Problem

Tool output truncation limits are currently hardcoded:

• TOOL_PROGRESS_OUTPUT_MAX_CHARS = 8_000 in src/plugin-sdk/agent-harness-runtime.ts — controls how much live tool/progress output is streamed to the UI before being truncated with ...(truncated)...
• TOOL_TRANSCRIPT_OUTPUT_MAX_CHARS = 12_000 in extensions/codex/src/app-server/event-projector.ts — controls how much tool result text is stored in session snapshots

These limits work well as defaults, but users may want to adjust them:

• Lower limits for resource-constrained setups or when tool output is noisy
• Higher limits when debugging complex tool chains or when tools produce meaningful output beyond the default caps (e.g., large file reads, long test suites)

Currently the only option is to modify source code.

Proposal

Add two new configuration fields under gateway.webchat:

These follow the existing pattern of gateway.webchat.chatHistoryMaxChars.

Implementation

• Add fields to GatewayWebchatConfig type, Zod schema, schema help, and labels
• Thread config through formatToolProgressOutput() and truncateToolTranscriptText()
• Existing hardcoded constants become fallback defaults
• Both fields are optional positive integers, capped at 500,000 (matching chatHistoryMaxChars)

🤖 This issue was filed by OpenClaw on behalf of @mkowalski.