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refactor: extract extractParameterKey to display-utils module
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‎README.md‎

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Original file line numberDiff line numberDiff line change
@@ -6,14 +6,6 @@ Automatically reduces token usage in OpenCode by removing obsolete tool outputs
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![DCP in action](dcp-demo.png)
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## Pruning Strategies
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DCP implements two complementary strategies:
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**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.
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**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.
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## Installation
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Add to your OpenCode config:
@@ -29,8 +21,13 @@ When a new version is available, DCP will show a toast notification. Update by c
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Restart OpenCode. The plugin will automatically start optimizing your sessions.
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> **Note:** Project `plugin` arrays override global completely—include all desired plugins in project config if using both.
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## Pruning Strategies
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DCP implements two complementary strategies:
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**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.
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**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.
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## How It Works
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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.

‎lib/deduplicator.ts‎

Lines changed: 2 additions & 73 deletions
Original file line numberDiff line numberDiff line change
@@ -1,3 +1,5 @@
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import { extractParameterKey } from "./display-utils"
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export interface DuplicateDetectionResult {
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duplicateIds: string[] // IDs to prune (older duplicates)
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deduplicationDetails: Map<string, {
@@ -85,76 +87,3 @@ function sortObjectKeys(obj: any): any {
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}
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return sorted
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}
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export function extractParameterKey(metadata: { tool: string, parameters?: any }): string {
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if (!metadata.parameters) return ''
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const { tool, parameters } = metadata
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if (tool === "read" && parameters.filePath) {
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return parameters.filePath
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}
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if (tool === "write" && parameters.filePath) {
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return parameters.filePath
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}
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if (tool === "edit" && parameters.filePath) {
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return parameters.filePath
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}
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if (tool === "list") {
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return parameters.path || '(current directory)'
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}
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if (tool === "glob") {
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if (parameters.pattern) {
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const pathInfo = parameters.path ? ` in ${parameters.path}` : ""
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return `"${parameters.pattern}"${pathInfo}`
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}
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return '(unknown pattern)'
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}
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if (tool === "grep") {
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if (parameters.pattern) {
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const pathInfo = parameters.path ? ` in ${parameters.path}` : ""
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return `"${parameters.pattern}"${pathInfo}`
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}
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return '(unknown pattern)'
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}
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if (tool === "bash") {
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if (parameters.description) return parameters.description
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if (parameters.command) {
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return parameters.command.length > 50
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? parameters.command.substring(0, 50) + "..."
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: parameters.command
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}
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}
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if (tool === "webfetch" && parameters.url) {
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return parameters.url
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}
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if (tool === "websearch" && parameters.query) {
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return `"${parameters.query}"`
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}
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if (tool === "codesearch" && parameters.query) {
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return `"${parameters.query}"`
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}
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if (tool === "todowrite") {
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return `${parameters.todos?.length || 0} todos`
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}
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if (tool === "todoread") {
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return "read todo list"
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}
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if (tool === "task" && parameters.description) {
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return parameters.description
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}
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if (tool === "batch") {
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return `${parameters.tool_calls?.length || 0} parallel tools`
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}
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const paramStr = JSON.stringify(parameters)
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if (paramStr === '{}' || paramStr === '[]' || paramStr === 'null') {
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return ''
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}
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return paramStr.substring(0, 50)
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}

‎lib/display-utils.ts‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,76 @@
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/**
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* Extracts a human-readable key from tool metadata for display purposes.
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* Used by both deduplication and AI analysis to show what was pruned.
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*/
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export function extractParameterKey(metadata: { tool: string, parameters?: any }): string {
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if (!metadata.parameters) return ''
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const { tool, parameters } = metadata
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if (tool === "read" && parameters.filePath) {
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return parameters.filePath
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}
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if (tool === "write" && parameters.filePath) {
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return parameters.filePath
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}
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if (tool === "edit" && parameters.filePath) {
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return parameters.filePath
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}
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if (tool === "list") {
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return parameters.path || '(current directory)'
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}
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if (tool === "glob") {
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if (parameters.pattern) {
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const pathInfo = parameters.path ? ` in ${parameters.path}` : ""
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return `"${parameters.pattern}"${pathInfo}`
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}
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return '(unknown pattern)'
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}
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if (tool === "grep") {
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if (parameters.pattern) {
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const pathInfo = parameters.path ? ` in ${parameters.path}` : ""
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return `"${parameters.pattern}"${pathInfo}`
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}
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return '(unknown pattern)'
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}
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if (tool === "bash") {
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if (parameters.description) return parameters.description
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if (parameters.command) {
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return parameters.command.length > 50
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? parameters.command.substring(0, 50) + "..."
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: parameters.command
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}
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}
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if (tool === "webfetch" && parameters.url) {
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return parameters.url
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}
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if (tool === "websearch" && parameters.query) {
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return `"${parameters.query}"`
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}
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if (tool === "codesearch" && parameters.query) {
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return `"${parameters.query}"`
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}
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if (tool === "todowrite") {
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return `${parameters.todos?.length || 0} todos`
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}
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if (tool === "todoread") {
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return "read todo list"
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}
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if (tool === "task" && parameters.description) {
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return parameters.description
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}
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if (tool === "batch") {
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return `${parameters.tool_calls?.length || 0} parallel tools`
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}
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const paramStr = JSON.stringify(parameters)
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if (paramStr === '{}' || paramStr === '[]' || paramStr === 'null') {
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return ''
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}
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return paramStr.substring(0, 50)
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}

‎lib/janitor.ts‎

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Original file line numberDiff line numberDiff line change
@@ -4,7 +4,8 @@ import type { PruningStrategy } from "./config"
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import { buildAnalysisPrompt } from "./prompt"
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import { selectModel, extractModelFromSession } from "./model-selector"
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import { estimateTokensBatch, formatTokenCount } from "./tokenizer"
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import { detectDuplicates, extractParameterKey } from "./deduplicator"
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import { detectDuplicates } from "./deduplicator"
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import { extractParameterKey } from "./display-utils"
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export interface SessionStats {
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totalToolsPruned: number

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