage#administrator-configuration) that configure the exporter:
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144| Event | Default | With `OTEL_LOG_TOOL_DETAILS=1` |
145| :------------------------------------ | :------------------------------------------------------------------------------------------------- | :-------------------------------------------------- |
146| `plugin_loaded` | `plugin.name` and `marketplace.name` are the literal string `third-party` | Real names |
147| `plugin_installed`, `skill_activated` | `plugin.name` and `marketplace.name` omitted; on `skill_activated`, `skill.name` is `custom_skill` | Real names |
148| Cost counter | `plugin.name` is `third-party`; `marketplace.name` absent | Real `plugin.name`; `marketplace.name` still absent |
144| Event | Default | With `OTEL_LOG_TOOL_DETAILS=1` |
145| :- | :- | :- |
146| `plugin_loaded` | `plugin.name` and `marketplace.name` are the literal string `third-party` | Real names |
147| `plugin_installed`, `skill_activated` | `plugin.name` and `marketplace.name` omitted; on `skill_activated`, `skill.name` is `custom_skill` | Real names |
148| Cost counter | `plugin.name` is `third-party`; `marketplace.name` absent | Real `plugin.name`; `marketplace.name` still absent |
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150150On `plugin_loaded`, `plugin_id_hash` still identifies each plugin by default, so you can count distinct third-party plugins.
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