fix(agents): keep model routing keys out of block scalar descriptions by Rogercode97 · Pull Request #969 · Gentleman-Programming/gentle-shell

Rogercode97 · 2026-09-13T14:33:22Z

Summary

Resolves #956

updateFrontmatterRouting and its duplicate updateAgentFrontmatterRouting inserted model: and thinking: at descriptionIndex + 1. When an agent describes itself with a YAML block scalar:

description: >
  Adversarial review lens evaluating security risks.

that index lands inside the block scalar, ending the scalar prematurely and causing YAML parsers to treat description as an empty string while folding the description text into the model ID.

Changes

Consolidates frontmatter routing writers into a shared lib/agent-frontmatter.ts module.
Identifies block scalar headers (> / |) and appends routing keys after all continuation lines.
Replaces call sites in extensions/gentle-ai.ts and lib/sdd-preflight.ts.
Adds unit test suite tests/agent-frontmatter.test.ts (12 test cases) covering plain scalars, block scalars (folded, literal, chomped), idempotency, and agent body preservation.

Verification

node --experimental-strip-types --test tests/agent-frontmatter.test.ts (12/12 pass)
Verified with 19 agent files: clean YAML round-trip and preservation of descriptions.

Summary by CodeRabbit

Bug Fixes
- Improved agent configuration updates to reliably add or replace model and thinking settings without creating duplicate entries.
- Preserved multi-line descriptions and content outside the frontmatter block during configuration updates.
- Improved handling of agent definitions with missing, incomplete, or empty frontmatter.
Refactor
- Standardized frontmatter routing behavior across agent configuration and migration workflows.

updateFrontmatterRouting and its duplicate updateAgentFrontmatterRouting inserted model:/thinking: at descriptionIndex + 1. When an agent describes itself with a block scalar: description: > Adversarial review lens evaluating security risks. that index is inside the scalar, so the block ended early. The description parsed as an empty string and its text was folded into the routing value, yielding a model id like "deepseek/deepseek-v4-flash Adversarial review lens evaluating...". Every discovered agent definition with a block scalar description was rewritten that way on session start. The antigravity agent set in Gentleman-Programming/gentle-ai uses `description: >` in 18 of 18 files, and the claude, cursor, kimi and kiro sets use it in 13, 10, 10 and 13 files respectively, so the damage was not limited to one adapter. Insert routing keys after a block scalar's continuation lines instead, and consolidate both writers into a single lib/agent-frontmatter.ts so the insertion rule is correct in exactly one place. A plain scalar description keeps its previous insertion point. tests/agent-frontmatter.test.ts covers block, literal, chomped and plain scalar descriptions, idempotence, key replacement and body preservation. Against the previous implementation 5 of its 12 cases fail.

coderabbitai · 2026-09-13T14:33:43Z

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Reviewing files that changed from the base of the PR and between bf6b6af and ed1c3ce.

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lib/agent-frontmatter.ts
tests/agent-frontmatter.test.ts

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📝 Walkthrough

Walkthrough

The change adds a shared helper for agent frontmatter routing. It preserves block-scalar descriptions, replaces existing routing keys, and is used by model routing and legacy asset migration. New tests cover insertion, replacement, stripping, idempotence, and frontmatter boundaries.

Changes

Agent frontmatter routing

Layer / File(s)	Summary
Shared frontmatter routing helper `lib/agent-frontmatter.ts`, `tests/agent-frontmatter.test.ts`	Adds `upsertAgentFrontmatterRouting` and tests routing insertion after block-scalar and plain descriptions, routing replacement, empty routing lists, missing frontmatter, and body preservation.
Model routing integration `extensions/gentle-ai.ts`	Builds routing lines and delegates frontmatter updates to the shared helper. The helper is also used for packaged and installed asset comparison.
Legacy asset integration `lib/sdd-preflight.ts`	Replaces the local routing updater with the shared helper for legacy asset comparison and migration.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested reviewers: alan-thegentleman

Merge Risk: ⚪ Minimal · up to ed1c3

The routing update preserves block-scalar descriptions and existing agent bodies, with no remaining actionable risk identified.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 22.22% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main fix: preventing model routing keys from being inserted inside YAML block scalar descriptions.
Linked Issues check	✅ Passed	Issue `#956` requires routing keys after all folded or literal block-scalar continuation lines, preservation of descriptions and bodies, consistent behavior in both writers, and support for affected pac…
Out of Scope Changes check	✅ Passed	The changes remain within Issue `#956`. The shared helper fixes the duplicated routing logic, and the tests verify the required scalar handling and preservation behavior. No unrelated product behavior i…

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Actionable comments posted: 1

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Inline comments:
In `@lib/agent-frontmatter.ts`:
- Line 42: Update the blank-line handling in routingInsertIndex to advance
insertIndex whenever a trimmed line is empty, including trailing blank
continuation lines in |+ or &gt;+ descriptions, so upsertAgentFrontmatterRouting
inserts model: or thinking: after the complete block scalar. Add a regression
test covering trailing blank lines and preserving the description value.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 5087405a-4930-4952-8c72-f22243327e75

📥 Commits

Reviewing files that changed from the base of the PR and between 963e17f and bf6b6af.

📒 Files selected for processing (4)

extensions/gentle-ai.ts
lib/agent-frontmatter.ts
lib/sdd-preflight.ts
tests/agent-frontmatter.test.ts

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coderabbitai Bot reviewed Sep 13, 2026

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Comment thread lib/agent-frontmatter.ts Outdated

fix(agents): preserve trailing blank lines in block scalar descriptions

ed1c3ce

Rogercode97 mentioned this pull request Sep 13, 2026

bug(agents): model routing breaks block scalar descriptions and empties them #956

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fix(agents): keep model routing keys out of block scalar descriptions - #969

fix(agents): keep model routing keys out of block scalar descriptions#969
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Rogercode97:fix/agent-frontmatter-block-scalar

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Rogercode97 commented Sep 13, 2026 •

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