Claude Code Session Jsonl Whitespace Text Block

Q: What is a Claude Code skill and how does the Claude Code Session Jsonl Whitespace Text Block skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Claude Code Session Jsonl Whitespace Text Block is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Content category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Content · Sub-category: content-misc · Last updated: 2026-07-25

ai:claude

Repair a Claude Code session whose transcript JSONL has assistant messages containing a whitespace-only text block (typically `{"type":"text","text":" "}`), causing every API call (including new prompts, `/compact`, and `claude --resume`) to fail with HTTP 400 "messages: text content blocks must contain non-whitespace text". Use when: (1) a session refuses to accept new input with that exact 400, (2) `/compact` fails with the same 400 (since compact replays the full history first — it does NOT bypass the validator), (3) `claude --resume <id>` immediately exits with the same error. Covers diagnosis via JSON-walking the message.content array (NOT plain grep — the empty block is often nested), the distinction between message.content (sent to API → must fix) and toolUseResult (local metadata → harmless, leave alone), the underlying cause (extended-thinking turn serialization emits a synthetic single-space placeholder before the thinking block), and an idempotent fixer script that replaces " " with "." while preserving message shape.

Security AStatic scan found no risk patternsHow grading works ›

What this skill does

Claude Code Session Jsonl Whitespace Text Block is a community-contributed Claude Code skill in the content-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/claude-code-session-jsonl-whitespace-text-block/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when: (1) a session refuses to accept new input with that exact 400, (2) `/compact` fails with the same 400 (since compact replays the full history first — it does NOT bypass the validator), (3) `claude --resume <id>` immediately exits with the same error. Covers diagnosis via JSON-walking the message.

Who uses this skill

The Claude Code Session Jsonl Whitespace Text Block Claude Code skill is built for content creators, marketers, copywriters, SEO professionals, and editorial teams. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 196,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/claude-code-session-jsonl-whitespace-text-block
curl -L https://claudskills.com/skills/claude-code-session-jsonl-whitespace-text-block/SKILL.md \
  -o ~/.claude/skills/claude-code-session-jsonl-whitespace-text-block/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/claude-code-session-jsonl-whitespace-text-block/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/claude-code-session-jsonl-whitespace-text-block/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\claude-code-session-jsonl-whitespace-text-block\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Claude Code Session Jsonl Whitespace Text Block Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/claude-code-session-jsonl-whitespace-text-block/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Claude Code Session Jsonl Whitespace Text Block skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Claude Code Session Jsonl Whitespace Text Block skill?

Use Claude Code Session Jsonl Whitespace Text Block when your Claude Code task falls under the Content category — specifically in the content misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Claude Code Session Jsonl Whitespace Text Block" or describe the task and let Claude pick). Browse related skills at /category/content/.

What is a Claude Code skill and how does the Claude Code Session Jsonl Whitespace Text Block skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Claude Code Session Jsonl Whitespace Text Block is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Content category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/wan-huiyan/claude-code-session-repair/blob/HEAD/plugins/claude-code-session-repair/skills/claude-code-session-jsonl-whitespace-text-block/SKILL.md
License: MIT
Author: Claude Code

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

Claude Code. (2026). Claude Code Session Jsonl Whitespace Text Block [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/claude-code-session-jsonl-whitespace-text-block/

BibTeX

@misc{claude-code-session-jsonl-whitespace-text-block-2026,
  author    = {Claude Code},
  title     = {Claude Code Session Jsonl Whitespace Text Block [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/claude-code-session-jsonl-whitespace-text-block/}
}

Embed this skill

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Badge

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Security scan

Grade A · scanned 2026-09-28 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/claude-code-session-jsonl-whitespace-text-block/#security)