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Dynamic Context Pruning Plugin

npm version

Automatically reduces token usage in OpenCode by removing obsolete tool outputs from conversation history.

DCP in action

Pruning Strategies

DCP implements two complementary strategies:

Deduplication — Fast, zero-cost pruning that identifies repeated tool calls (e.g., reading the same file multiple times) and keeps only the most recent output. Runs instantly with no LLM calls.

AI Analysis — Uses a language model to semantically analyze conversation context and identify tool outputs that are no longer relevant to the current task. More thorough but incurs LLM cost.

Installation

Add to your OpenCode config:

// opencode.jsonc
{
  "plugins": ["@tarquinen/opencode-dcp@0.3.17"]
}

When a new version is available, DCP will show a toast notification. Update by changing the version number in your config.

Restart OpenCode. The plugin will automatically start optimizing your sessions.

Note: Project plugin arrays override global completely—include all desired plugins in project config if using both.

How It Works

DCP is non-destructive—pruning state is kept in memory only. When requests go to your LLM, DCP replaces pruned outputs with a placeholder; original session data stays intact.

Configuration

DCP uses its own config file (~/.config/opencode/dcp.jsonc or .opencode/dcp.jsonc), created automatically on first run.

Options

Option Default Description
enabled true Enable/disable the plugin
debug false Log to ~/.config/opencode/logs/dcp/
model (session) Model for analysis (e.g., "anthropic/claude-haiku-4-5")
showModelErrorToasts true Show notifications on model fallback
strictModelSelection false Only run AI analysis with session or configured model (disables fallback models)
pruning_summary "detailed" "off", "minimal", or "detailed"
protectedTools ["task", "todowrite", "todoread", "context_pruning"] Tools that are never pruned
strategies.onIdle ["deduplication", "ai-analysis"] Strategies for automatic pruning
strategies.onTool ["deduplication"] Strategies when AI calls context_pruning

Strategies: "deduplication" (fast, zero LLM cost) and "ai-analysis" (maximum savings). Empty array disables that trigger.

{
  "enabled": true,
  "strategies": {
    "onIdle": ["deduplication", "ai-analysis"],
    "onTool": ["deduplication"]
  },
  "protectedTools": ["task", "todowrite", "todoread", "context_pruning"]
}

Config Precedence

Settings are merged in order: Defaults → Global (~/.config/opencode/dcp.jsonc) → Project (.opencode/dcp.jsonc). Each level overrides the previous, so project settings take priority over global, which takes priority over defaults.

Restart OpenCode after making config changes.

License

MIT