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Β¬ just serendipity πŸ€

β˜… claude: add session ID to status bar

β€’ 864 words β€’ 5 min β€’ updated

Desired outcome:

❯ claude

 β–β–›β–ˆβ–ˆβ–ˆβ–œβ–Œ   Claude Code v2.1.63
β–β–œβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–›β–˜  Opus 4.6 Β· Claude Team
  β–˜β–˜ ▝▝    ~/.dotfiles

──────────────────────────────────────────────────────────
❯
──────────────────────────────────────────────────────────
  .dotfiles (git:master*) [Opus 4.6] [β–ˆβ–‘β–‘β–‘β–‘] $0.00 sid:9afc33ee-610d-47cc-8bde-1a52d1b22832

The status bar displays the current:

  • git repository we’re on
  • git branch
  • model name
  • context window usage (%)
  • session cost (in USD)
  • session ID

I recently added the last two items, and the post title reflects that.

The session cost is helpful as a pat on the shoulder to remind you of how expensive Anthropic models are. If you want to put a cap on the session, --max-budget-usd could be helpful:

--max-budget-usd <amount>		Maximum dollar amount to spend on API calls (only works with --print)

The session ID is, by itself, useless. It is just a boring UUID, auto-generated whenever a new session is started.

That said, the session ID can become powerful when you start to treat sessions as first-class citizens (e.g. like how Amp Code does to threads).

Use cases #

Use case #1: resume a previous session.

shell 
claude [-r | --resume] <uuid>
-r, --resume [value]		Resume a conversation by session ID, or open interactive picker with optional search term

This is useful whenever you know in advance you’ll need to close your terminal (e.g. to restart your computer for system upgrades).

Use case #2: multiple divergent explorations.

shell 
claude --fork-session [-r | --resume | -c | --continue] <uuid>
--fork-session				 When resuming, create a new session ID instead of reusing the original (use with --resume or --continue)

Whenever you reach a point of ambiguity when vibe coding, you may want to explore multiple paths. --fork-session creates new sessions from an existing context window (session ID), allowing you to preserve your original session context.

Use case #3: refer to other sessions.

Sample prompt:

let's continue work from sid:484b8360-b5ee-4a47-9137-f45c00ff2dc0

this foo path is too slow, make it faster by activating the infinite
improbability module

The config #

The resulting diff:

diff 
thiago.perrotta ~/.dotfiles git:master
❯ git --no-pager show 0f94082
commit 0f9408223c60dcda980c18787d3d0c1519428c30
Author: Thiago Perrotta <{redacted}>
Date:   Fri Feb 27 16:56:57 2026 +0100

    claude: status bar: add session ID, add cost

diff --git claude/.claude/statusline.sh claude/.claude/statusline.sh
old mode 100644
new mode 100755
index 785b5f3..f43527a
--- claude/.claude/statusline.sh
+++ claude/.claude/statusline.sh
@@ -5,8 +5,10 @@ input=$(cat)

 # Extract information from JSON
 model_name=$(echo "$input" | jq -r '.model.display_name')
+session_id=$(echo "$input" | jq -r '.session_id')
 current_dir=$(echo "$input" | jq -r '.workspace.current_dir')
 output_style=$(echo "$input" | jq -r '.output_style.name')
+cost=$(echo "$input" | jq -r '.cost.total_cost_usd')

 # Get current working directory basename
 dir_name=$(basename "$current_dir")
@@ -87,5 +89,15 @@ if [[ -n "$context_info" ]]; then
     status_parts+=("$context_info")
 fi

+# Add cost
+if [[ -n "$cost" && "$cost" != "null" ]]; then
+    status_parts+=("$(printf '$%.2f' "$cost")")
+fi
+
+# Add session ID
+if [[ -n "$session_id" && "$session_id" != "null" ]]; then
+    status_parts+=("sid:$session_id")
+fi
+
 # Join parts with spaces and print
 printf "%s" "$(IFS=' '; echo "${status_parts[*]}")"

