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gbrain write surfaces — what lands where, and how to verify

This doc serves two audiences:

Agents: when a planning skill renders the compact ## Brain Context Load or ## Save Results to Brain blocks, those blocks reference this doc. Read §Context Load or §Save Template here on-demand when you're actually using gbrain. Skip entirely if gbrain is not on PATH.
Humans: after running a planning skill against a real brain, use the manual-probe sections to confirm the page actually landed.

What lands where

Host + detection state	What renders in the planning-skill SKILL.md
Any host + `gstack-config gbrain-refresh` reports `gbrain_local_status: "ok"`	Compressed brain-aware blocks render. Agent reads this doc on-demand when it actually saves. ~250 token overhead per planning skill.
Any host + gbrain not detected	Blocks suppressed at gen-time. Zero token overhead. Calibration takes still render (separate resolver, host-agnostic).
GBrain or Hermes host	Blocks always render regardless of detection — these hosts ship gbrain integration as a first-class concern.

.gbrain-source pins reads only — writes go to the default engine configured in ~/.gbrain/config.json. Documented at bin/gstack-gbrain-sync.ts for code-lookup resolvers; gstack treats the same contract as load-bearing for artifact put semantics. If a user reports writes landing in the wrong source, look here first.

Trust policy (personal vs shared, per endpoint hash) gates auto-push and writeback. Set via gstack-config set brain_trust_policy@<endpoint-hash> personal. Local PGLite installs auto-default to personal; remote-MCP installs prompt during /setup-gbrain step 9.5.

§Context Load (agent reads this when running a planning skill)

Before starting, search the brain for relevant context:

Extract 2-4 keywords from the user's request. Pick nouns, error names, file paths, technical terms — NOT verbs or adjectives. Example: for "the login page is broken after deploy", search for login broken deploy.
Search: gbrain search "<keyword1 keyword2>". Returns lines like [slug] Title (score: 0.85) - first line of content....
If few results (under 3): broaden to the single most specific keyword and search again. If still few, proceed without brain context.
Read top 3 results: gbrain get_page "<slug>" for each. Stop after 3 — diminishing returns past that.
Use the context to inform your analysis. Cite specific slugs in your output when a brain page changed your thinking.

If gbrain search returns any non-zero exit (gbrain not on PATH, network flake, throttle), treat as transient: proceed without brain context. Do not retry inline — the user can re-run the skill later.

§Save Template (agent reads this when actually saving)

After completing the skill, save the output. The compact resolver block already shows the slug prefix + title + tag for your specific skill (e.g. gbrain put "ceo-plans/<feature-slug>" ...). The full template:

gbrain put "<slug-prefix>/<feature-slug>" --content "$(cat <<'EOF'
---
title: "<Title>: <feature name>"
tags: [<tag>, <feature-slug>]
---
<skill output in markdown — the actual deliverable, not a summary>
EOF
)"

Slug guidance: <feature-slug> should be kebab-case, lowercase, and unique within the prefix. Prefer concrete project/feature names over abstract labels. Example: auth-rate-limit not security-fix.

Title guidance: the constant prefix (e.g. "CEO Plan", "Eng Review") is fixed; the suffix is the human-readable name of the feature/topic.

Tag guidance: the first tag is the constant <tag> from the skill's metadata (e.g. ceo-plan, eng-review). The second tag is the <feature-slug> so cross-page traversal works. Add more tags if obvious relationships exist (e.g. [ceo-plan, auth-rate-limit, security]).

Entity-stub enrichment

After saving the main page, extract person and organization names mentioned in the output. For each one:

# Check if a page exists first
gbrain search "<entity name>"

# If no match, create a stub
gbrain put "entities/<entity-slug>" --content "$(cat <<'EOF'
---
title: "<Person or Company Name>"
tags: [entity, person]
---
Stub page. Mentioned in <skill name> output. Replace with real bio when relevant.
EOF
)"

Only extract real names — actual person names (e.g. "Garry Tan") and company/organization names (e.g. "Y Combinator"). Skip product names, feature names, section headings, technical terms (CSS class names, function names), and file paths. When in doubt, skip.

tags: [entity, person] for people, tags: [entity, organization] for companies/teams.

