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fix(#1116): use deployment-agnostic model aliases in review sub-agents - #1181

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@fullsend-ai-coder fullsend-ai-coder Bot commented Sep 4, 2026

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Summary

  • Replace pinned model: claude-sonnet-4-6@default with model: sonnet in the 5 review sub-agent personas that carried it (cross-repo-contracts, docs-currency, intent-coherence, risk-assessment, style-conventions). Personas name an alias, never a generation; the runtime resolves it (fullsend piModelAliases on pi, the Claude Code CLI on Claude). Unpinned, the CLI's Vertex default for sonnet is claude-sonnet-4-5@20250929, which the fleet projects do not serve — that is the dispatch failure and opus fallback seen in Review sub-agent model config should use deployment-agnostic aliases to prevent dispatch failures #1116, Review orchestrator passes roster-table model alias instead of frontmatter model to sub-agents #256 and fullsend#6666.
  • Add ANTHROPIC_DEFAULT_SONNET_MODEL=claude-sonnet-4-6 to env/gcp-vertex.env as the fleet-wide base pin for the sonnet alias on the Claude Code runtime. Every harness in this repo mounts the file, so this applies to all agents, not review only (a BYO consumer that copied the file rather than referencing it does not receive the pin). A pinned alias has no CLI startup fallback: a consumer whose Vertex project does not serve claude-sonnet-4-6 overrides it from a harness that composes this one (base: or an overlays: entry) and sets env.sandbox.ANTHROPIC_DEFAULT_SONNET_MODELenv.sandbox is exported after .env.d is sourced (ADR 0055); fullsend's env.sandbox/host_files lint warning on that key is the intended collision. With opus unpinned, a run that reaches the CLI with no --model defaults to this sonnet id; every harness here sets model:, so only a consumer harness that omits it is affected. The comment block in the file records this, the cross-reference to fullsend's pi alias table (bumped together, fullsend#7028 / fullsend#7031), and why opus stays unpinned.
  • Add explicit tools: Read, Grep, Glob, permissionMode: dontAsk, background: false to security-triage.md. Inert today (it is dispatched as subagent_type: Explore); prepares the persona for dispatch by name in fullsend#7031.

Context

Observed in fullsend PR #6010 review run — 4 of 7 review sub-agents failed initial dispatch because the pinned claude-sonnet-4-6@default string fell through to the CLI's Vertex default (claude-sonnet-4-5@20250929), which the fleet project does not serve; the bare sonnet alias lands on the same id without the pin added here. The review agent recovered by re-dispatching without model overrides, so all 7 sub-agents ran on opus instead of the intended 3 opus + 4 sonnet split.

Testing

  • The 6 persona files pass skillsaw (make lint); env/gcp-vertex.env is outside skillsaw's scope and was verified by sourcing in the A/B runs below.
  • Functional test evidence, eval-results-review artifact of run 33931136204 (commit bf7c925, which differs from head only by the inert background: true → false and the comment/docs commits that carry no runtime change): the orchestrator dispatched model: sonnet for risk-assessment, style-conventions, intent-coherence and docs-currency and model: opus for correctness, security and challenger; every sonnet child ran on claude-sonnet-4-6 (claude-sonnet-4-6:streamRawPredict in the fleet region) with zero dispatch errors; all judges at pass_rate 1.0. That sandbox ran Claude Code 2.1.258 (the current release image; fullsend main pins 2.1.260).
  • Local A/B on the Claude Code runtime (fleet review harness at this branch, image fullsend-code@sha256:ea2a31f3… = Claude Code 2.1.258, Vertex dev project, --no-post-script, nothing posted): with the env line every sonnet child ran claude-sonnet-4-6 (risk-assessment, intent-coherence, style-conventions, docs-currency) and every opus child claude-opus-4-6; without it the same sonnet children ran claude-sonnet-4-5-20250929. The env line is load-bearing for sub-agents, not only the main model. In both runs the orchestrator passed an explicit model argument on 13 of 13 dispatches, transcribed from the persona frontmatter (SKILL.md steps 4 and 6d do not instruct it to), so the rename is honoured by the LLM rather than enforced by the harness — deterministic enforcement is fullsend#7031.
  • ANTHROPIC_DEFAULT_SONNET_MODEL governs the sonnet alias for sub-agents as well as the main model (Claude Code model-config docs; single resolver in the CLI), and the env file reaches the CLI process via host_files/sandbox/workspace/.env.d/gcp-vertex.env → sourced by .env before claude launches. Note: fullsend's docs/contributing/runtime-implementation.md currently states the opposite for Vertex ("ANTHROPIC_DEFAULT_*_MODEL does not steer the request there"); the A/B above contradicts it; follow-up filed as docs: runtime-implementation.md says ANTHROPIC_DEFAULT_*_MODEL does not steer aliases on Vertex — it does (verified A/B on 2.1.258) fullsend#7039.
  • The earlier red functional-tests-complete on this head was a label-event self-cancel of the in-flight review job (the review bot's requires-manual-review label started a second run in the same concurrency group); the rerun of the same run is green.

