diff --git a/README.md b/README.md
index a2908601663..1a229c7996c 100644
--- a/README.md
+++ b/README.md
@@ -86,7 +86,8 @@ In about 30 seconds, you have a typed `source → task → sink` graph that prin
 first messages and records `logs/hello-copper.copper`. Start with
 `copperconfig.ron`, `src/main.rs`, and `src/tasks.rs`; the generated `justfile`
 also provides helpers for logs, CopperLists, topology (`just dag`), the exact
-generated process schedule (`just plan`), and replay.
+generated process schedule (`just plan`), post-execution timing from the default
+Copper log (`just plan-log`), and replay.
 
 ## How Copper Fits Together
 
diff --git a/examples/cu_caterpillar/README.md b/examples/cu_caterpillar/README.md
index 331d1e5216f..7cd62e4e08c 100644
--- a/examples/cu_caterpillar/README.md
+++ b/examples/cu_caterpillar/README.md
@@ -12,3 +12,4 @@ See the crate cu29 for more information about the Copper project.
 - `just resim` — rerun the logged mission from `logs/caterpillar.copper`.
 - `just resim-debug` — start the replay-backed remote debug server for `logs/caterpillar.copper`.
 - `just dag-logstats` — generate logstats and open an annotated DAG SVG for the current `copperconfig.ron`.
+- `just plan-log` — auto-detect the default log and logreader, then append packed, proportional observed task timing to `plan.svg`.
diff --git a/support/cargo_cunew/src/lib.rs b/support/cargo_cunew/src/lib.rs
index 3f004a7b91c..551430cd360 100644
--- a/support/cargo_cunew/src/lib.rs
+++ b/support/cargo_cunew/src/lib.rs
@@ -608,6 +608,8 @@ mod tests {
         assert!(justfile.contains("dag:"));
         assert!(justfile.contains("[positional-arguments]"));
         assert!(justfile.contains("plan *options:"));
+        assert!(justfile.contains("plan-log:"));
+        assert!(justfile.contains("log-stats"));
         assert!(justfile.contains("--bin cu29-plan"));
     }
 
@@ -648,6 +650,8 @@ mod tests {
         assert!(app_manifest.contains("edition = \"2024\""));
         assert!(justfile.contains("cu29-rendercfg"));
         assert!(justfile.contains("cu29-plan"));
+        assert!(justfile.contains("plan-log:"));
+        assert!(justfile.contains("log-stats"));
         assert!(!project.join(".git").exists());
     }
 
diff --git a/support/cargo_cunew/templates/README.md b/support/cargo_cunew/templates/README.md
index 5156d54a0cb..dae369b7f55 100644
--- a/support/cargo_cunew/templates/README.md
+++ b/support/cargo_cunew/templates/README.md
@@ -90,7 +90,8 @@ The generated project includes helper commands in its `justfile`:
 * `just resim`: Replay the recorded log once into a fresh replay log.
 * `just resim-debug`: Start the replay-backed remote debug server manually.
 * `just dag`: Render the application's execution Directed Acyclic Graph (DAG). Local-checkout templates run the tool from the Copper repo; crates.io and git templates use `cu29-rendercfg` from `PATH` or install the matching `cu29-runtime` on demand. `just rcfg` remains as a compatibility alias.
-* `just plan`: Render the exact generated per-CopperList process order as `plan.svg`, with serial and `parallel-rt` projections. Pass `mission=<id>` or `features=<a,b>` when needed. Templates use the local `cu29-plan` binary or install the matching `cu29-runtime` on demand.
+* `just plan`: Render the exact generated per-CopperList process order as `plan.svg`, with serial and `parallel-rt` projections. Pass `log=logs/<app>.copper` to append packed typical/slowest timelines whose back-to-back segments remain proportional to recorded task duration, or `mission=<id>` / `features=<a,b>` when needed. Templates use the local `cu29-plan` binary or install the matching `cu29-runtime` on demand.
+* `just plan-log`: Render the same SVG with observed timing from the project's default Copper log.
 
