How do I install the Fine Grained Tool Streaming skill?

Run npx skillmds@latest add tankygranny05/fine-grained-tool-streaming in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Fine Grained Tool Streaming safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: executes scripts, reads secrets. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Fine Grained Tool Streaming?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Fine Grained Tool Streaming free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Fine Grained Tool Streaming?

tankygranny05 (@tankygranny05) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Fine Grained Tool Streaming by tankygranny05

Name: Fine Grained Tool Streaming
Rating: 4.666666666666667 (3 reviews)
Author: tankygranny05

Fine Grained Tool Streaming

Patch Claude Code cli.js to enable fine-grained tool streaming (input_json_delta). Use when tool call arguments arrive as a single burst at the end instead of streaming incrementally, when sse_lines.jsonl shows few/no input_json_delta events, or when asked to "enable tool streaming", "fix partial json", or "patch fine-grained streaming".

tankygranny05 Updated Sep 10, 2026

File contents

Fine-Grained Tool Streaming Patch

Enables incremental streaming of tool call arguments (input_json_delta) in Claude Code cli.js.

Problem

Pristine Claude Code cli.js does NOT enable the fine-grained-tool-streaming-2025-05-14 beta by default. Tool arguments arrive as a single burst at the end instead of streaming character-by-character.

Solution

Add Q.push("fine-grained-tool-streaming-2025-05-14") to the betas builder function.

Patch Procedure

1. Find the patch point

grep -n "process.env.ANTHROPIC_BETAS" cli.js

Look for the betas builder function (typically in module RR, function pp1).

2. Identify the insertion point

Find these consecutive lines:

if (G === "vertex" && ...) Q.push(...);
if (G === "foundry") Q.push(...);
if (process.env.ANTHROPIC_BETAS && !B)

3. Insert the patch

Add these 2 lines BEFORE if (process.env.ANTHROPIC_BETAS:

if (G === "firstParty" && !a1(process.env.CLAUDE_CODE_DISABLE_FINE_GRAINED_TOOL_STREAMING))
  Q.push("fine-grained-tool-streaming-2025-05-14");

Note: a1 is the env-var truthy checker (varies by version: a1, B0, etc.). Find it by searching !a1(process.env.DISABLE_ nearby.

4. Run the patch script

python scripts/patch_fine_grained_streaming.py <path-to-cli.js>

Verification

node cli.js --dangerously-skip-permissions --log-dir /tmp/test-fgts \
  -p "Write a 50 word story. Save to /tmp/test-fgts/story.txt"

# Check for multiple input_json_delta events
grep -c "input_json_delta" /tmp/test-fgts/sse_lines.jsonl
# Should be >10 (not 0-2)

# Check timestamps are spread out (not burst)
grep "input_json_delta" /tmp/test-fgts/sse_lines.jsonl | head -5 | jq -r '.t'

Disable (if needed)

Set env var to disable:

CLAUDE_CODE_DISABLE_FINE_GRAINED_TOOL_STREAMING=1 node cli.js ...

---name: fine-grained-tool-streamingdescription: Patch Claude Code cli.js to enable fine-grained tool streaming (input_json_delta). Use when tool call arguments arrive as a single burst at the end instead of streaming incrementally, when sse_lines.jsonl shows few/no input_json_delta events, or when asked to "enable tool streaming", "fix partial json", or "patch fine-grained streaming".---# Fine-Grained Tool Streaming PatchEnables incremental streaming of tool call arguments (`input_json_delta`) in Claude Code cli.js.## ProblemPristine Claude Code cli.js does NOT enable the `fine-grained-tool-streaming-2025-05-14` beta by default. Tool arguments arrive as a single burst at the end instead of streaming character-by-character.## SolutionAdd `Q.push("fine-grained-tool-streaming-2025-05-14")` to the betas builder function.## Patch Procedure### 1. Find the patch point```bashgrep -n "process.env.ANTHROPIC_BETAS" cli.js```Look for the betas builder function (typically in module `RR`, function `pp1`).### 2. Identify the insertion pointFind these consecutive lines:```javascriptif (G === "vertex" && ...) Q.push(...);if (G === "foundry") Q.push(...);if (process.env.ANTHROPIC_BETAS && !B)```### 3. Insert the patchAdd these 2 lines BEFORE `if (process.env.ANTHROPIC_BETAS`:```javascriptif (G === "firstParty" && !a1(process.env.CLAUDE_CODE_DISABLE_FINE_GRAINED_TOOL_STREAMING)) Q.push("fine-grained-tool-streaming-2025-05-14");```**Note:** `a1` is the env-var truthy checker (varies by version: `a1`, `B0`, etc.). Find it by searching `!a1(process.env.DISABLE_` nearby.### 4. Run the patch script```bashpython scripts/patch_fine_grained_streaming.py <path-to-cli.js>```## Verification```bashnode cli.js --dangerously-skip-permissions --log-dir /tmp/test-fgts \ -p "Write a 50 word story. Save to /tmp/test-fgts/story.txt"# Check for multiple input_json_delta eventsgrep -c "input_json_delta" /tmp/test-fgts/sse_lines.jsonl# Should be >10 (not 0-2)# Check timestamps are spread out (not burst)grep "input_json_delta" /tmp/test-fgts/sse_lines.jsonl | head -5 | jq -r '.t'```## Disable (if needed)Set env var to disable:```bashCLAUDE_CODE_DISABLE_FINE_GRAINED_TOOL_STREAMING=1 node cli.js ...```

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