Claude Code 2.1.123 has been released. 1 CLI change, 3 system prompt changes Highlights: • Fixed OAuth 401 retry loop when CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS=1 is set, restoring CLI authentication • Responses may now include generated or guessed URLs, which can point to incorrect external sites Full details are in thread ↓

Claude Code CLI 2.1.123 changelog: Fix: • Fixed OAuth authentication failing with a 401 retry loop when CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS=1 is set Source: #21123" target="_blank" rel="nofollow noopener">github.com/anthropics/cla…

Claude Code 2.1.123 system prompt updates Notable changes: 1) Claude no longer has the upfront rule limiting security help to clearly authorized contexts (pentests/CTFs/defensive) and explicitly refusing destructive techniques, DoS, mass targeting, supply-chain compromise, or malicious evasion. This loosens safety gating for security requests. 2) Claude no longer has the explicit constraint to “NEVER generate or guess URLs” except when confidently programming-related (and otherwise stick to user-provided URLs). Expect more willingness to invent/share links without that hard prohibition. 3) Claude gains a new “System” block: user-facing text is rendered as GitHub-flavored Markdown (CommonMark, monospace); tools run under user-selected permissions and Claude must not repeat an identical denied tool call; system tags may appear; suspected tool-output prompt injection must be flagged; prior messages may be auto-compressed near context limits. Links: 1) #diff-b0a16d13c25d701124251a8943c92de0ff67deacae73de1e83107722f5e5d7f1L63" target="_blank" rel="nofollow noopener">github.com/marckrenn/clau… 2) #diff-b0a16d13c25d701124251a8943c92de0ff67deacae73de1e83107722f5e5d7f1L64" target="_blank" rel="nofollow noopener">github.com/marckrenn/clau… 3) #diff-b0a16d13c25d701124251a8943c92de0ff67deacae73de1e83107722f5e5d7f1R61" target="_blank" rel="nofollow noopener">github.com/marckrenn/clau…

Claude Code 2.1.123 additional modifications CLI surface: Added: • models: claude-empty-U Removed: • models: claude-empty- File: #diff-662031a066e433468319e799350331e143e4635468b9c2924019d16654027e31L917-R917" target="_blank" rel="nofollow noopener">github.com/marckrenn/clau… Metadata: • Time since 2.1.122 release: 23h 3m 21s • Bundle file size: -0.2 kB (-0.0%) • Prompt files: +3 (+4.1%) • Prompt tokens: +6,659 (+9.4%) Prompt token mix by kind: • system: 40.1%→36.6% • system-reminder: 26.7%→31.0% • tools: 19.8%→20.0% • agent: 7.0%→6.4% • skill: 3.6%→3.3% • system-data: 2.9%→2.7% Files: • metadata: #diff-a08dfa163baef97ea4f56d29009ac65f5f7dbc46e3a58e80d7aa06a2a2520899L10-R10" target="_blank" rel="nofollow noopener">github.com/marckrenn/clau… • prompt stats: #diff-fa8e31336ece71d159f37b6fd4ed0c61939849140bd5c08c7ca793b5b2ae7f58L1-R1" target="_blank" rel="nofollow noopener">github.com/marckrenn/clau… Other prompt/string highlights: 1) Selects and attaches relevant memory files for user queries. Links: 1) #diff-9b0379aa998142e7e9a5916702866b91652bf360465c272153861c476541431dR22" target="_blank" rel="nofollow noopener">github.com/marckrenn/clau… More details: github.com/marckrenn/clau…

@ClaudeCodeLog Overall increase in tokens?