 Set `APP_NAME=test-workspace-demo APP_DIR=test_workspace-demo` to target the demo app (for example, `APP_NAME=test-workspace-demo APP_DIR=test_workspace-demo just log`).
 
diff --git a/support/cargo_cunew/templates/cu_full/README.md b/support/cargo_cunew/templates/cu_full/README.md
index 407198067a9..4ec17bc6300 100644
--- a/support/cargo_cunew/templates/cu_full/README.md
+++ b/support/cargo_cunew/templates/cu_full/README.md
@@ -9,7 +9,7 @@ This template bootstraps a Copper workspace with an app crate and a shared-compo
 - `components/bridges/cu_example_shared_bridge/`: shared bridge example crate.
 - `components/`: shared components by category (placeholders to extend).
 - `doc/`: design notes and project docs.
-- `justfile`: automation helpers like `just dag` for topology, `just plan` for generated process order, `just log`, `just cl`, `just resim`, and `just resim-debug` (`just rcfg` remains as a compatibility alias).
+- `justfile`: automation helpers like `just dag` for topology, `just plan` for generated or log-observed process timing, `just log`, `just cl`, `just resim`, and `just resim-debug` (`just rcfg` remains as a compatibility alias).
 
 ## Quick start
 
diff --git a/support/cargo_cunew/templates/cu_full/justfile b/support/cargo_cunew/templates/cu_full/justfile
index be111dddaaa..583c035f087 100644
--- a/support/cargo_cunew/templates/cu_full/justfile
+++ b/support/cargo_cunew/templates/cu_full/justfile
@@ -40,18 +40,30 @@ plan *options:
   args=("$config" --output "$output" --open)
   mission_value=""
   features_value=""
+  log_value=""
   for option in "$@"; do
     case "$option" in
       mission=*) mission_value="${option#mission=}" ;;
       features=*) features_value="${option#features=}" ;;
+      log=*) log_value="${option#log=}" ;;
       *)
-        echo "Unknown plan option '$option'; expected mission=<id> or features=<a,b>." >&2
+        echo "Unknown plan option '$option'; expected mission=<id>, features=<a,b>, or log=<file>." >&2
         exit 2
         ;;
     esac
   done
   [[ -z "$mission_value" ]] || args+=(--mission "$mission_value")
   [[ -z "$features_value" ]] || args+=(--features "$features_value")
+  if [[ -n "$log_value" ]]; then
+    APP_NAME="${APP_NAME:-${APP_DIR}}"
+    [[ "$log_value" != *_0.copper ]] || log_value="${log_value%_0.copper}.copper"
+    stats="apps/${APP_DIR}/target/cu29_plan_logstats.json"
+    mkdir -p "$(dirname "$stats")"
+    logreader_args=(-p "$APP_NAME" --features=logreader --bin "${APP_NAME}-logreader" -- "$log_value" log-stats --config "$config" --output "$stats" --features logreader)
+    [[ -z "$mission_value" ]] || logreader_args+=(--mission "$mission_value")
+    cargo run "${logreader_args[@]}"
+    args+=(--logstats "$stats")
+  fi
   {% if copper_source == "local" %}
   cargo run --manifest-path "{{copper_root_path}}/Cargo.toml" -p cu29-runtime --bin cu29-plan -- "${args[@]}"
   {% else %}
@@ -70,6 +82,13 @@ plan *options:
   "$planner" "${args[@]}"
   {% endif %}
 
