The user has asked for a retrospective. You are suggesting improvements to the coding agent's environment to improve future runs.

Steps

Call the Skill tool with writing-for-agents for the writing style guide.
List every session for the current repo, unless the user names a narrower set. In T3 Code, call t3_thread_list with no projectId: it defaults to this thread's project, which spans the main checkout and every worktree (deleted ones included), every provider, and settled threads. Page with cursor until nextCursor is null.

Outside T3 Code, list session logs on disk instead. A log belongs to the repo when its working directory is the main checkout or any of its worktrees, including worktrees deleted since, whose logs outlive them. Get the checkouts from git worktree list, and count every directory beside a linked worktree (same parent folder) as one of the repo's past worktrees.
- Claude Code: ~/.claude/projects/<dir>/*.jsonl, where <dir> is the checkout path with each / and . replaced by -.
- Codex: ~/.codex/sessions/YYYY/MM/DD/*.jsonl, where the first line's payload.cwd holds the working directory.
Done when every page or matching log file is on the list.
Read the sessions through subagents, one batch each, since together they are too large to read inline. In T3 Code, a subagent reads each thread with t3_thread_read and view: "activity", which carries tool calls and reasoning beside the messages, paging with afterPosition. Each subagent returns the friction in its batch: places the agent searched long, made a mistake, retried, or was corrected by the user, each with its thread ID or log file and a quoted excerpt. Done when every listed session is covered by a returned batch.
Look for candidates for improvement in these categories, using the friction as evidence.