# M5d-2 task 08: opted-in tool-output summaries

**Branch:** `m5d2`. Check it: `git branch --show-current` prints `m5d2` and `git status --short`
is empty; otherwise stop. Never switch branch.
**Commit subject:** `loopd: background ToolSummary for opted-in results`
**Log row:** the Task cell is `M5d2/08-loopd-tool-summary`.

## Goal

After a turn that logged an opted-in `ToolResult` with no matching `ToolSummary`, run a
no-tools completion on the background slot and append `ToolSummary` with the result's labels
(spec 4.3). `messages()` already ignores it (task 02). `http_fetch` opts in via
`[compact] summarise`.

`summarise::missing` is the function. `finish_turn` calls it on `Ok` and on `SessionFull`,
**before** compaction, so the current epoch still holds the `ToolResult` (README known
limits: v1 runs this inside the turn's hold).

The starter `config/summarise.md` is copied like `config/heartbeat.md`.

## Every place that changes

| Place | What happens there |
|---|---|
| `crates/loopd/src/summarise.rs` | new: `missing` |
| `crates/loopd/src/lib.rs` | `pub mod summarise;` |
| `crates/loopd/src/compact.rs` | `finish_turn` calls `missing` before compact (edit F1) |
| `config/summarise.md` | new, given starter |
| `crates/loopd/tests/tool_summary_call.rs` | new, given |
| everything else | **no change** |

## Files

- Copy, from `docs/plans/M5d2/files/` (the same path under it): the new test
  `crates/loopd/tests/tool_summary_call.rs` and the starter `config/summarise.md`.
- Create: `crates/loopd/src/summarise.rs` (function below).
- Modify: `crates/loopd/src/lib.rs`, `crates/loopd/src/compact.rs`,
  `docs/implementer-log.md`.
- Do not touch: any other file.

## Facts you need

- **Which results.** Walk `session.records()` once. From each `Assistant`, remember
  `tool_calls` by `id → name`. From each `ToolSummary`, remember `call: CallId`. Then for
  each `ToolResult` whose `tool_call_id` maps to a name in `cfg.compact.summarise` and whose
  `call` is not already summarised, queue it. Do not append while iterating `records()`.
- **The call.** `messages_with_carry(session.baseline(), session.records(), session.carry())`,
  then one `ChatMessage::User` whose content is
  `format!("{}\n\n{}", prompt.trim_end(), crate::compact::cap_chars(result_content, cfg.r#loop.tool_result_cap))`
  where `prompt` is `read_to_string` of
  `cfg.baseline.system.with_file_name("summarise.md")`. Missing file: return `Err` naming
  the path (do not guess). `ChatRequest { slot: cfg.slots.background, tools: Vec::new(),
  thinking: true, messages }`. `client.chat_with_retry(&request, &mut |_| {})`.
- **The record.** Completion `content.unwrap_or_default()`, `neutralise`, `cap_chars` to
  `cfg.compact.summary_chars`. Append `LogRecord::ToolSummary { time: Timestamp::now(),
  call, tool_call_id, content, class, untrusted }` copying `call`, `tool_call_id`, `class`,
  `untrusted` from that `ToolResult`.
- **Context-full / other infer errors.** Skip that result (log `loopd: tool summary: {e}`),
  continue the queue. Do not fail the turn.
- **`finish_turn`.** At the start of the `Ok(done)` arm and the `Err(SessionFull)` arm, before
  `compact_session`:

  ```rust
  if let Err(e) = crate::summarise::missing(rt.cfg, rt.client, session) {
      eprintln!("loopd: tool summary: {e}");
  }
  ```

  A compact-due turn summarises first, then compacts. The last given test goes through
  `finish_turn` (not `missing` alone) and expects a `ToolSummary`.
- **`cap_chars` is `pub(crate)`** in `compact.rs` (M5d-1 task 05).
- **`tool_call.http` calls `read_file`.** The last given test sets
  `summarise = ["read_file"]`. Default `["http_fetch"]` would leave it alone.
- rustfmt `mod` order: `summarise` after `sse` / `session` as rustfmt decides.
- The items the edits use. This table is complete.

  | Item | What it does |
  |---|---|
  | `messages_with_carry` | prefix plus carry |
  | `ChatRequest.tools: Vec::new()` | omits `tools` on the wire |
  | `neutralise` | `bxcore::sanitize` |
  | `cap_chars` | character cap |
  | `Session::append` | the new record |