Closes #1116

Post-script verification

  • Branch is not main/master (agent/1116-depin-subagent-model-aliases)
  • Secret scan passed

Replace pinned claude-sonnet-4-6@default model strings with the
sonnet alias in 5 review sub-agent personas (cross-repo-contracts,
docs-currency, intent-coherence, risk-assessment, style-conventions).
The pinned version resolved to claude-sonnet-4-5@20250929, which
is unavailable on the Vertex deployment, causing dispatch failures
and fallback to the parent opus model.

Add ANTHROPIC_DEFAULT_SONNET_MODEL=claude-sonnet-4-6 to
env/gcp-vertex.env so the Claude Code runtime resolves the
sonnet alias to the model version served by the fleet Vertex
projects.

Add explicit tools: Read, Grep, Glob to security-triage.md so
the persona carries its own read-only tool declaration, preparing
for the dispatch-by-persona-name change in fullsend#7031.

Note: pre-commit hooks were not fully run. pre-commit could not
complete (network restriction in sandbox). Hooks were run directly
where possible (trailing whitespace, EOF newline, merge conflict,
secret scan). skillsaw lint passed.

Closes #1116
@fullsend-ai-coder
fullsend-ai-coder Bot requested a review from a team as a code owner September 4, 2026 23:06
@fullsend-ai-coder fullsend-ai-coder Bot added the ready-for-review Triggers review agent dispatch label Sep 4, 2026
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fullsend-ai-review Bot commented Sep 4, 2026

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🤖 Finished Review · ✅ Success · Started 11:08 PM UTC · Completed 11:21 PM UTC

Commit: ca02794 · View workflow run →

Runtime: claude · Model: opus → claude-opus-4-6 · Effort: high · Cost: $2.60

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fullsend-ai-review Bot commented Sep 4, 2026

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Review

Findings

Medium

  • [protected-path] skills/pr-review/sub-agents/ — This PR modifies 6 files under the skills/ protected path: cross-repo-contracts.md, docs-currency.md, intent-coherence.md, risk-assessment.md, security-triage.md, style-conventions.md. The PR links to issue Review sub-agent model config should use deployment-agnostic aliases to prevent dispatch failures #1116 and explains the rationale (deployment-agnostic model aliases to prevent Vertex dispatch failures). Human approval is always required for protected-path changes, regardless of context.
Previous run

Review

Findings

Medium

  • [protected-path] skills/pr-review/sub-agents/ — This PR modifies 6 files under the skills/ protected path: cross-repo-contracts.md, docs-currency.md, intent-coherence.md, risk-assessment.md, security-triage.md, style-conventions.md. The PR links to issue Review sub-agent model config should use deployment-agnostic aliases to prevent dispatch failures #1116 and explains the rationale (deployment-agnostic model aliases to prevent Vertex dispatch failures). Human approval is always required for protected-path changes, regardless of context.

