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+# Render agent definitions from templates at install/config-change time
+
+**Source:** [#2758](https://github.com/gsd-build/get-shit-done/issues/2758)
+**Decision:** wontfix — closed on the technical merits
+**Date:** 2026-05-02
+
+## Proposal summary
+
+Move config-gated prose out of `agents/*.md` into `agents/templates/*.md.tmpl`,
+rendered at install time and after `.planning/config.json` writes via a new
+`gsd-sdk agents render` subcommand. Conditional branches resolve at render time
+(deterministic code) instead of at inference time (LLM interpretation).
+
+Three named benefits:
+
+1. Token reduction proportional to disabled features.
+2. Deterministic feature gating (impossible-by-construction vs. test-for).
+3. Single source of truth for contributor-facing gating.
+
+Cites PR #2279 (Codex/OpenCode model embedding at install time) as direct
+precedent for compile-time embedding.
+
+## Why GSD does not own this
+
+### 1. The determinism claim is theoretical, not observed
+
+The proposal's strongest argument is that config-gated branches in agent prose
+are a determinism failure surface. The actual patterns in the codebase today are
+already heavily mitigated:
+
+- The `use_worktrees` branch in `gsd-executor` is resolved deterministically via
+  `gsd-sdk query config-get` in bash — it is not LLM-interpreted.
+- "Skip if `workflow.X` is `false`" prose patterns are short, stable, and
+  follow a uniform "missing key = enabled" convention. There is no documented
+  history of LLMs running disabled checks or skipping enabled ones because of
+  this prose.
+
+A theoretical failure surface should not be traded for a real, high-risk
+patch-migration surface (`gsd-local-patches/` rebase logic, by the reporter's own
+admission "the highest-risk piece of the change"). The reporter was asked for
+documented evidence; none was provided.
+
+### 2. Token waste is small and bounded
+
+The codebase has roughly 5 `workflow.*` toggle references in agent files and
+~20 "Skip if" conditional-prose patterns total — most 1–2 sentences. The
+"real spend across multi-phase milestones" claim was not measured against
+`gsd-context-monitor` output despite being asked. Without a measured baseline,
+the token-savings argument is asserted rather than demonstrated, and the savings
+ceiling on ~20 short conditionals is small enough that it does not justify a new
+template-and-rendering subsystem with a CI-enforced template/generated split.
+
+### 3. The deterministic-gating need is already served
+
+PR #2279 established orchestrator-time config embedding for the cases that
+genuinely need deterministic resolution (model selection, reasoning effort,
+worktree mode). That mechanism is the right layer for orchestration-time
+decisions and can be extended toggle-by-toggle along the existing path without
+introducing a parallel templating subsystem. The proposal's own "Alternative #1"
+(continue the orchestrator-embedding pattern) was rejected on the grounds that
+agent-internal conditionals belong in the agent layer, but the asks behind the
+proposal — determinism, lower token cost — are equally satisfied by extending
+PR #2279 incrementally without a second mechanism.
+
+Adding a templating layer alongside orchestrator-embedding means two mechanisms
+own the same problem. The proposal does not specify a partition rule, and the
+reporter did not respond when asked for one.
+
+### 4. Patch-migration risk is disproportionate to benefit
+
+The `/gsd-reapply-patches` three-way-merge migration for `gsd-local-patches/`
+is, in the proposal's own words, the highest-risk piece of the change. It exists
+solely to absorb a contributor-workflow shift — the user-facing surface is
+unchanged. Risk that flows entirely from internal restructuring, where the
+benefit is unmeasured token savings and a theoretical determinism gain, is the
+wrong trade.
+
+The reduced-scope variant (Alternative #5: fresh installs only, defer the
+migration) avoids that specific risk but still ships a parallel mechanism for
+benefits that remain unmeasured and that PR #2279's path can absorb.
+
+## Re-open criteria
+
+This may be revisited if a contributor:
+
+- Provides measured token deltas via `gsd-context-monitor` against a
+  representative all-toggles-off config, and the delta is materially larger
+  than what extending PR #2279's orchestrator-embedding path one toggle at a
+  time would produce.
+- Documents a real LLM misinterpretation of an existing toggle conditional
+  (executor ignored `workflow.use_worktrees: false`, verifier ran when
+  `workflow.verifier: false`, etc.) — not a projected failure mode.
+- Proposes a clear partition rule between orchestrator-time embedding (PR #2279)
+  and any new install-time templating layer, so the two mechanisms do not
+  overlap.
+
+## Related
+
+- PR #2279 — Codex/OpenCode model embedding at install time (the established
+  precedent for deterministic compile-time embedding into agent files)
+- v1.37.0 release notes — shared-boilerplate extraction (reference files for
+  mandatory-initial-read, project-skills-discovery)
+- `get-shit-done/workflows/` — workflow-level config embedding before subagent
+  spawn (the path of least friction for incremental deterministic gating)