fix(sessions): render resume context fields in key order - #1043
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Greptile SummaryThe PR makes resumed-session prompt context deterministic by sorting map keys before recursively extracting their values.
Confidence Score: 5/5The PR appears safe to merge. The implementation replaces nondeterministic map traversal with lexical key traversal while preserving existing special cases, and the added tests cover both direct maps and store-shaped raw JSON.
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| Filename | Overview |
|---|---|
| internal/sessions/exec_session.go | Sorts map keys before recursive text extraction without changing field selection, summary handling, or list ordering. |
| internal/sessions/exec_prompt_order_test.go | Adds focused regression tests for deterministic map rendering and preserved summary and list semantics. |
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Included review availability: 3 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour. WalkthroughThe session prompt renderer now sorts JSON object keys before extracting text. Tests verify deterministic payload ordering, stable resume-context rendering, summary precedence, and list-order preservation. ChangesSession prompt ordering
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The deterministic rendering tests cover sorted map fields, raw JSON, summary precedence, list ordering, and repeated resume-context output. No merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Inline comments:
In `@internal/sessions/exec_prompt_order_test.go`:
- Line 96: Update the test around renderOrderContext to assert the first
rendered result against a literal canonical resume-context block before
comparing repeated renders. Preserve the existing stability comparison while
ensuring the test validates the required non-lexicographic field order.
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internal/sessions/exec_prompt_order_test.gointernal/sessions/exec_session.go
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extractText walked a map[string]any directly and Go randomizes map
iteration, so the same session put the same fields in a different order in
every process: one run rendered a tool call as c1 read_file {"path":...},
the next as {"path":...} c1 read_file. That block is part of the user
prompt, so the prompt itself changed run to run, which leaves a provider
nothing stable to prefix-cache for it and makes two resumes of one session
impossible to diff while debugging.
Only the ordering is decided here. The summary short-circuit is untouched,
a list keeps the order it was written in, and which fields survive at all
stays the caller's projection.
Pinned as exact rendered strings rather than as two renders agreeing: a
same-process repeat passes whenever the random order happens to repeat,
which for a small map is often. The raw-JSON case proved it while being
written, matching on the first five attempts before diverging on the sixth.
Closes #1020
…render Comparing later renders against the first only asks whether the renderer is stable, and a renderer that is stably wrong passes it: any fixed field order satisfies it, including the unsorted one this change replaces. It also hid something. The events were tool calls, which promptContextEvents filters out of the resume context on this branch, so the block being compared was a single message line and nothing said so. The test now names the block it expects, on events that survive the filter, and both failures are visible.
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Closes #1020.
extractTextwalked amap[string]anydirectly, and Go randomizes map iteration, so the same session rendered its resume context with the fields in a different order in every process: one run producedand the next
That block goes into the user prompt, so the prompt itself changed run to run. A provider has nothing stable to prefix-cache for it, and two resumes of one session cannot be diffed while debugging.
Keys are sorted before the walk. Only the ordering is decided there: the
summaryshort-circuit above is untouched, a list keeps the order it was written in, and which fields survive at all remains the caller's projection.On the tests
Pinned as exact rendered strings, not as two renders agreeing. A test that renders the same payload twice in one process and compares passes whenever the random order happens to repeat, which for a four-key map is often, so it would have been a test that mostly passes on the broken code. The raw-JSON case demonstrated that while being written: it matched on the first five attempts and diverged on the sixth.
Coverage is the exact line for a map payload, the same for one arriving as raw JSON (the shape the store hands back), the summary short-circuit still winning, a list keeping its written order, and the whole context block rendering identically across fifty renders through
promptContextEvents, so a future renderer that walks a map of its own is caught here too.All of them fail on
mainand pass with the change. Reversing the sort order fails the two exact-string cases immediately.Noticed while writing the tool-context tests for #1016, which compare fields as a set to work around it. Not introduced there; this is on
maintoday and that PR only made it visible. Once this lands, those tests could compare whole lines instead, though I have left them alone here to keep the two PRs independent.Summary by CodeRabbit