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fix(specialist): let Task resume continue its own specialist child - #1222
specialist.BuildResumeArgs passes --calling-session-id and --calling-tool-use-id, the same flags the fresh run passes. runResume fills them from the Task call.
New sessions.ExecResumable(session, callingSessionID, tag). Kinds IsResumableKind accepts stay resumable. A child session is resumable only when the calling session is the child's recorded parent and the tag is the child's own tag.
Both exec checks use it: the CLI preflight in internal/cli/exec_sessions.go and sessions.PrepareExec. They were two separate kind checks before, which is why a fix in PrepareExec alone still failed.
Why
Task resume runs zero exec --resume <child> on the child session that the fresh run created (kind child, tag specialist). Since #748, exec refuses every child, so every Task resume failed with Zero session is not resumable: <id>. The specialist tests launch a fake binary, so nothing caught it. docs/SPECIALISTS.md already lists Task resume as supported.
#748's intent is kept. A plain zero exec --resume <child> is still refused, and so is a resume that names another parent or another tag. Side sessions such as /btw are never children, so they stay out. ResumeLatest and the resume pickers still use IsResumableKind and are unchanged.
TestTaskResumeContinuesTheSpecialistChildThroughExec (internal/cli) runs the Task tool's real arguments through the real exec entry point in process, with no fake binary. The fresh run creates the child, the resume continues it (the provider sees Continuing Zero session child_task. and no new session is created), and two hand-written resumes are still refused. On main the resume fails: the child exits 2 with Zero session is not resumable: child_task.
TestPrepareExecResumesAChildOnlyForItsOwner (internal/sessions) covers the owner resume and six refusals: plain, tag only, caller only, another parent, another tag, and a side session. On main it fails with owner resume of a child: Zero session is not resumable: child_task.
10 mutations, all caught. Each mutation does one of these: drops the resume flag, drops the parent from runResume, refuses every child, skips the parent match (unit and end to end), skips the tag match, lets side sessions in, or puts the old kind check back in the preflight or PrepareExec.
gofmt, go vet ./... for windows, linux and darwin, go test ./..., -race on sessions and specialist, release build and smoke, golangci-lint v2.12.2 (unused, ineffassign, staticcheck) on the touched packages for windows, linux and darwin, and git diff --check.
Task resume now continues an existing specialist child session when resumed by its owning parent with the matching tag, preserving the child’s history and avoiding creation of an extra session.
Child sessions remain unavailable for direct resume or resume by a different parent.
Task resume runs `zero exec --resume <child>` on the child session the
fresh run created. Since #748, exec refuses every child session, once in
the CLI preflight and again in sessions.PrepareExec, so every Task resume
failed with "Zero session is not resumable". The specialist tests launch
a fake binary, so nothing caught it.
The resume now passes --calling-session-id and --calling-tool-use-id the
way the fresh run does, and sessions.ExecResumable lets exec continue a
child only when the calling session is the child's recorded parent and
the tag is the child's own. Both exec checks call it. A plain resume,
another parent, another tag and side sessions such as /btw are still
refused.
Fixes#1209
Specialist Task resume now passes parent context to exec. Exec accepts a child session when its caller ID and tag match the session metadata. Tests cover successful Task resume and rejected direct, mismatched, missing-context, and side-session resumes.
Changes
Specialist Task resume
Layer / File(s)
Summary
Pass parent context to specialist resume internal/specialist/exec.go, internal/cli/exec_task_resume_test.go
BuildResumeArgsInput accepts parent session and tool-use IDs. runResume passes them through, and BuildResumeArgs adds nonblank values to the child resume arguments. The in-process integration test checks that Task resume continues the existing child session without creating another session.
ExecResumable retains the existing resumable kinds and permits child sessions only when the trimmed caller ID and tag match the child metadata. Exec uses this check during resume. Tests cover matching ownership and tag, as well as rejected direct, missing, mismatched, and side-session cases.
sequenceDiagram
participant Task as Specialist Task
participant runResume
participant BuildResumeArgs
participant Exec as zero exec
participant ExecResumable
Task->>runResume: Resume with parent session and tool-use IDs
runResume->>BuildResumeArgs: Pass parent IDs
BuildResumeArgs->>Exec: Add calling-session and calling-tool-use arguments
Exec->>ExecResumable: Check session, calling session ID, and tag
ExecResumable-->>Exec: Return resumability result
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Suggested reviewers: anandh8x
Merge Risk: Minimal · up to 21cd7
Task resume can now continue its own specialist child, and other resume attempts are still refused. No merge-blocking risk was found.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
Check name
Status
Explanation
Resolution
Docstring Coverage
Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
Check name
Status
Explanation
Description Check
Check skipped - CodeRabbit’s high-level summary is enabled.
