harn-stdlib 0.10.145

Embedded Harn standard library source catalog
Documentation 
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import {
  ConfidenceKind,
  EvaluationPolicy,
  EvaluationQuestion,
  choice,
  evaluation_windows,
} from "std/predicate"

pub type CompactionClassifyItem = {index: int, role: string, content: string}

pub type CompactionClassifyChoice = "keep" | "reword" | "drop"

pub type CompactionClassifyDecision = {
  index: int,
  question_id: string,
  choice: CompactionClassifyChoice,
  confidence: float,
  confidence_kind: ConfidenceKind,
  evaluation_receipt: string,
}

pub type CompactionFixtureInput = {items: list<CompactionClassifyItem>, anchor: string, round: int}

pub type CompactionClassifyDecisions = list<CompactionClassifyDecision>

pub type CompactionClassifyFixture = fn(CompactionFixtureInput) -> CompactionClassifyDecisions

pub type CompactionClassifyRequest = {
  items: list<CompactionClassifyItem>,
  anchor: string,
  round: int,
  budget_tokens: int,
  max_questions: int,
  policy: EvaluationPolicy,
  fixture?: CompactionClassifyFixture,
}

pub type CompactionClassifyRound = {
  kind: "answered" | "unavailable" | "window_refused",
  decisions: list<CompactionClassifyDecision>,
  reason: string,
}

/**
 * Classify one round through the shared evaluator. Compaction owns confidence
 * floors and message application; this export only batches questions and
 * preserves the evaluator's reported answers.
 *
 * @effects: [llm.call]
 * @errors: ["invalid window budget", "invalid classifier answer", "cancelled"]
 */
pub fn classify_compaction_round(
  harness: {fs: HarnessFs, llm: HarnessLlm},
  request: CompactionClassifyRequest,
) -> CompactionClassifyRound {
  const planning = try {
    evaluation_windows(
      harness.llm,
      request.items,
      {
        anchor: request.anchor,
        budget_tokens: request.budget_tokens,
        max_items: request.max_questions,
      },
    )
  }
  if is_err(planning) {
    return {kind: "window_refused", decisions: [], reason: to_string(unwrap_err(planning))}
  }
  const planned = unwrap(planning)
  if request?.fixture != nil {
    return {
      kind: "answered",
      decisions: request.fixture(
        {items: request.items, anchor: request.anchor, round: request.round},
      ),
      reason: "",
    }
  }
  let decisions: list<CompactionClassifyDecision> = []
  for window in planned.windows {
    const items = request.items.slice(window.first_index, window.last_index + 1)
    let questions: dict<string, EvaluationQuestion> = {}
    for item in items {
      questions["message_" + to_string(item.index)] = choice(
        harness.fs.render_prompt(
          "std/agent/prompts/compaction_classify.harn.prompt",
          {index: item.index},
        ),
        {
          keep: "Keep the complete original message because its details remain necessary.",
          reword: "Keep the information in a faithful short rewrite; full detail is unnecessary.",
          drop: "Remove the message because it is irrelevant, redundant, or superseded.",
        },
      )
    }
    const state: {anchor: string, items: list<CompactionClassifyItem>} = {
      anchor: request.anchor,
      items: items,
    }
    const outcome = harness.llm.evaluate_request(
      "agent.compaction.classify.v1",
      state,
      questions,
      request.policy + {threshold: 0.0},
    )
    match outcome.kind {
      "cancelled" -> {
        throw {category: "cancelled", message: "compaction classification cancelled"}
      }
      "answered" -> {
        for item in items {
          const question_id = "message_" + to_string(item.index)
          const answer = outcome.value[question_id]
          if answer.kind != "choice"
            || (answer.choice != "keep" && answer.choice != "reword" && answer.choice != "drop") {
            throw "invalid classifier answer"
          }
          decisions = decisions
            + [
              {
                index: item.index,
                question_id: question_id,
                choice: answer.choice,
                confidence: answer.confidence,
                confidence_kind: answer.confidence_kind,
                evaluation_receipt: outcome.receipt,
              },
            ]
        }
      }
      _ -> { return {
        kind: "unavailable",
        decisions: [],
        reason: outcome.kind + ": " + outcome.receipt,
      } }
    }
  }
  return {kind: "answered", decisions: decisions, reason: ""}
}