ai-agent-book 精选快照（<2MB 代码与文档，来自 github.com/bojieli/ai-agent-book）

chapter7/tau2-bench-eval/README.md

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+# Experiment 7-1: τ²-bench telecom evaluation
+
+This directory retains the bounded τ²-bench campaign requested by the
+manuscript: five telecom tasks, one trial per task, with the same model acting
+as the customer-service Agent and user simulator.
+
+## Code map
+
+- **Run first:** follow the pinned external checkout command below and run one task with num-trials 1.
+- **Start here:** the τ²-bench CLI is the runner; this directory is the reproducibility and evidence wrapper.
+- **Core behavior:** the external telecom environment executes the Agent/user turns; this project records the resulting trajectory.
+- **State / protocol:** saved raw trajectory, task seed, model IDs and run manifest under validation/runs/.
+- **Verifier:** task reward plus the chapter acceptance checks; inspect the failed task record, not only the 4/5 aggregate.
+- **Experiment variable:** fixed task set, model pair, concurrency and seed.
+- **Skip on first pass:** upstream framework internals and cost-report formatting.
+
+## Reproduction
+
+The external checkout is deliberately not vendored. Clone and pin the
+authoritative source first:
+
+```bash
+git clone https://github.com/sierra-research/tau2-bench.git chapter7/tau2-bench
+git -C chapter7/tau2-bench checkout --detach 8d005b0e5b9e4af0bc055886fa7f95fc86d1710e
+cd chapter7/tau2-bench
+uv venv --python 3.12
+uv pip install -e .
+```
+
+With `OPENROUTER_API_KEY` configured, the saved campaign used:
+
+```bash
+.venv/bin/tau2 run \
+  --domain telecom \
+  --agent-llm openrouter/openai/gpt-4.1-mini \
+  --user-llm openrouter/openai/gpt-4.1-mini \
+  --num-trials 1 \
+  --num-tasks 5 \
+  --max-concurrency 3 \
+  --save-to exp7-1-openrouter-gpt41mini-telecom-5tasks-20260802-v1 \
+  --log-level INFO
+```
+
+Both model temperatures were `0`; τ²-bench recorded seed `300`. The retained
+raw trajectory is under
+[`validation/runs/exp7-1-openrouter-gpt41mini-telecom-20260802-v1/`](validation/runs/exp7-1-openrouter-gpt41mini-telecom-20260802-v1/).
+
+## Result
+
+The Agent passed 4/5 tasks, for average reward and Pass@1 of **0.80**. All five
+simulations ended normally with `user_stop`; there were no provider errors.
+The retained provider-reported costs total about **$0.151312**: $0.112672 for
+the Agent and $0.0386396 for the user simulator.
+
+The failed task was
+`[mobile_data_issue]data_saver_mode_on|data_usage_exceeded[PERSONA:Easy]`.
+The customer supplied phone `555-123-2002`, but the Agent selected line
+`L1001`. A later `get_details_by_id(L1001)` result explicitly associated that
+line with phone `555-123-2001`; nevertheless, the Agent continued using its
+3.2/5 GB usage reading. It correctly had the user disable Data Saver, but did
+not inspect the matching `L1002` line or perform the required 2 GB data refuel.
+It spent the remainder of a 71-message trajectory on unrelated diagnostics and
+ultimately transferred to a human. Consequently, `refuel_data` and all three
+downstream environment assertions failed. The trajectory also exposes an
+earlier policy violation where the Agent emitted two customer-lookup tool calls
+in one turn even though the telecom policy permits only one at a time.
+
+This is a useful dual-control failure: the user-side Data Saver action occurred
+and was verified in the shared environment, while the Agent-side line-selection
+mistake prevented the second state mutation and final recovery.
+
+## Verification boundary
+
+The upstream public verifier reports:
+
+- format validation: passed;
+- trial-count validation: passed;
+- task validation: failed because a public leaderboard submission must cover
+  the full telecom task set.
+
+That coverage failure is expected for the five-task command specified by this
+book experiment. This evidence therefore establishes the bounded Experiment
+7-1 campaign, not a full-domain τ²-bench leaderboard result. See
+[`evidence.json`](validation/runs/exp7-1-openrouter-gpt41mini-telecom-20260802-v1/evidence.json)
+for machine-readable outcomes and [`manifest.json`](validation/runs/exp7-1-openrouter-gpt41mini-telecom-20260802-v1/manifest.json)
+for content hashes.