## The function

`crates/loopd/src/summarise.rs`:

```rust
//! Opted-in tool-output summaries (M5d spec, section 4.3).

use crate::baseline::messages_with_carry;
use crate::compact::cap_chars;
use crate::config::Config;
use crate::llama::{ChatMessage, ChatRequest, Client};
use crate::session::Session;
use bxcore::sanitize::neutralise;
use bxcore::{CallId, DataClass, LogRecord, Timestamp, ToolCall};
use std::collections::{HashMap, HashSet};

/// Append a `ToolSummary` for each opted-in `ToolResult` in this epoch that does not yet have
/// one. Inference uses the background slot and no tools.
pub fn missing(
    cfg: &Config,
    client: &Client,
    session: &mut Session,
) -> Result<(), String> {
    let path = cfg.baseline.system.with_file_name("summarise.md");
    let prompt = std::fs::read_to_string(&path)
        .map_err(|e| format!("{}: {e}", path.display()))?;
    let mut names: HashMap<String, String> = HashMap::new();
    let mut done: HashSet<u64> = HashSet::new();
    let mut pending: Vec<(CallId, String, String, DataClass, bool)> = Vec::new();
    for record in session.records() {
        match record {
            LogRecord::Assistant { tool_calls, .. } => {
                for ToolCall { id, name, .. } in tool_calls {
                    names.insert(id.clone(), name.clone());
                }
            }
            LogRecord::ToolSummary { call, .. } => {
                done.insert(call.0);
            }
            LogRecord::ToolResult {
                call,
                tool_call_id,
                content,
                class,
                untrusted,
                ..
            } => {
                if done.contains(&call.0) {
                    continue;
                }
                let Some(name) = names.get(tool_call_id) else {
                    continue;
                };
                if !cfg.compact.summarise.iter().any(|n| n == name) {
                    continue;
                }
                pending.push((
                    *call,
                    tool_call_id.clone(),
                    content.clone(),
                    *class,
                    *untrusted,
                ));
            }
            _ => {}
        }
    }
    for (call, tool_call_id, content, class, untrusted) in pending {
        let mut messages = messages_with_carry(session.baseline(), session.records(), session.carry());
        messages.push(ChatMessage::User {
            content: format!(
                "{}\n\n{}",
                prompt.trim_end(),
                cap_chars(&content, cfg.r#loop.tool_result_cap)
            ),
        });
        let request = ChatRequest {
            slot: cfg.slots.background,
            messages,
            tools: Vec::new(),
            thinking: true,
        };
        let text = match client.chat_with_retry(&request, &mut |_| {}) {
            Ok(completion) => completion.content.unwrap_or_default(),
            Err(e) => {
                eprintln!("loopd: tool summary: {e}");
                continue;
            }
        };
        let text = cap_chars(neutralise(&text).as_ref(), cfg.compact.summary_chars);
        session
            .append(LogRecord::ToolSummary {
                time: Timestamp::now(),
                call,
                tool_call_id,
                content: text,
                class,
                untrusted,
            })
            .map_err(|e| e.to_string())?;
    }
    Ok(())
}
```

`CallId` is a tuple struct `CallId(pub u64)` (already used as `CallId(1)` in tests). If
`call.0` does not compile, stop and report.

### `crates/loopd/src/compact.rs`

**F1.** The `Ok(done)` arm. The lines

```rust
        Ok(done) => {
            if let Some(usage) = session.last_usage()
                && due(&usage, rt.cfg.compact.threshold, rt.cfg.expect.n_ctx)
                && let Err(e) = compact_session(session, rt, memory)
            {
                log_compact(session, &e);
            }
            Ok(done)
        }
```

become the same, with the `missing` call inserted as the first statement of the arm (see
Facts). The `Err(TurnError::SessionFull)` arm gets the same `missing` call before
`compact_session`.

## Steps

- [ ] **1. Copy the given files.**

  ```sh
  cp docs/plans/M5d2/files/crates/loopd/tests/tool_summary_call.rs crates/loopd/tests/
  cp docs/plans/M5d2/files/config/summarise.md config/summarise.md
  ```

- [ ] **2. See it fail.** `cargo build --tests --keep-going -p loopd`, timeout 600000 ms: test
  target `tool_summary_call` does not compile (`E0432` unresolved `loopd::summarise`). Every
  other target compiles.
- [ ] **3. The edits.** `summarise.rs`, `pub mod summarise;`, F1. `cargo check -p loopd`
  prints no error and no warning. `wc -l crates/loopd/src/summarise.rs` and
  `wc -l crates/loopd/src/compact.rs` each ≤ 500.
- [ ] **4. The tests.** `cargo test -p loopd --test tool_summary_call --test
  tool_summary_messages --test compact_turn --test turn`: every test passes, 6 in
  `tool_summary_call`.
- [ ] **5. Check.** `git diff --stat` lists `crates/loopd/src/summarise.rs`,
  `crates/loopd/src/lib.rs`, `crates/loopd/src/compact.rs`.
- [ ] **6. Run the gate.** `cargo fmt --all`, then `make gate`, timeout 600000 ms. Last line
  `gate: ok`. Test count **1562** (1556 before, plus 6).
- [ ] **7. Log and commit.** Task cell `M5d2/08-loopd-tool-summary`. Stage with
  `git add crates/loopd config/summarise.md docs/implementer-log.md Cargo.lock`, then commit
  as `AGENTS.md` says.

## Done when

- `make gate` prints `gate: ok` with 1562 tests.
- `git diff HEAD~1 --stat` lists only `crates/loopd/src/summarise.rs`,
  `crates/loopd/src/lib.rs`, `crates/loopd/src/compact.rs`,
  `crates/loopd/tests/tool_summary_call.rs`, `config/summarise.md` and the log.

## Stop and report if

- The branch check fails; a "before" block is not found exactly once; step 2 differs; `cargo
  check` warns; a test fails; the gate count is not 1562; you send tools on the summary
  request; you send `slots.main`; you replay the summary in `messages()`; you summarise a
  name not in the list; you summarise twice; you compact before summarising.

## What the given tests pin

An opted-in result is summarised on slot 1 with no `tools` key; labels are copied; a name not
in the list is left alone; a second `missing` does not call again; `messages()` is unchanged
after a summary; `finish_turn` after a `read_file` turn appends a `ToolSummary` on slot 1.