Remove Language detection; drop Transfer call from the system tools table

[Him188]

Companion to fishaudio/platform-api#1266 (removes the language_detection system tool from the product).

• system-tools.mdx: table now lists only Hang up call; Transfer call leaves the toggle table (it has no switch — auto-enabled once a transfer destination is configured; its explanatory section stays). Builder section no longer points at a Configuration-page switch.
• voice-language.mdx: speaking language is now unconditional — detection table and Tip removed.
• tools.mdx / configuration.mdx / authenticated-sessions.mdx / llms.txt: passing mentions cleaned up.
• openapi.json: language_detection removed from AgentSystemToolsConfig / PublicSystemToolsPatch; session-creation description updated.

🤖 Generated with Claude Code

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Summary by CodeRabbit

• Documentation
  • Clarified that sessions use the configured speaking language by default.
  • Updated language override guidance to reflect current behavior.
  • Removed references to automatic language detection from voice and system tool documentation.
  • Updated system tool documentation to describe call hang-up functionality only.
  • Removed the language detection option from the API schema and session documentation.

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Project	Status	Preview	Updated (UTC)
hanabiaiinc	🔴 Failed	–	Aug 6, 2026, 9:56 AM

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Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 72b96d40-532a-4da8-a79b-15e91588ff16

📥 Commits

Reviewing files that changed from the base of the PR and between 1c7a5fc and b8ed70d.

📒 Files selected for processing (7)

• agents/build/configuration.mdx
• agents/build/system-tools.mdx
• agents/build/tools.mdx
• agents/build/voice-language.mdx
• agents/deploy/authenticated-sessions.mdx
• api-reference/openapi.json
• llms.txt

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📝 Walkthrough

Walkthrough

The documentation now states that sessions use the configured speaking language. System tool documentation lists call hang-up capability without automatic language detection or call transfer details. API reference schemas remove language-detection fields.

Changes

Language and system tool documentation

Layer / File(s)	Summary
Configured session language documentation agents/build/configuration.mdx, agents/build/voice-language.mdx, agents/deploy/authenticated-sessions.mdx, api-reference/openapi.json	Session language documentation now describes the configured speaking language. Language override and session API descriptions no longer reference automatic language detection.
Hang-up system tool documentation agents/build/system-tools.mdx, agents/build/tools.mdx, agents/build/voice-language.mdx, llms.txt	System tool descriptions now focus on call hang-up capability. Language detection and call transfer details were removed.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• fishaudio/docs#116: Updates the same agent documentation pages and introduced related language-detection and system-tool content.
• fishaudio/docs#119: Updates session-language behavior in the same documentation and API reference areas.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch remove-language-detection

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