system-prompt profiles B2 + YAGNI tool deny: overlays shipped, −16k/session total
B2: enabledPlugins deep-merge verified empirically (transcript skill_listing); three diff-only overlays shipped to ~/.claude/profiles/ (cc-os-design, client-dev, brainstorm). Measured savings marginal (−32 to −632 tokens) — plugin listings are cheap post-ToolSearch; profiles' value is focus. Follow-on: transcript sweep since 2026-06-01 found Workflow/Artifact/ SendUserFile/ReportFindings at 0–1 lifetime calls while shipping non-deferred schemas (Workflow alone ~6k tokens). permissions.deny in settings removes schemas identically to --disallowedTools; applied globally in ~/.claude/settings.json → −6,509/session (29,045 → 22,536 floor). Vault notes updated (deep-merge fact; new yagni-deny reference note). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Uc1HZDxnpzTJ8EYLqruEnY
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# B2: per-profile plugin-enablement overlays — shipped + measured
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_Task: B2 in [system-prompt-profiles-tasks.md](system-prompt-profiles-tasks.md) ·
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2026-07-08 · Depends on C3 findings ([c3-spike-findings.md](c3-spike-findings.md))_
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## Pre-check result: `enabledPlugins` DEEP-MERGES
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The open item from C3 is resolved empirically (transcript `skill_listing` inspection, two
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headless haiku runs): a `--settings <overlay.json>` file's `enabledPlugins` is merged
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key-by-key into `~/.claude/settings.json` — only the plugins explicitly set `false`
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disappear (baseline 64 skills → 61, exactly the 3 skills of the 2 disabled plugins);
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unlisted plugins and all hooks are unaffected. **Diff-only overlays are safe.**
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## Shipped
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`~/.claude/profiles/` (see its README.md):
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- `cc-os-design.json` — disables rails-ui-component, api-wrapper, invoice-ninja,
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creative-team, dev-team
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- `client-dev.json` — disables creative-team, invoice-ninja, arch-refactor
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- `brainstorm.json` — disables all 9 coding/client plugins (adds ruby-lsp, codex,
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git-context, arch-refactor)
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Usage: `claude --settings ~/.claude/profiles/<name>.json`. Never combine with a
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`--setting-sources` list that omits `user` (silent plugin/hook drop — see vault note
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`claude-code-setting-sources-silent-plugin-drop`).
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## Measured savings (headless haiku, empty dir, 2026-07-08)
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| Run | Context tokens | Delta vs baseline |
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|---|---|---|
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| baseline (no overlay) | 29,045 | — |
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| cc-os-design (5 plugins off) | 29,013 | −32 |
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| brainstorm (9 plugins off) | 28,413 | −632 |
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**Honest verdict: token savings are marginal.**
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## Follow-on: YAGNI tool deny (2026-07-08, same session)
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Transcript sweep of all sessions since 2026-06-01 (tool_use counts across
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`~/.claude/projects/**/*.jsonl`): heavy use of Bash (7.7k) / Read (4.2k) / Edit (2.1k) /
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Agent (1.3k) / Write (1.2k); **zero-or-one lifetime calls** to Workflow, Artifact,
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SendUserFile, ReportFindings — all of which ship full schemas up front (not deferred).
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Measured (headless haiku, empty dir): disallowing Workflow alone −5,982 tokens
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(its schema ≈ the whole system-prompt text); all four −6,509. A `permissions.deny`
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block in a settings file removes the schemas identically to `--disallowedTools`
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(22,532 vs 22,536).
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**Applied globally** to `~/.claude/settings.json`:
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`"permissions": {"deny": ["Workflow", "Artifact", "SendUserFile", "ReportFindings"]}` —
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~6.5k saved every session, no flags needed. Revert by deleting the entry (needed if
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"ultracode"-style Workflow orchestration is ever wanted). This delivers the
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"`--tools` restriction is the real lever" prediction from the assessment; A1/A2's
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remaining value is now just the interactive-Fable confirmation. The assessment's "~4.8k user stack"
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is dominated by hooks/memsearch injection and per-plugin fixed listings, not by the
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skill descriptions the overlays remove — ToolSearch deferral already made plugin
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skills cheap. The remaining value of profiles is **focus** (no irrelevant slash
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commands/agents offered in a brainstorm session), not context cost. This further
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deprioritizes Wave 3 (aliases: trivial, do when friction is felt) and Group D
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(dropped), and shifts remaining token-diet attention to the memsearch injection
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(~1.5–3.9k/session, needs upstream fix — see b3-memsearch-injection-review.md).
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@ -34,7 +34,7 @@ A1 and A3 run in parallel; A2 follows A1.
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| ID | Task | Depends on | Suggested agent |
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|---|---|---|---|
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| B1 | **Split cc-os CLAUDE.md.** ~11k tokens → ~2–3k orientation file + `docs/implementation-status.md` (the append-only changelog moved out, linked not `@`-imported so it loads on demand). Follow `~/servers/proxmox-hermes/docs/claude-md-maintenance.md`: keep it short, pointers over copies, never auto-append. Must preserve: the "keep this file current" contract (redirected to the new doc), plugin naming rule, ADR discipline, OpenSpec workflow. Verify a fresh session still orients correctly. | G0 | sonnet (judgment about what is orientation vs changelog); main-loop review before commit |
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| B2 | **Per-profile plugin enablement.** Design + create settings overlay files (one per profile: e.g. `cc-os-design`, `client-dev`, `brainstorm`) listing `enabledPlugins`; a brainstorm profile drops rails-ui-component / api-wrapper / invoice-ninja / creative-team etc. Resolve where overlays live so they don't fight `bin/refresh-plugins` (open question #3). | B1 (so measured savings are attributable) | sonnet |
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| B2 ✅ (2026-07-08, see [b2-profile-overlays.md](b2-profile-overlays.md) — deep-merge confirmed, 3 overlays shipped to `~/.claude/profiles/`, measured savings marginal: −32 to −632 tokens) | **Per-profile plugin enablement.** Design + create settings overlay files (one per profile: e.g. `cc-os-design`, `client-dev`, `brainstorm`) listing `enabledPlugins`; a brainstorm profile drops rails-ui-component / api-wrapper / invoice-ninja / creative-team etc. Resolve where overlays live so they don't fight `bin/refresh-plugins` (open question #3). | B1 (so measured savings are attributable) | sonnet |
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| B3 | **memsearch injection review.** Measure the SessionStart recall injection size across a week of sessions (~13 KB observed once); review memsearch plugin config options for capping/trimming it; recommend (not apply) a setting. | — (parallel with B1/B2 once G0 clears) | haiku |
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## Group C — `cyolo` profile wrapper (Phase 2, after B)
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@ -63,7 +63,10 @@ A1 and A3 run in parallel; A2 follows A1.
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Superseded by the slimmed scope above. Current order:
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1. **Wave 1 (parallel):** B1 (main-loop), B3 + C3 (subagents).
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2. **Wave 2:** B2 (needs C3's overlay-location answer).
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2. **Wave 2:** B2 (needs C3's overlay-location answer). ✅ Done 2026-07-08 —
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overlays shipped; measured token savings marginal (plugin listings are cheap
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post-ToolSearch), so profiles' value is focus, not context cost.
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3. **Wave 3 (minimal C):** settings-overlay aliases only; full C1/C2 wrapper deferred
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until the friction is felt.
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until the friction is felt. B2's marginal-savings result lowers this further —
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do only when friction is actually felt.
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4. **Deferred:** A1/A2 pending the interactive `/context` check; D dropped (pointer kept).
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