Low

Previous run (2)

Review

Findings

Medium

  • [protected-path] skills/pr-review/sub-agents/ — This PR modifies 6 files under the skills/ protected path: cross-repo-contracts.md, docs-currency.md, intent-coherence.md, risk-assessment.md, security-triage.md, style-conventions.md. The PR links to issue Review sub-agent model config should use deployment-agnostic aliases to prevent dispatch failures #1116 and explains the rationale (deployment-agnostic model aliases to prevent Vertex dispatch failures). Human approval is always required for protected-path changes, regardless of context.
Previous run (3)

Review

Findings

Medium

  • [frontmatter-dispatch-contradiction] skills/pr-review/sub-agents/security-triage.md:7 — The PR adds background: true to security-triage's frontmatter, but the pr-review SKILL.md explicitly requires this agent to run synchronously because its classification output feeds into step 3d's context package assembly. The other synchronous pre-pass agent, risk-assessment, correctly uses background: false. If the orchestrator reads the frontmatter background field to determine run_in_background, security-triage would be dispatched asynchronously, triggering the fallback that treats all files as security-critical — a safe degradation but incorrect behavior that defeats the purpose of the triage classifier.
    Remediation: Change background: true to background: false in security-triage.md's frontmatter, matching risk-assessment.md's pattern for synchronous pre-pass agents.

  • [protected-path] skills/pr-review/sub-agents/ — This PR modifies 6 files under the skills/ protected path: cross-repo-contracts.md, docs-currency.md, intent-coherence.md, risk-assessment.md, security-triage.md, style-conventions.md. The PR links to issue Review sub-agent model config should use deployment-agnostic aliases to prevent dispatch failures #1116 and explains the rationale (deployment-agnostic model aliases to prevent Vertex dispatch failures). Human approval is always required for protected-path changes, regardless of context.


Next steps:

  • /fs-fix — agent addresses review findings automatically
  • /fs-fix <your instruction> — agent fixes with your specific guidance
  • Push commits directly — review re-runs automatically on push
  • /fs-fix-stop — disable automatic fix runs for this PR
Previous run (4)

Review

Findings

Medium

  • [protected-path] skills/pr-review/sub-agents/ — This PR modifies 6 files under the skills/ protected path: cross-repo-contracts.md, docs-currency.md, intent-coherence.md, risk-assessment.md, security-triage.md, style-conventions.md. The PR links to issue Review sub-agent model config should use deployment-agnostic aliases to prevent dispatch failures #1116 and explains the rationale (deployment-agnostic model aliases to prevent Vertex dispatch failures). Human approval is always required for protected-path changes, regardless of context.

Low

  • [frontmatter consistency] skills/pr-review/sub-agents/security-triage.md:5 — All other sub-agent definitions in this directory include a background field in their frontmatter (e.g., background: true for cross-repo-contracts, docs-currency, intent-coherence, style-conventions; background: false for risk-assessment). security-triage.md omits it, breaking the uniform shape of sub-agent frontmatter blocks. Note: this is a pre-existing condition not introduced by this PR — the diff only adds tools and permissionMode lines.
    Remediation: Add background: true (or false, depending on desired dispatch behavior) to the security-triage.md frontmatter to match sibling definitions.

Labels: PR modifies review agent sub-agent configurations exclusively


Next steps:

  • /fs-fix — agent addresses review findings automatically
  • /fs-fix <your instruction> — agent fixes with your specific guidance
  • Push commits directly — review re-runs automatically on push
  • /fs-fix-stop — disable automatic fix runs for this PR
Previous run (5)

Review

Findings

Medium

  • [runtime mechanism gap] skills/pr-review/sub-agents/security-triage.md:4 — This PR adds tools: Read, Grep, Glob to security-triage but does not add permissionMode: dontAsk. All 8 other sub-agents that declare tools also declare permissionMode: dontAsk. Without it, the newly-added tools may trigger interactive permission prompts, which would stall or fail in the automated/background review pipeline.
    Remediation: Add permissionMode: dontAsk to the security-triage frontmatter, consistent with every other tool-bearing sub-agent.

  • [protected-path] skills/pr-review/sub-agents/ — This PR modifies 6 files under the skills/ protected path: cross-repo-contracts.md, docs-currency.md, intent-coherence.md, risk-assessment.md, security-triage.md, style-conventions.md. The PR links to issue Review sub-agent model config should use deployment-agnostic aliases to prevent dispatch failures #1116 and explains the rationale (deployment-agnostic model aliases to prevent Vertex dispatch failures). Human approval is always required for protected-path changes, regardless of context.


