* fix(#2598): declare OpenCode subagent dispatch synchronous, not background capabilities/opencode/capability.json advertised dispatch.background: true and dispatch.backgroundDispatch: true. negotiateHostCapabilities and every degradationFor / shouldFlattenDispatch consumer trusts these per-field values, so declaring a capability the host lacks OVERSTATES it — the opposite of the fail-closed posture the negotiation is built for. The issue's own citations needed checking before acting: the host-integration matrix (ADR-1239's designated deployment source-of-truth) documented `true` with NEWER evidence than the issue cited, and explicitly marked the issue's sst/opencode#5887 reference as a stale snapshot superseded by #2087. git log confirms #2087 deliberately flipped these from false to true, citing OpenCode v1.15.0/v1.17 as "background subagents enabled by default in all modes". Applying the issue as filed would, on that evidence, have REGRESSED a deliberate update. So the claim was verified against current upstream rather than either document. `packages/opencode/src/effect/runtime-flags.ts` on `dev` today reads: experimentalBackgroundSubagents: enabledByExperimental("OPENCODE_EXPERIMENTAL_BACKGROUND_SUBAGENTS") `enabledByExperimental` falls back to the `experimental` flag and `bool()` defaults to false — the parameter is hidden from the model unless an operator opts in by env var. Upstream #29638 is still OPEN and confirms the session loop `tasks.pop()`s one subtask at a time. #2087's "default-on in all modes" reading does not hold against current dev. The issue's CONCLUSION is therefore right even though part of its evidence was superseded: concurrent dispatch cannot be relied on, so both fields are false. The matrix rows are corrected with the verified citation rather than reverted to the old #5887 quote, so the record shows why the value is false TODAY rather than re-asserting evidence that was legitimately superseded. Neighbouring sub-fields are untouched and pinned by test: namedDispatch, subagentToolkit, and isolation:'orchestrator-worktree' (which works via `opencode run --dir` at the OS process level and is unaffected — #2584 does not depend on this value either way). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015TCwhbMuY37DzRMCfzTABJ * fix(#2598): re-pin the dispatch contract tests to synchronous OpenCode dispatch gsd-test on the descriptor change came back FAILED (5 unique, both node versions). The failures were not incidental — they were deliberate contract-pin tests encoding #2087's decision, one named literally "background UPGRADE": tests/host-integration-descriptors.test.cjs - EXPECTED_FLATTEN[opencode] === false (background-eligible) - the derived background-eligible set pin tests/opencode-imperative-reference.test.cjs - "descriptor declares background dispatch true/true (v1.15/v1.17 upgrade)" - "background UPGRADE changes shouldFlattenDispatch: false now" So this is a recorded decision being reversed, not drift being corrected, and it is reversed on evidence: current upstream `dev` gates the capability behind OPENCODE_EXPERIMENTAL_BACKGROUND_SUBAGENTS (default false) and upstream #29638 (OPEN) confirms the session loop still handles one subtask at a time. The issue is filed by the maintainer and explicitly directs "update golden-parity / validator fixtures as needed", which sanctions re-pinning. Behavioral consequence, verified: shouldFlattenDispatch(opencode) now returns TRUE, so GSD serializes opencode dispatch instead of trusting concurrency it cannot get. That is the correct fail-closed direction and is safe today — no shipped GSD flow drives OpenCode background waves (per the issue), and isolation:'orchestrator-worktree' is unaffected because it works at the OS process level via `opencode run --dir`, not via the native subagent. Each re-pinned test now asserts the retracted contract in the opposite direction — feeding the #2087 axes back in must still yield "would not flatten" — so a silent re-flip of either field is caught rather than merely un-asserted. lint:ci exit 0. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015TCwhbMuY37DzRMCfzTABJ * chore(#2598): backfill changeset pr number (#2682) --------- Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Tom Boucher
@@ -142,9 +142,9 @@ Documentation gaps:
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| dispatch.namedDispatch | true | https://opencode.ai/docs/agents | "\"Subagents can be invoked: Automatically by primary agents for specialized tasks based on their descriptions. Manually b" |
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| dispatch.nested | undocumented | no authoritative doc — searched: https://opencode.ai/docs/agents | — |
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| dispatch.maxDepth | undocumented | no authoritative doc — searched: https://opencode.ai/docs/agents | — |
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| dispatch.background | true | https://github.com/anomalyco/opencode/blob/dev/packages/opencode/src/tool/task.ts (v1.15.0, commit 22de34c4d) + src/effect/runtime-flags.ts (v1.17, commit 81f6e0668) | "New in v1.15.0: experimental background subagents — the Task tool gains a `background` parameter (`Schema.optional(Schema.Boolean)`) that launches subagents asynchronously with completion notifications. v1.17: `BACKGROUND_SUBAGENTS_ENABLED = true` (\"feat: enable background subagents by default\") — default-on, concurrent execution in all modes. (#2087, superseding the stale sst/opencode#5887 snapshot)" |
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| dispatch.background | false | https://github.com/anomalyco/opencode/blob/dev/packages/opencode/src/effect/runtime-flags.ts ; https://github.com/anomalyco/opencode/issues/29638 | "`experimentalBackgroundSubagents: enabledByExperimental(\"OPENCODE_EXPERIMENTAL_BACKGROUND_SUBAGENTS\")` — `enabledByExperimental` falls back to the `experimental` flag, and `bool()` defaults to `false`, so the Task tool's `background` parameter is hidden from the model unless the operator opts in by env var. #29638 (OPEN) confirms the session loop still `tasks.pop()`s one subtask at a time. (#2598 — corrects #2087, whose \"v1.17 default-on in all modes\" reading does not hold against current `dev`)" |
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| dispatch.subagentToolkit | full | https://opencode.ai/docs/agents | "The 'general' subagent \"Has full tool access (except todo), so it can make file changes when needed.\"" |
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| dispatch.backgroundDispatch | true | https://github.com/anomalyco/opencode/blob/dev/packages/opencode/src/effect/runtime-flags.ts (v1.17, commit 81f6e0668) + src/server/routes/instance/httpapi/handlers/experimental.ts | "v1.17 `BACKGROUND_SUBAGENTS_ENABLED = true` enables background subagent execution by default in all modes; the experimental capabilities endpoint exposes `{ backgroundSubagents: true }`. Background-spawned subagents run concurrently without blocking the main interaction flow. (#2087)" |
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| dispatch.backgroundDispatch | false | https://github.com/anomalyco/opencode/blob/dev/packages/opencode/src/effect/runtime-flags.ts ; https://github.com/anomalyco/opencode/issues/29638 ; https://github.com/anomalyco/opencode/issues/14195 | "Concurrent dispatch requires the opt-in `OPENCODE_EXPERIMENTAL_BACKGROUND_SUBAGENTS` flag (default `false`), so it cannot be relied on. #14195: \"the session loop does `tasks.pop()` to grab a single subtask, `await`s it, then `continue`s the loop — so even 3 simultaneous Task calls run sequentially.\" Declaring `true` would overstate the capability, against the fail-closed posture negotiation is built for. (#2598 — corrects #2087)" |
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| dispatch.isolation | orchestrator-worktree | https://opencode.ai/docs/cli ; opencode.ai/docs/plugins ; opencode issues #14195/#29638/#5887 | "`opencode run --dir <path>` sets an explicit working root at the process level" — native subagent dispatch is synchronous-only, so GSD creates + manages the worktree and process-spawns the executor into it via `--dir` (#2584) |
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Sources consulted:
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