System reminder: hook pretool block

v2.1.284 system reminder: hook pretool block

SDK-CLI The prompt of v2.1.284, as Agent SDK, print mode sent it to the model, read out of the request it put on the wire. The text comes first; what changed since the previous capture is further down, kept apart from it.

This is the system reminder: hook pretool block request, captured on its own. Its system array, its tools and every count below are this request's, not the ordinary one's. The injected-prompt ledger lists every surface the rig reaches.

Released28 Sep 26captured 28 Sep 26

Compared withv2.1.283the previous capture taken the same way

Prompt55 ln5,642 characters

Model strings11 copy of the prompt between them

Tool descriptions20 1 moved this release, 20 with a parameter schema

hook-pretool-block · 1 line, 92 characters · ○Same as v2.1.283

PreToolUse:Bash hook error: [/home/corpus/.claude/hooks/block.sh]: SENTINEL_HOOK_STDERR_0011

The system array of this request55 lines, line by line
As plain textthe same system array as a .txt, to download or diff
20 tool descriptionsthe text the model is given for each tool
1 appended block8,140 more characters the client sends after the system array
18 prompts in this releasecompaction, subagents, reminders: each its own request

What changed since the previous capture

2 One line per document that moved, the system prompt and the tool descriptions in the same table.

1 added and 1 removed, of 55 lines, about 4 words, in the prompt all 1 arms receive. 1 of 20 tool descriptions changed. Compared against v2.1.283.

PromptReachMovedThe first line that changed

System prompt 55 ln all 1 arms +1−1 - The most recent Claude models are the Claude 5 family and Haiku 4.5. Model IDs — Fable 5.1: 'claude-fable-5-1', Opus 5.5: 'claude-opus-5-5', Sonnet...

WebSearch 5 ln all 1 arms +1−1 - The current month is September 2026 — use this when searching for recent information.

The prompt by model

1 The client does not send one system prompt: each model gets its own copy with its name and a few lines worked in. A row is one copy and how many of the 1 model strings get it, most first.

#CopyLengthSent toDocumentsOpens with

1 (unset) 55 ln · 5.6k 1 of 1 1 copy You are an interactive agent that helps users with software engineering tasks.

Tool descriptions

20 The text the model is given for each tool, on this arm.

All 20 tool descriptions →

ToolDescriptionCopiesMoved

Agent 1,668 chars 1 ○same

Bash 919 chars 1 ○same

CronCreate 2,924 chars 1 ○same

CronDelete 167 chars 1 ○same

CronList 106 chars 1 ○same

Edit 360 chars 1 ○same

EnterWorktree 3,220 chars 1 ○same

ExitWorktree 1,923 chars 1 ○same

ListAgents 777 chars 1 ○same

NotebookEdit 619 chars 1 ○same

Read 790 chars 1 ○same

ReportFindings 574 chars 1 ○same

ScheduleWakeup 3,396 chars 1 ○same

SendMessage 4,259 chars 1 ○same

Skill 1,417 chars 1 ○same

TaskStop 378 chars 1 ○same

WebFetch 469 chars 1 ○same

WebSearch 334 chars 1 ◆moved

Workflow 3,480 chars 1 ○same

Write 240 chars 1 ○same