Next steps:

  • /fs-fix — agent addresses review findings automatically
  • /fs-fix <your instruction> — agent fixes with your specific guidance
  • Push commits directly — review re-runs automatically on push
  • /fs-fix-stop — disable automatic fix runs for this PR

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fullsend-ai-coder Bot commented Sep 4, 2026

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🤖 Finished Fix · ✅ Success · Started 11:23 PM UTC · Completed 11:28 PM UTC

Commit: ca02794 · View workflow run →

Runtime: claude · Model: opus → claude-opus-4-6 · Effort: high · Cost: $1.20

Add `permissionMode: dontAsk` to security-triage.md frontmatter,
consistent with all other tool-bearing sub-agents. Without it, the
newly-added tools could trigger interactive permission prompts that
stall the automated review pipeline.

Note: pre-commit hooks were not run. `pre-commit` could not complete
(infrastructure failure — sandbox network blocks git fetch to remote
hook repos). YAML validation and trailing-whitespace checks were run
directly. skillsaw lint passed (Grade A, 0 errors).

Addresses #1181
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🔧 Fix agent — iteration 1 (bot-triggered)

Added permissionMode: dontAsk to security-triage.md frontmatter to prevent interactive permission prompts in the automated review pipeline. The protected-path finding is a governance note requiring human approval, not a code fix.

Fixed (1):

  1. runtime mechanism gap: security-triage missing permissionMode: dontAsk (skills/pr-review/sub-agents/security-triage.md): Added permissionMode: dontAsk to security-triage frontmatter, consistent with all 8 other tool-bearing sub-agents. Without it, the tools added by this PR would trigger interactive permission prompts in the automated review pipeline.

Disagreed (1):

  1. protected-path: PR modifies files under skills/ protected path: This is a process observation, not a code defect. The PR body already explains the rationale (deployment-agnostic model aliases to prevent Vertex dispatch failures). Human approval for protected-path changes is a governance requirement handled outside the fix agent's scope.

Tests: passed

Decision points
  • Whether to add background: true to security-triage alongside permissionMode (alternatives: Add background: true for full consistency with other sub-agents, Only add what the review requested; rationale: The review only flagged permissionMode: dontAsk. Adding background would exceed the review scope. The security-triage agent may intentionally omit background for orchestration reasons.)

Next steps:

  • /fs-review — request a re-review of the changes
  • /fs-fix <your instruction> — run another fix pass with specific guidance
  • Push commits directly — review re-runs automatically on push
    Updated by fullsend fix agent

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🤖 Finished Review · ✅ Success · Started 11:30 PM UTC · Completed 11:44 PM UTC

Commit: a7b4ef1 · View workflow run →

Runtime: claude · Model: opus → claude-opus-4-6 · Effort: high · Cost: $2.69

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🤖 Finished Fix · ✅ Success · Started 11:46 PM UTC · Completed 11:53 PM UTC

Commit: a7b4ef1 · View workflow run →

Runtime: claude · Model: opus → claude-opus-4-6 · Effort: high · Cost: $1.05

Add `background: true` to security-triage.md frontmatter for
consistency with all other sub-agent definitions in the directory.

Note: pre-commit hooks were not run. `pre-commit` could not complete
(infrastructure failure — sandbox cannot fetch remote hook repos),
and the direct-execution fallback was used for basic checks only.
Lint (`make lint`) could not run due to missing `uvx` in sandbox.

Addresses #1181
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🔧 Fix agent — iteration 2 (bot-triggered)

Added background: true to security-triage.md frontmatter for consistency with all other sub-agent definitions. The protected-path finding is a governance note requiring human approval, not a code fix.

Fixed (1):

  1. frontmatter consistency: security-triage.md missing background field (skills/pr-review/sub-agents/security-triage.md): Added background: true to security-triage.md frontmatter to match the uniform shape of all other sub-agent definitions in the directory (cross-repo-contracts, docs-currency, intent-coherence, style-conventions use background: true; risk-assessment uses background: false). security-triage is a lightweight classifier suitable for background dispatch.

Disagreed (1):

  1. protected-path: PR modifies files under skills/ protected path: This is a governance observation, not a code defect. The PR body explains the rationale (deployment-agnostic model aliases to prevent Vertex dispatch failures). Human approval for protected-path changes is a governance requirement handled outside the fix agent's scope.

