[JacobStephens2]

Summary

While a Run is going, stderr now shows its progress, and stdout still carries only the PR URL.

 run
+  "thirdshift: creating worktree … on issue-7 from origin/main"
   Worktree::create_fresh
+  "thirdshift: logging the session to ~/.thirdshift/logs/…-implement.jsonl"
   session::run("implement", …)
-    claude stdout → log file
+    claude stdout → follow(): each line → log file + Progress::condense → stderr
+    "thirdshift: implement: session ended after 5m 32s: 34 turns, $1.82 at API prices"
+  "thirdshift: pushing issue-7"
   git push
+  "thirdshift: checking the PR"
   gh pr view
+  "thirdshift: merging origin/main into issue-7"
   Worktree::merge_base_branch
   if conflicted:
+    "thirdshift: merging origin/main conflicted; starting a Repair"
+    "thirdshift: logging the session to ~/.thirdshift/logs/…-repair-1.jsonl"
     session::run("repair-1", …)
+  "thirdshift: pushing issue-7"
   Worktree::push
+  "thirdshift: cleaning up the worktree and local branch issue-7"

src/progress.rs holds progress::step for thirdshift's own steps, and Progress, a pure condenser that turns one stream line into zero or more lines:

system/init (first only)  → session started          (later inits: resumptions, skipped)
tool_use Skill            → skill thirdshift:code-review
tool_use Bash git commit  → commit    / git push → push / both → commit and push
tool_use Bash other       → $ <first line, ≤100 chars>
tool_use Read/Edit/…      → Edit src/run.rs          (path relative to the session cwd)
result                    → nothing; totals kept, the last one reported when claude exits
anything else / malformed → skipped

This follows the issue comment. A result event doesn't end the session. total_cost_usd is taken from the last result, not summed. Only the first init prints "session started". "At API prices" appears only when apiKeySource is "none" (a claude.ai subscription).

Seams tested:

• the Progress interface (condense and summary), with unit tests in src/progress.rs
• the thirdshift binary's stderr and stdout, driven by the fake claude emitting stream-json in tests/progress_lines.rs

Evidence

• Before: cargo test --test progress_lines: 3 failed. stderr: [], and "missing "thirdshift: implement: session started"".
  After: cargo test: 14 unit + 8 fresh-run + 5 progress-lines tests pass. After merging main: all 45 tests pass, including mergeable and preflight. clippy and fmt are clean.

prints_one_line_per_notable_session_event                     skill / Read src/lib.rs / commit / push
reports_the_last_result_once_the_session_exits_even_after_several
  results(10, $0.50), init, results(34, $1.82) → 1 "session started", 1 "session ended … 34 turns, $1.82"
prints_a_line_for_each_of_its_own_steps                       in order
skips_unknown_and_malformed_stream_events_and_keeps_stdout_to_the_pr_url
still_logs_the_whole_stream

Merge Danger

Door: two-way

The change only adds stderr output. The log file still gets every byte of the stream.

Blast Radius: stderr

Anything that parsed thirdshift's stderr now sees more lines. claude stdout is now read through a pipe rather than written straight to the log file. If following the stream fails, claude is killed and waited on before the error is returned.

Unaddressed findings

Standards

• session::run prints instead of returning results: the formatting logic is in the pure Progress, which is unit-tested. What remains in session::run is the I/O glue.
• step and Progress share a module: they are the two halves of "progress on stderr". Splitting them would add a module and no depth.
• The kind "implement" is passed to both log_path and run; session::run has five positional params: the Repair (Keep the PR mergeable: merge the Base branch and conflict Repair #17) now shares the run_session closure in run.rs, which passes kind through, so the call sites stay short.
• tool_use test helper is duplicated in unit and integration tests: unit tests can't reach tests/support, and the copy is small.

Spec

• No line for waiting for CI: that step doesn't exist yet. It should print its line when it is built. Merging the Base branch and starting a Repair came in from main (Keep the PR mergeable: merge the Base branch and conflict Repair #17) and print their lines.
• Extra "logging the session to …" step, the elapsed time, and relative paths and details on tool lines: all are small and help you follow a 10–40 minute run. The log path is the only way to find the full stream.
• claude's own stderr passes through without the thirdshift: prefix: that is claude's error output. Showing it raw is the most useful thing when a session fails, and stdout is unaffected.

Closes #10

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