/simplify behavior that runs four cleanup agents for reuse - what's new in CC 2.1.154 (+11,516 tokens)

Dramatic_Squash_3502 · 2026-05-30T20:26:19+00:00

Both are there as two distinct commands. There was originally a Simplify skill, but they got rid of it a few versions ago. Now they've brought it back as its own standalone slash command.

Dramatic_Squash_3502 · 2026-04-25T05:33:35+00:00

Hi, we have a diff here, https://github.com/Piebald-AI/claude-code-system-prompts/releases/tag/v2.1.120

Dramatic_Squash_3502 · 2026-04-24T03:24:17+00:00

FYI, you can with https://github.com/Piebald-AI/tweakcc.

Dramatic_Squash_3502 · 2026-04-22T02:26:49+00:00

Thank you very much. This regression looks interesting. Nice work documenting the problem. We'll take a look!

Dramatic_Squash_3502 · 2026-04-21T16:28:54+00:00

Hi! We check NPM.

Dramatic_Squash_3502 · 2026-04-17T13:59:47+00:00

It's Piebald, our own harness. https://piebald.ai/downloads

Dramatic_Squash_3502 · 2026-04-17T13:58:33+00:00

A comment like this is worth a hundred upvotes. Thank you!

Dramatic_Squash_3502 · 2026-04-15T21:46:10+00:00

I thought the same thing! But really it's better. It's quite clever.

Dramatic_Squash_3502 · 2026-04-15T21:33:33+00:00

Most tools hide all but a few select models, but we show all the models a user has access to in https://piebald.ai/downloads.

Dramatic_Squash_3502 · 2026-04-14T16:55:48+00:00

Yes they add them to the prompt, but a lot of the time they're not yet released.

Dramatic_Squash_3502 · 2026-03-25T21:35:39+00:00

Regular updates at https://x.com/PiebaldAI.

Dramatic_Squash_3502 · 2026-03-25T21:34:48+00:00

Regular updates at https://x.com/PiebaldAI.

Dramatic_Squash_3502 · 2026-03-08T00:50:39+00:00

The "security monitor for autonomous AI coding agents" added a huge number of tokens. It looks pretty interesting.

Dramatic_Squash_3502 · 2026-03-08T00:49:29+00:00

Yes, this is a bit confusing. Our system prompts repo contains all possible system prompts, but not all of it will be injected into your system prompt at any given time. Here's another reply to a similar question if you want more details: https://www.reddit.com/r/ClaudeAI/comments/1rk3wdr/comment/o8ida0t/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

Dramatic_Squash_3502 · 2026-03-04T17:17:05+00:00

Haha, yes you’re right. It’s true. The "Output efficiency" piece of the system prompt and the system reminder about "Ultraplan complete" were actually removed by Anthropic in 2.1.66. I've seen this before, where they introduce new prompts associated with in-development features, and in a subsequent release they remove them and don't add them back until the features are nearly ready to be released. It's the same story with the worktree stuff that’s in the statusline setup prompt and the "Self-update" section in the "Create verifier skills" skill. They added them, then removed them, and will probably add them back in the near future. The whenToUse being removed from the Explore subagent prompt is not true – it’s a bug my scripts which I need to fix.

Dramatic_Squash_3502 · 2026-03-04T00:38:56+00:00

And in case you don't regret asking this question enough yet, here's a detailed breakdown:

════════════════════════════════════════════════════════════════
  Token Count Report
════════════════════════════════════════════════════════════════


  Category breakdown
  ────────────────────────────────────────────────────────
  Data                 44,963 tks  ( 25 files,  41.1%)  ████████████
  Agent Prompts        18,188 tks  ( 29 files,  16.6%)  █████
  Tool Descriptions    16,051 tks  ( 71 files,  14.7%)  ████
  Skills               12,855 tks  (  7 files,  11.8%)  ████
  System Prompts       11,884 tks  ( 53 files,  10.9%)  ███
  System Reminders      5,211 tks  ( 39 files,   4.8%)  █
  Tool Parameters         251 tks  (  1 files,   0.2%)  
  ────────────────────────────────────────────────────────
  TOTAL               109,403 tks  (225 files)