Tests: passed

Decision points
  • Whether to set background: true or false for security-triage (alternatives: background: true (consistent with other lightweight/non-blocking sub-agents), background: false (like risk-assessment, which runs synchronously); rationale: security-triage is described as a lightweight classifier for fast file classification. It does not produce review findings or run scripts that need synchronous orchestration. background: true matches the dispatch pattern of similar lightweight sub-agents (docs-currency, style-conventions, cross-repo-contracts, intent-coherence).)

Next steps:

  • /fs-review — request a re-review of the changes
  • /fs-fix <your instruction> — run another fix pass with specific guidance
  • Push commits directly — review re-runs automatically on push
    Updated by fullsend fix agent

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🤖 Finished Review · ✅ Success · Started 11:55 PM UTC · Completed 12:11 AM UTC

Commit: bf7c925 · View workflow run →

Runtime: claude · Model: opus → claude-opus-4-6 · Effort: high · Cost: $2.96

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🤖 Finished Fix · ✅ Success · Started 12:12 AM UTC · Completed 12:20 AM UTC

Commit: bf7c925 · View workflow run →

Runtime: claude · Model: opus → claude-opus-4-6 · Effort: high · Cost: $1.44

Change background to false in security-triage.md frontmatter to match
the pr-review SKILL.md requirement (step 3c-1) that this agent runs
synchronously. Its classification output feeds into step 3d context
package assembly. Matches risk-assessment.md pattern for pre-pass agents.

Addresses #1181
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🔧 Fix agent — iteration 3 (bot-triggered)

Fixed frontmatter-dispatch-contradiction by changing background: true to background: false in security-triage.md, matching the SKILL.md requirement for synchronous pre-pass agents. Protected-path finding acknowledged as requiring human approval (not a code fix).

Fixed (1):

  1. frontmatter-dispatch-contradiction (skills/pr-review/sub-agents/security-triage.md): Changed background: true to background: false. The pr-review SKILL.md (step 3c-1, line 452) explicitly requires security-triage to run synchronously because its classification output feeds into step 3d context package assembly. This matches risk-assessment.md which also uses background: false as a synchronous pre-pass agent.

Disagreed (1):

  1. protected-path: This is an informational finding noting that files under skills/ are protected paths requiring human approval. This is a process requirement fulfilled by a human reviewer approving the PR, not a code change the fix agent can address. The PR already documents the rationale (issue Review sub-agent model config should use deployment-agnostic aliases to prevent dispatch failures #1116) for modifying these files.

Tests: passed

Strategy change: Previous iterations added background: true based on the majority sub-agent pattern. This iteration verified the SKILL.md orchestration requirement (step 3c-1) which classifies security-triage as a synchronous pre-pass agent alongside risk-assessment, requiring background: false.

Decision points
  • Corrected background field value from true to false (alternatives: Keep background: true (previous fix iteration's choice), Set background: false (matching SKILL.md and risk-assessment.md); rationale: SKILL.md step 3c-1 line 452 explicitly states security-triage runs synchronously. The previous iteration incorrectly set background: true based on the majority pattern of other sub-agents, but security-triage is a pre-pass agent like risk-assessment, not a parallel review agent.)

Next steps:

  • /fs-review — request a re-review of the changes
  • /fs-fix <your instruction> — run another fix pass with specific guidance
  • Push commits directly — review re-runs automatically on push
    Updated by fullsend fix agent

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🤖 Finished Review · ✅ Success · Started 12:21 AM UTC · Completed 12:33 AM UTC

Commit: 2aeb902 · View workflow run →

Runtime: claude · Model: opus → claude-opus-4-6 · Effort: high · Cost: $2.54

@fullsend-ai-review
fullsend-ai-review Bot dismissed stale reviews from themself September 5, 2026 00:33

Superseded by updated review

@fullsend-ai-review fullsend-ai-review Bot added the requires-manual-review Review requires human judgment label Sep 5, 2026
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🤖 Finished Review · ✅ Success · Started 2:22 AM UTC · Completed 2:39 AM UTC

Commit: 13da44f · View workflow run →

Runtime: claude · Model: opus → claude-opus-4-6 · Effort: high · Cost: $3.07

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🤖 Review · ⚠️ Cancelled · Started 2:42 AM UTC · Ended 2:58 AM UTC

Commit: 3102398 · View workflow run →

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/fs-fix-stop

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Fix agent disabled for this PR. Remove the fullsend-no-fix label or use /fs-fix to re-engage.