Title check
The title clearly and concisely describes the main change: allowing Task resume to continue its own specialist child.
Linked Issues check
Issue #1209 requires Task resume to continue its own specialist child through the real exec path. BuildResumeArgs and runResume pass the parent session ID and tool-use ID. ExecResumable permits …
Out of Scope Changes check
The changed implementation, CLI preflight, specialist argument propagation, and tests directly support issue #1209. The tests validate the required authorization boundaries, including side-session exc…
Full details: Linked Issues check
Explanation
Issue #1209 requires Task resume to continue its own specialist child through the real exec path. BuildResumeArgs and runResume pass the parent session ID and tool-use ID. ExecResumable permits a child only when the calling session matches the recorded parent and the tag matches the child tag. Both the CLI preflight and sessions.PrepareExec use this check. The integration test exercises the real in-process exec path and verifies continuation without a new session. It also verifies plain and wrong-parent resumes remain refused. The sessions test covers the owner and refusal cases. The change fixes behavior, so no documentation change is required.
Full details: Out of Scope Changes check
Explanation
The changed implementation, CLI preflight, specialist argument propagation, and tests directly support issue #1209. The tests validate the required authorization boundaries, including side-session exclusion and mismatched parent or tag refusal. No unrelated change is demonstrated by the supplied whole-PR summary.
Full details: Docstring Coverage
Explanation
Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 5 functions across 5 files.
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
Finishing Touches
Generate docstrings
Commit to this branch
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Generate unit tests (beta)
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only still-valid issues, skip the rest with a brief reason, keep changes
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Failed pre-merge checks:
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Write docstrings for the functions missing them to satisfy the coverage
threshold.
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Reviewing files that changed from the base of the PR and between 17fcd26 and 21cd7ae.
Files selected for processing: 5
internal/cli/exec_sessions.go
internal/cli/exec_task_resume_test.go
internal/sessions/exec_resume_owner_test.go
internal/sessions/exec_session.go
internal/specialist/exec.go
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What changed
specialist.BuildResumeArgspasses--calling-session-idand--calling-tool-use-id, the same flags the fresh run passes.runResumefills them from the Task call.sessions.ExecResumable(session, callingSessionID, tag). KindsIsResumableKindaccepts stay resumable. A child session is resumable only when the calling session is the child's recorded parent and the tag is the child's own tag.internal/cli/exec_sessions.goandsessions.PrepareExec. They were two separate kind checks before, which is why a fix inPrepareExecalone still failed.Why
Task resume runs
zero exec --resume <child>on the child session that the fresh run created (kindchild, tagspecialist). Since #748, exec refuses every child, so every Task resume failed withZero session is not resumable: <id>. The specialist tests launch a fake binary, so nothing caught it.docs/SPECIALISTS.mdalready listsTaskresume as supported.#748's intent is kept. A plain
zero exec --resume <child>is still refused, and so is a resume that names another parent or another tag. Side sessions such as/btware never children, so they stay out.ResumeLatestand the resume pickers still useIsResumableKindand are unchanged.Linked issue
Fixes #1209
Verification
TestTaskResumeContinuesTheSpecialistChildThroughExec(internal/cli) runs the Task tool's real arguments through the realexecentry point in process, with no fake binary. The fresh run creates the child, the resume continues it (the provider seesContinuing Zero session child_task.and no new session is created), and two hand-written resumes are still refused. On main the resume fails: the child exits 2 withZero session is not resumable: child_task.TestPrepareExecResumesAChildOnlyForItsOwner(internal/sessions) covers the owner resume and six refusals: plain, tag only, caller only, another parent, another tag, and a side session. On main it fails withowner resume of a child: Zero session is not resumable: child_task.runResume, refuses every child, skips the parent match (unit and end to end), skips the tag match, lets side sessions in, or puts the old kind check back in the preflight orPrepareExec.gofmt,go vet ./...for windows, linux and darwin,go test ./...,-raceon sessions and specialist, releasebuildandsmoke,golangci-lintv2.12.2 (unused, ineffassign, staticcheck) on the touched packages for windows, linux and darwin, andgit diff --check.govulncheckreports GO-2026-6859 here, as it does on main. fix: bump Go to 1.26.11 for GO-2026-6859 #1218 fixes that.Summary by CodeRabbit