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OpenCode reports an oversized session as a bare InvalidRequest, so the run failed with the provider's generic 'invalid parameters' text and every retry failed identically. When the window is known and this turn's observed input already meets it, fail with what actually happened plus the recovery (fork from an earlier completed run or start fresh). Anything without size evidence keeps the original error.
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| }): string | null => { | ||
| if (input.causeTag !== "InvalidRequestError") return null; | ||
| if (input.windowTokens === undefined || input.steps === 0) return null; | ||
| if (input.inputTokens < input.windowTokens) return null; |
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🟠 High v2/oversizedSession.ts:24
After multiple requests that each fit the context window, this check can still classify an unrelated InvalidRequestError as an oversized session because inputTokens is cumulative across steps. That replaces the real error with a false instruction to fork or start over; use per-request context usage such as turn.lastStep instead.
Also found in 1 other location(s)
packages/provider-opencode/src/server/v2/adapter.ts:3719
turn.usage.inputis cumulative across steps (session.step.ended/failedadds each step's input at adapter.ts:2168), not the session's context size. For example, three 80k-token steps in a 200k window produce 240k here despite every request fitting. A subsequent unrelatedInvalidRequestErrorthen loses its original message and falsely tells the user the session is irrecoverably oversized and must be forked/replaced. Use per-request context evidence (such asturn.lastStep, already used for context usage at lines 1625–1628), rather than aggregate billed input, for this check.
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In file @packages/provider-opencode/src/server/v2/oversizedSession.ts around line 24:
After multiple requests that each fit the context window, this check can still classify an unrelated `InvalidRequestError` as an oversized session because `inputTokens` is cumulative across steps. That replaces the real error with a false instruction to fork or start over; use per-request context usage such as `turn.lastStep` instead.
Also found in 1 other location(s):
- packages/provider-opencode/src/server/v2/adapter.ts:3719 -- `turn.usage.input` is cumulative across steps (`session.step.ended`/`failed` adds each step's input at adapter.ts:2168), not the session's context size. For example, three 80k-token steps in a 200k window produce 240k here despite every request fitting. A subsequent unrelated `InvalidRequestError` then loses its original message and falsely tells the user the session is irrecoverably oversized and must be forked/replaced. Use per-request context evidence (such as `turn.lastStep`, already used for context usage at lines 1625–1628), rather than aggregate billed input, for this check.
ApprovabilityVerdict: Would Approve Macroscope's review found this PR approvable — This is a small, self-contained OpenCode bug fix that changes only the failure message for an oversized session and adds targeted tests. An unresolved High-severity finding reports that cumulative token usage can misclassify unrelated InvalidRequest failures, so that correctness issue must be fixed before merge. Needs human approval because:
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| Check name | Status | Explanation |
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The title is concise, specific, and accurately describes the main change: an actionable OpenCode error when a session exceeds the model context window. |
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The description clearly explains the problem, the fix, scope boundaries, recovery behavior, and verification results. It uses a Fix heading instead of Change and does not include an explicit maintaine… |
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The description clearly explains the problem, the fix, scope boundaries, recovery behavior, and verification results. It uses a Fix heading instead of Change and does not include an explicit maintainer approval comment, but the linked issue and focused scope provide sufficient context.
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Inline comments:
Review comments at @packages/provider-opencode/src/server/v2/adapter.ts:
- Line 3719: Update the error handling that uses turn.usage.input to classify
InvalidRequestError: use token evidence for the individual rejected request
rather than the cumulative usage across steps, and preserve the original error
when per-request evidence is unavailable.
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📒 Files selected for processing: 3
packages/provider-opencode/src/server/v2/adapter.tspackages/provider-opencode/src/server/v2/oversizedSession.test.tspackages/provider-opencode/src/server/v2/oversizedSession.ts
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turn.usage.input accumulates across steps, so several fitting steps could sum past the window and misclassify a later unrelated InvalidRequest. Use the last completed step's input (the live context size, same basis as the reported turn token usage) instead.
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Review feedback addressed in ba63cde: the check no longer uses cumulative turn usage. It now compares the last completed step's input (the live context size, same basis as the reported turn token usage) against the known window, so several fitting steps can no longer sum past it and misclassify a later unrelated InvalidRequest. Added a regression case for exactly that scenario (80k last step vs 200k window with a larger cumulative total). PR body updated to Fixes #20142 so the Development section links the issue. |
juliusmarminge
added
bugfix
Problem
An OpenCode session that outgrows the model's context window dies with the provider's generic text: "The request contains invalid parameters. Check the request body for any errors or inconsistencies." (
provider.invalid-request). Nothing indicates size is the cause, so every retry fails identically — I watched this kill four long-running threads across three projects (#20142, with per-incident evidence).Fix
In the v2 adapter's submit drain-failure path, when the rejection is
InvalidRequestErrorand there is positive size evidence (the model window is known and this turn's observed input already meets it), the terminal failure now says what actually happened and how to recover:Anything without size evidence (unknown window, refused first prompt, genuine malformed request) keeps the exact original error — verified by unit cases for each branch.
Deliberately out of scope: reaping the lingering
opencode serve. That server is instance-shared with a 30s idle TTL (OpenCodeServerOwner) and is needed for the very recovery this message prescribes (retry/fork reuses the session), so killing it on failure would break recovery, not fix it.Verification
oversizedSession.test.ts: 5/5 pass (fires at/above window, ignores other rejections, below-window requests, unknown windows, prompt-less failures).provider-opencodesuite: 16 files / 128 tests pass.tsc --noEmit: clean (only pre-existing suggestions elsewhere).vp linton all three touched files: clean.Fixes #20142. See also #19986 (fork-while-running) and discussion #23540 (queued forks) — this PR covers the error-mapping half; those cover the fork-UX half.
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