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openclaw - 💡(How to fix) Fix Config validation rejects `bootstrapMaxCharsPerFile` as unrecognized key (2026.4.5) [1 participants]

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openclaw/openclaw#62182•Fetched 2026-04-08 03:07:57
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mjamivmjamiv
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mjamivmjamiv

Setting bootstrapMaxCharsPerFile in openclaw.json causes config validation to fail:

Config invalid
File: ~/.openclaw/openclaw.json
Problem:
  - <root>: Unrecognized key "bootstrapMaxCharsPerFile"

This key was previously accepted (or at least silently ignored) in earlier versions. The 20,000 character default appears to be built-in and not configurable, but the key is still referenced in some documentation and community examples.

Error Message

  1. Gateway fails with config validation error

Root Cause

Setting bootstrapMaxCharsPerFile in openclaw.json causes config validation to fail:

Config invalid
File: ~/.openclaw/openclaw.json
Problem:
  - <root>: Unrecognized key "bootstrapMaxCharsPerFile"

This key was previously accepted (or at least silently ignored) in earlier versions. The 20,000 character default appears to be built-in and not configurable, but the key is still referenced in some documentation and community examples.

Fix Action

Workaround

Remove the key from openclaw.json. The default value (20,000 chars) is used automatically.

Code Example

Config invalid
File: ~/.openclaw/openclaw.json
Problem:
  - <root>: Unrecognized key "bootstrapMaxCharsPerFile"
RAW_BUFFERClick to expand / collapse

Bug Report

Version

  • OpenClaw: 2026.4.5

Description

Setting bootstrapMaxCharsPerFile in openclaw.json causes config validation to fail:

Config invalid
File: ~/.openclaw/openclaw.json
Problem:
  - <root>: Unrecognized key "bootstrapMaxCharsPerFile"

This key was previously accepted (or at least silently ignored) in earlier versions. The 20,000 character default appears to be built-in and not configurable, but the key is still referenced in some documentation and community examples.

Steps to Reproduce

  1. Add "bootstrapMaxCharsPerFile": 20000 to openclaw.json
  2. Start the gateway
  3. Gateway fails with config validation error

Expected Behavior

Either:

  • Accept the key as a valid configuration option
  • Or document that it was removed / is not a valid config key

Workaround

Remove the key from openclaw.json. The default value (20,000 chars) is used automatically.

extent analysis

TL;DR

Remove the "bootstrapMaxCharsPerFile" key from the openclaw.json configuration file to resolve the config validation error.

Guidance

  • The error message indicates that the "bootstrapMaxCharsPerFile" key is no longer a recognized configuration option in OpenClaw version 2026.4.5.
  • To verify the fix, remove the key and restart the gateway to ensure it starts without config validation errors.
  • Check the OpenClaw documentation for updated configuration options and community examples to avoid similar issues in the future.
  • If the default value of 20,000 characters is not sufficient, consider reaching out to the OpenClaw community or developers to request the addition of this configuration option.

Notes

The provided workaround is specific to OpenClaw version 2026.4.5 and may not apply to earlier or later versions.

Recommendation

Apply the workaround by removing the "bootstrapMaxCharsPerFile" key from the openclaw.json file, as this is the simplest and most straightforward solution to resolve the config validation error.

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