@github-actions github-actions Bot added the fullsend-no-fix Skip bot-triggered fix agent runs label Sep 5, 2026
The env file is mounted by every harness here, so the sonnet pin applies to
all agents and, being a pin, has no CLI fallback. Say so next to the export in
eleven lines: what it fixes, how a consumer whose Vertex project lacks the id
overrides it (env.sandbox from a composing harness, exported after .env.d),
that it is bumped together with fullsend's pi alias table, and why opus and
haiku stay unpinned. Add the variable to the review Variables table so the
override is documented where the other env.sandbox overrides are.

Assisted-by: Claude (fix), Claude (review), Codex gpt-5.6-sol (review), Grok 4.6 (review)
Signed-off-by: Wayne Sun <gsun@redhat.com>
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waynesun09 force-pushed the agent/1116-depin-subagent-model-aliases branch from 3102398 to e3cdf14 Compare September 5, 2026 02:58
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🤖 Finished Review · ✅ Success · Started 3:00 AM UTC · Completed 3:15 AM UTC

Commit: e3cdf14 · View workflow run →

Runtime: claude · Model: opus → claude-opus-4-6 · Effort: high · Cost: $2.73

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Approved after takeover: A/B-verified sonnet pin on the fleet image, three squad review rounds (Claude, Codex, Grok), all threads resolved, CI green on e3cdf14.

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waynesun09 added this pull request to the merge queue Sep 5, 2026
Merged via the queue into main with commit 6100cc4 Sep 5, 2026
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waynesun09 deleted the agent/1116-depin-subagent-model-aliases branch September 5, 2026 13:10
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🤖 Finished Retro · ✅ Success · Started 1:12 PM UTC · Completed 1:27 PM UTC

Commit: e3cdf14 · View workflow run →

Runtime: claude · Model: opus → claude-opus-4-6 · Effort: high · Cost: $2.90

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Retro: PR #1181 — deployment-agnostic model aliases in review sub-agents

Timeline

Issue #1116 was filed by the retro agent after observing model dispatch failures in a review run on fullsend-ai/fullsend. Four of seven review sub-agents failed because claude-sonnet-4-6@default resolved to a model version unavailable on the fleet's Vertex project.

Human issued /fs-code with well-scoped instructions (de-pin 5 model strings, add tools to security-triage.md, add env var). The code agent executed correctly in $1.59 but omitted permissionMode: dontAsk and background from security-triage.md when adding tools:.

This triggered a 3-iteration fix loop across 6 review cycles:

Human then took over (/fs-fix-stop), pushed documentation updates, obtained three external squad reviews (Claude, Codex, Grok), and approved.

Total cost: ~$21.87 (code $1.59, fix $3.69, review $16.59 across 6 completed reviews). If the code agent had added all three frontmatter fields correctly, estimated cost would have been ~$4.19.

Review Quality

Excellent. All three review findings were legitimate, actionable, and confirmed by the human:

  1. Missing permissionMode — real runtime stall risk in automated pipelines
  2. Missing background — frontmatter consistency gap (pre-existing, correctly flagged at low severity)
  3. Wrong background value — semantic error contradicting SKILL.md dispatch requirements

The review agent demonstrated strong cross-file reasoning by checking SKILL.md dispatch logic against the persona frontmatter.

Existing Issue Evidence

  • #1154 ("Review agent re-review should suppress findings the fix agent previously disagreed with"): The protected-path governance finding was re-flagged across all 6 review cycles despite the fix agent correctly disagreeing each time. This PR provides additional evidence for that issue.
  • #801 ("Style-conventions sub-agent should cross-reference peer skill files for structural pattern consistency"): Related to frontmatter consistency checking but scoped to the review sub-agent, not the code agent. The proposals below address the code and fix agent sides of the same gap.

Proposals filed

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Review sub-agent model config should use deployment-agnostic aliases to prevent dispatch failures

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