docs(benchmark): add two calibrated custom-mode routing profiles

[gburachas]

Closes #353.

What

Two routing profiles for benchmark/routing-profiles/, alongside the existing TB-2.1 escalation profile:

• tau2-telecom-custom-opus-qwen-balanced.toml
• tau2-telecom-custom-opus-qwen-aggressive.toml

They are the same deployment at two operating points, so the difference between them is the routing behaviour and nothing else.

Why these two

They demonstrate a configuration nothing else in the repository shows: mode = "custom" with a target_selector policy, where the classifier answers with a target name and policy.selector reads it out of the verdict. The existing tb21-escalation-*.toml profile covers escalation mode.

They also use classify_trigger = "user_turn" from #487, which is the setting this traffic shape calls for: the classifier re-runs when the user speaks again and the chosen tier is held across the tool calls in between, so a tool chain does not switch tier mid-task.

Calibration

Following the discussion on #353, each file records what it was calibrated against, including the operating point as a number:

	Solve rate	Turns served by the weak tier
balanced	0.903 ± 0.071	45%
aggressive	0.891 ± 0.029	~85%

Measured on tau2-bench telecom customer support, full 114 tasks, with Claude Opus 4.7 as the strong tier and an on-device Qwen3.6-35B-A3B as both the weak tier and the classifier. The prompt in each file is the rubric that was measured.

The headers are explicit that the model wiring here is not what was measured: the runs used internal endpoints and an on-device weak tier, and these files use the closest publicly reachable OpenRouter models so they run as written. The routing parameters and rubric are exactly as run. Each file also states that the figures describe that tier pair on that traffic, and that a different pair or domain needs recalibrating.

Scope

Configuration only. No library, server or benchmark-runner changes.

The lane runners that produced these numbers (tau2, tau3, GAIA, TB-Lite) are not included. They depend on external benchmark checkouts and per-deployment endpoints, which puts them on the wrong side of the "if it only makes sense against one deployment, it is not an example" line from #353. They stay in our own repository.

How tested

Both files load against the current server:

switchyard-server --config benchmark/routing-profiles/tau2-telecom-custom-opus-qwen-balanced.toml --dry-run
switchyard-server --config benchmark/routing-profiles/tau2-telecom-custom-opus-qwen-aggressive.toml --dry-run

uv run ruff check . passes. Commit signed off per the DCO.

Summary by CodeRabbit

• New Features
  • Added aggressive and balanced routing profiles for telecom customer-support scenarios.
  • Introduced two-tier model selection, routing routine requests to a lightweight model and complex requests to a stronger model.
  • Added confidence-based classification, abstention, escalation guidance, and route visibility.
  • Preserved the selected model tier across tool calls for consistent interactions.

[coderabbitai]

Walkthrough

This change adds balanced and aggressive telecom routing profiles. Each profile configures OpenRouter targets, classifier-based user-turn routing, structured route responses, routing prompts, and target selection through /route.

Changes

Telecom routing profiles

Layer / File(s)	Summary
Balanced profile targets and metadata benchmark/routing-profiles/tau2-telecom-custom-opus-qwen-balanced.toml	The profile documents licensing, calibration, deployment, and operating-point details. It defines the OpenRouter client and strong, weak, and classifier targets.
Balanced classifier route benchmark/routing-profiles/tau2-telecom-custom-opus-qwen-balanced.toml	The route classifies user turns with a six-turn context window, validates strict JSON output, preserves the selected target across tool calls, applies weak/strong routing criteria, and reads the target from /route.
Aggressive routing profile benchmark/routing-profiles/tau2-telecom-custom-opus-qwen-aggressive.toml	The new profile configures OpenRouter targets, classifier routing, structured responses, routing criteria, tool-call target stickiness, and weak-tier defaulting.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🔵 Low · up to 06958

The profiles can route an abstained request to the weak tier unless the rubric requires abstentions to select the strong tier. This is a bounded correctness issue in both example configurations and is mergeable with explicit owner follow-up.

Poem

A rabbit hops through routes so bright,
Weak for day and strong for night.
JSON guides each careful turn,
Tool calls keep the path they learn.
Telecom flows now swiftly start.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the addition of two calibrated custom-mode routing profiles.
Linked Issues check	✅ Passed	The two native TOML profiles satisfy issue #353 by adding calibrated custom-mode examples without run artifacts or ground truth.
Out of Scope Changes check	✅ Passed	The changes are limited to two routing-profile TOML files and match the linked issue's in-scope repository examples.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@benchmark/routing-profiles/tau2-telecom-custom-opus-qwen-balanced.toml`:
- Around line 104-105: Update the abstention routing policy so abstentions
require the strong route, ensuring target_selector selects the strong target.
Apply this change at
benchmark/routing-profiles/tau2-telecom-custom-opus-qwen-balanced.toml lines
104-105 and
benchmark/routing-profiles/tau2-telecom-custom-opus-qwen-aggressive.toml lines
92-93.

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📥 Commits

Reviewing files that changed from the base of the PR and between c93d450 and 06958fb.

📒 Files selected for processing (2)

• benchmark/routing-profiles/tau2-telecom-custom-opus-qwen-aggressive.toml
• benchmark/routing-profiles/tau2-telecom-custom-opus-qwen-balanced.toml

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