Release v0.34.42

What's Changed

• feat(usage): compute api_cost_usd client-side for local and cloud agents by @cpacker in #5524
• feat(listener): trace permission mode transitions by @letta-integration[bot] in #5477
• fix(startup): keep the agent's context window on a same-model tier change by @devanshrj in #5537
• refactor(model): share the model-selection context window preserve rule by @devanshrj in #5538
• fix(local): skip pressure compaction that can't get under the threshold by @letta-integration[bot] in #5154
• docs(models): remove stale adding-models skill by @devanshrj in #5539
• fix(permissions): check the expanded file path the tool will actually open by @letta-integration[bot] in #5541
• fix(subagents): link Cloud child conversations to their parent by @dream-integration[bot] in #5542
• docs(skills): GPT Image 2.6 and prompting techniques in image-generation by @dream-integration[bot] in #5544
• fix(listener): detect a reused pid via process start time by @letta-integration[bot] in #5548
• chore: bump version to 0.34.42 by @github-actions[bot] in #5546

New Contributors

• @dream-integration[bot] made their first contribution in #5542

Full Changelog: v0.34.41...v0.34.42