Error handling

Throttle: exit code 1 with stderr containing throttle, rate limit, capacity, or busy. Defer the save and move on — the brain is busy; the content isn't lost, just not persisted this run.
Any other non-zero exit: treat as transient failure. Do not retry inline — the user can re-run the skill or run gstack-config gbrain-refresh if they suspect gbrain itself is misconfigured.
gbrain: command not found: gbrain isn't on PATH. The compact resolver block told you to skip — you shouldn't reach this code. If you somehow did, silently skip and continue.

Backlinks

If your save output mentions another brain page by name or topic, add a backlink line at the bottom of the markdown body:

Related: [[other-page-slug]], [[another-slug]]

gbrain auto-resolves [[slug]] syntax into a clickable link in the rendered page. Add backlinks only when the relationship is concrete (e.g. "this CEO plan depends on the eng review at eng-reviews/auth-rate-limit"). Don't fabricate connections.

Completion summary

In your final skill output, note brain utilization in one line: "Brain: read 3 pages, saved 1 page, enriched 2 entity stubs, 0 throttles." This helps the user see brain coverage growing over time.

Persistence verification (automated)

The matched-pair "is the data we hope to save actually being saved?" question is covered by test/skill-e2e-gbrain-roundtrip-local.test.ts: real gbrain init --pglite + gbrain put + gbrain get round-trip against an isolated temp HOME. Periodic-tier. Skips when VOYAGE_API_KEY is unset or gbrain CLI is missing from PATH.

Run it before opening a PR that touches the resolver:

EVALS=1 EVALS_TIER=periodic VOYAGE_API_KEY=$VOYAGE_API_KEY \
  bun test test/skill-e2e-gbrain-roundtrip-local.test.ts

If you do want to spot-check by hand against your own brain after a real planning-skill run (debugging a specific page that the agent should have saved):

gbrain get "<prefix>/<slug>"           # expect markdown + frontmatter
gbrain search "<slug fragment>"        # expect slug in top results
gbrain sources list                    # confirm gstack-brain-<user> source
gbrain get "entities/<person>"         # expect stub per named person

Remote / Supabase / thin-client-MCP routing

The resolver emits a single CLI shape — gbrain put "<slug>" --content "..." — that works against every engine gbrain supports. The CLI internally routes to local PGLite, remote Supabase, or a remote MCP endpoint depending on the user's ~/.gbrain/config.json. gstack doesn't test that routing: the storage layer is gbrain's contract to honor, and the same CLI invocation we test against local PGLite is the one that fires against any other engine.

If you're on Supabase or thin-client MCP and writes aren't landing:

gbrain doctor --fast --json — engine health check. If anything reports error, fix that first.
gstack-config get brain_trust_policy@<endpoint-hash> must be personal for auto-write. Run gstack-config endpoint-hash to get the active hash. If shared, the agent prompts before writes — if you declined, re-run the skill.
If trust policy is personal and gbrain doctor is clean but the page still isn't there, file an issue against gbrain — gstack's CLI call shape is the same as what T11 (gbrain-roundtrip-local) exercises.

What's NOT verified by automation

Calibration takes (takes_add): today these fall back to fence-block writes inside a gbrain put because BRAIN_CALIBRATION_WRITEBACK is FALSE pending gbrain v0.42+ shipping the takes_add MCP op. When the flag flips, re-run the probe in this doc against /office-hours and confirm gbrain takes_list surfaces a kind=bet entry with the expected weight (0.9 for office-hours, per scripts/brain-cache-spec.ts:151-157).
Per-skill E2E for the other 4 planning skills: only /office-hours has fake-CLI E2E coverage (test/skill-e2e-office-hours-brain-writeback.test.ts). The resolver unit test (test/resolvers-gbrain-save-results.test.ts) covers wiring for all 5. Per-skill E2E expansion is tracked in TODOS.md.
.gbrain-source write semantics: gstack treats the documented reads-only contract as load-bearing, but doesn't independently verify that gbrain CLI never re-routes writes based on the pin. If you find a case where it does, that's a gbrain bug to file upstream.

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