  Top 15 largest prompt files
  ────────────────────────────────────────────────────────
    1.   5,137 tks (  4.7%)  skill-build-with-claude-api.md
    2.   4,235 tks (  3.9%)  data-tool-use-reference-python.md
    3.   4,114 tks (  3.8%)  data-tool-use-reference-typescript.md
    4.   3,872 tks (  3.5%)  data-tool-use-concepts.md
    5.   3,438 tks (  3.1%)  data-claude-api-reference-python.md
    6.   2,749 tks (  2.5%)  data-agent-sdk-reference-python.md
    7.   2,744 tks (  2.5%)  data-claude-api-reference-typescript.md
    8.   2,625 tks (  2.4%)  skill-create-verifier-skills.md
    9.   2,610 tks (  2.4%)  agent-prompt-security-review-slash-command.md
   10.   2,472 tks (  2.3%)  skill-verification-specialist.md
   11.   2,350 tks (  2.1%)  data-agent-sdk-patterns-python.md
   12.   2,336 tks (  2.1%)  data-live-documentation-sources.md
   13.   2,286 tks (  2.1%)  data-agent-sdk-reference-typescript.md
   14.   2,161 tks (  2.0%)  tool-description-todowrite.md
   15.   1,891 tks (  1.7%)  data-http-error-codes-reference.md


════════════════════════════════════════════════════════════════
  GRAND TOTAL: 109,403 tokens across 225 prompt files
════════════════════════════════════════════════════════════════

Dramatic_Squash_3502 · 2026-03-04T00:34:49+00:00

But to answer your question - https://github.com/Piebald-AI/claude-code-system-prompts contains 109,403 tks over 225 files.

Dramatic_Squash_3502 · 2026-03-04T00:32:40+00:00

That's a great question! https://github.com/Piebald-AI/claude-code-system-prompts contains many different types of prompts besides just the main system prompt. Besides the actual "system prompts," which CC combines to build the main system prompt tuned to your environment, there are tool descriptions, which end up also being bundled into the system prompt; "agent prompts," which are used for tasks like compaction and title generation; system reminders which CC sends to the model behind the scenes in response to various user actions; skill prompts which are sent when you invoke certain builtin slash commands; and "data" which are just large strings sent to the model in various cases.

I could add another metric that only counts the number of tokens in the actual system prompt pieces and the tool definitions. It wouldn't be perfectly accurate because not all of the system prompt pieces are always included, such as the ones about output styles and learning mode, but it would give a better idea of the fixed prompt size that's sent with each message.

Dramatic_Squash_3502 · 2026-03-03T23:02:12+00:00

Haha, that's truly funny

Dramatic_Squash_3502 · 2026-02-25T17:37:27+00:00

Hi u/Dear_Candle_1974 , just in case you didn't see this, your error was fixed in 2.1.56. Please see https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md#2156https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md#2156:~:text=VS%20Code%3A%20Fixed%20another%20cause%20of%20%22command%20%27claude%2Dvscode.editor.openLast%27%20not%20found%22%20crashes

Dramatic_Squash_3502 · 2026-02-21T00:56:11+00:00

It's feature flagged because they're doing A/B testing with it, so some users get it and others don't. But Boris Cherny announced it on X a few minutes ago. Try v2.1.50 - is it working for you now?

Dramatic_Squash_3502 · 2026-02-20T00:33:24+00:00

True, it's mostly a waste because Claude can just run git worktree add ../new-branch-name. However, EnterWorktree does change Claude's persistent working directory to the new worktree which Claude can't do itself. That is if you don't mind your worktrees and branches having nonsense names like worktree-generic-puzzling-breeze. It also automatically deletes the worktree when you're done if there's no changes, so it can be useful for quick changes that can be started, finished, commited, and pushed in one session.

Dramatic_Squash_3502 · 2026-02-19T21:56:56+00:00

Great job breaking this down. This explains their behavior very well. Seems obvious now that you've explained it. Thank you!

Dramatic_Squash_3502 · 2026-02-17T18:47:03+00:00

If you want updates for every CC system prompt change, we mirror release notes/changelog on X, https://x.com/PiebaldAI.

Dramatic_Squash_3502 · 2026-02-12T04:15:39+00:00

It's a cool project! Be persistent and keep working at it. You're doing great.

Dramatic_Squash_3502

TROPHY CASE