The full status line config. I’ll inline it here for completeness:

shell 
#!/bin/bash

# Read JSON input from stdin
input=$(cat)

# Extract information from JSON
model_name=$(echo "$input" | jq -r '.model.display_name')
session_id=$(echo "$input" | jq -r '.session_id')
current_dir=$(echo "$input" | jq -r '.workspace.current_dir')
output_style=$(echo "$input" | jq -r '.output_style.name')
cost=$(echo "$input" | jq -r '.cost.total_cost_usd')

# Get current working directory basename
dir_name=$(basename "$current_dir")

# Get git information if in a git repository
git_info=""
if git rev-parse --git-dir > /dev/null 2>&1; then
    branch=$(git branch --show-current 2>/dev/null)
    if [[ -n "$branch" ]]; then
        # Check for uncommitted changes
        if ! git diff --quiet 2>/dev/null || ! git diff --cached --quiet 2>/dev/null; then
            dirty="*"
        else
            dirty=""
        fi

        # Check if in a linked worktree (not the main worktree)
        worktree_info=""
        git_dir=$(cd "$(git rev-parse --git-dir 2>/dev/null)" && pwd)
        git_common_dir=$(cd "$(git rev-parse --git-common-dir 2>/dev/null)" && pwd)
        if [[ "$git_dir" != "$git_common_dir" ]]; then
            # We're in a linked worktree - show its name
            worktree_path=$(git rev-parse --show-toplevel 2>/dev/null)
            worktree_name=$(basename "$worktree_path")
            worktree_info=" βŽ‡ $worktree_name"
        fi

        git_info="(git:$branch$worktree_info$dirty)"
    fi
fi

# Calculate context window usage (relative to auto-compact threshold ~80%)
context_info=""
usage=$(echo "$input" | jq '.context_window.current_usage')
if [ "$usage" != "null" ]; then
    # Include output_tokens for accurate context measurement
    current=$(echo "$usage" | jq '.input_tokens + .output_tokens + .cache_creation_input_tokens + .cache_read_input_tokens')
    size=$(echo "$input" | jq '.context_window.context_window_size')

    # Auto-compact triggers at ~80% of context window
    compact_threshold=$((size * 80 / 100))

    # Calculate percentage toward auto-compact (capped at 100%)
    pct=$((current * 100 / compact_threshold))
    if [ "$pct" -gt 100 ]; then pct=100; fi

    # Create progress bar (5 characters wide)
    filled=$((pct / 20))
    empty=$((5 - filled))
    bar=""
    for ((i=0; i<filled; i++)); do bar+="β–ˆ"; done
    for ((i=0; i<empty; i++)); do bar+="β–‘"; done

    context_info="[${bar}]"
fi

# Build status line
status_parts=()

# Add current directory
status_parts+=("$dir_name")

# Add git info if available
if [[ -n "$git_info" ]]; then
    status_parts+=("$git_info")
fi

# Add model name
status_parts+=("[$model_name]")

# Add output style if not default
if [[ "$output_style" != "default" && "$output_style" != "null" ]]; then
    status_parts+=("{$output_style}")
fi

# Add context usage if available
if [[ -n "$context_info" ]]; then
    status_parts+=("$context_info")
fi

# Add cost
if [[ -n "$cost" && "$cost" != "null" ]]; then
    status_parts+=("$(printf '$%.2f' "$cost")")
fi

# Add session ID
if [[ -n "$session_id" && "$session_id" != "null" ]]; then
    status_parts+=("sid:$session_id")
fi

# Join parts with spaces and print
printf "%s" "$(IFS=' '; echo "${status_parts[*]}")"

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#ai #bestof #claude #dev

claude code: naming sessions

Previously. Problem statement: claude --resume accepts a session ID (UUID), but UUIDs are not human-friendly. shell % claude --resume …

Apr 12, 2026

Previously, previously, previously, previously, previously.

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