diff --git a/.claude/skills/sprint-start/SKILL.md b/.claude/skills/sprint-start/SKILL.md
index 29f501407..05da9aad8 100644
--- a/.claude/skills/sprint-start/SKILL.md
+++ b/.claude/skills/sprint-start/SKILL.md
@@ -365,11 +365,25 @@ using `TaskUpdate` with `addBlockedBy`.
 For each agent from the `**Agents:**` line, spawn a teammate in the
 background. Spawn all agents in parallel (one message, multiple Task calls):
 
+**Model pin (MANDATORY for team members):** every team-mode spawn —
+i.e. any `Task` with a `team_name` argument — must pass `model: "sonnet"`.
+Sprint 37 observed Opus 4.7 teammates ignoring scope rules, leaving
+tasks half-done, and failing to report back via SendMessage. Sonnet 4.6
+follows literal rules block discipline better. The **team lead**
+(this session, running `/sprint-start`) stays on whatever model the
+user has selected — typically Opus.
+
+**Inline (non-team) Agent spawns are exempt.** One-shot reviewers
+(`/pr-review`), research subagents, and other `Task` calls without a
+`team_name` keep their default model. The pin applies to the
+long-running team-coordination path specifically, not every Agent call.
+
 ```
 Task(
   subagent_type: "{name_lowercase}",
   team_name: "sprint-{N}-{team}",
   name: "{name_lowercase}",
+  model: "sonnet",
   prompt: "You are on the {team} team for Sprint {N}.
     Branch: `sprint-{N}/{team}`
 
diff --git a/.claude/skills/workshop-start/SKILL.md b/.claude/skills/workshop-start/SKILL.md
index bed632c1a..082f7c1b0 100644
--- a/.claude/skills/workshop-start/SKILL.md
+++ b/.claude/skills/workshop-start/SKILL.md
@@ -61,6 +61,7 @@ Use the Task tool to spawn each agent as a teammate. Each call should:
 - Set `team_name` to the workshop team name
 - Set `name` to the agent name (e.g., "gestalt")
 - Set `subagent_type` to the matching agent type (same as name — see reference table)
+- **Set `model: "sonnet"`** — team-mode participants pin to Sonnet 4.6 for literal-rule-following discipline. Opus 4.7 was observed ignoring scope rules and failing to report back in team mode (Sprint 37). The *team lead* (this session) stays on whatever model the user has selected.
 - Provide a prompt telling the agent to check TaskList for their assigned task
 
 Spawn all agents in parallel (one Task call per agent in a single message). Agents will appear as teammates in the Claude Code UI and pick up their tasks from the shared task list.