+# Render observed timing from the selected app's default Copper log.
+plan-log:
+  #!/usr/bin/env bash
+  APP_DIR="${APP_DIR:-cu_example_app}"
+  APP_NAME="${APP_NAME:-${APP_DIR}}"
+  just plan "log=apps/${APP_DIR}/logs/${APP_NAME}.copper" features=logreader
+
 # Extract the structured log via the log reader.
 log:
   #!/usr/bin/env bash
diff --git a/support/cargo_cunew/templates/cu_project/README.md b/support/cargo_cunew/templates/cu_project/README.md
index d79f6020832..cc5c29afe4c 100644
--- a/support/cargo_cunew/templates/cu_project/README.md
+++ b/support/cargo_cunew/templates/cu_project/README.md
@@ -9,7 +9,7 @@ This template bootstraps a single-crate Copper project for quick experiments.
 - `src/resim.rs`: replay binary with one-shot replay and remote-debug server modes.
 - `src/tasks.rs`: sample tasks.
 - `copperconfig.ron`: runtime configuration.
-- `justfile`: automation helpers like `just log`, `just cl`, `just resim`, `just resim-debug`, `just dag` for topology, and `just plan` for generated process order (`just rcfg` remains as a compatibility alias).
+- `justfile`: automation helpers like `just log`, `just cl`, `just resim`, `just resim-debug`, `just dag` for topology, and `just plan` for generated or log-observed process timing (`just rcfg` remains as a compatibility alias).
 
 ## Quick start
 
diff --git a/support/cargo_cunew/templates/cu_project/justfile b/support/cargo_cunew/templates/cu_project/justfile
index 6a0d53ddccd..ad204da8ae5 100644
--- a/support/cargo_cunew/templates/cu_project/justfile
+++ b/support/cargo_cunew/templates/cu_project/justfile
@@ -71,18 +71,28 @@ plan *options:
   args=(copperconfig.ron --output plan.svg --open)
   mission_value=""
   features_value=""
+  log_value=""
   for option in "$@"; do
     case "$option" in
       mission=*) mission_value="${option#mission=}" ;;
       features=*) features_value="${option#features=}" ;;
+      log=*) log_value="${option#log=}" ;;
       *)
-        echo "Unknown plan option '$option'; expected mission=<id> or features=<a,b>." >&2
+        echo "Unknown plan option '$option'; expected mission=<id>, features=<a,b>, or log=<file>." >&2
         exit 2
         ;;
     esac
   done
   [[ -z "$mission_value" ]] || args+=(--mission "$mission_value")
   [[ -z "$features_value" ]] || args+=(--features "$features_value")
+  if [[ -n "$log_value" ]]; then
+    mkdir -p target
+    [[ "$log_value" != *_0.copper ]] || log_value="${log_value%_0.copper}.copper"
+    logreader_args=(--features=logreader --bin {{project-name|kebab_case}}-logreader -- "$log_value" log-stats --config copperconfig.ron --output target/cu29_plan_logstats.json --features logreader)
+    [[ -z "$mission_value" ]] || logreader_args+=(--mission "$mission_value")
+    cargo run "${logreader_args[@]}"
+    args+=(--logstats target/cu29_plan_logstats.json)
+  fi
   {% if copper_source == "local" %}
   cargo run --manifest-path "{{copper_root_path}}/Cargo.toml" -p cu29-runtime --bin cu29-plan -- "${args[@]}"
   {% else %}
@@ -100,3 +110,7 @@ plan *options:
   [[ -x "$planner" ]] || { echo "Failed to find cu29-plan after installation." >&2; exit 1; }
   "$planner" "${args[@]}"
   {% endif %}
+
+# Render observed timing from the project's default Copper log.
+plan-log:
+  just plan log=logs/{{project-name|kebab_case}}.copper features=logreader
diff --git a/support/ci/plan_defaults.py b/support/ci/plan_defaults.py
new file mode 100644
index 00000000000..06b70600ef2
--- /dev/null
+++ b/support/ci/plan_defaults.py
@@ -0,0 +1,97 @@
+#!/usr/bin/env python3
+
+"""Discover the local Copper log and typed logreader used by `just plan-log`."""
+
+from __future__ import annotations
+
+import json
+import re
+import subprocess
+import sys
+from pathlib import Path
+from typing import Any
+
+
+def fail(message: str) -> None:
+    raise SystemExit(f"plan-log: {message}")
+
+
+def copper_log_bases(directory: Path) -> list[Path]:
+    logs = directory / "logs"
+    bases: set[Path] = set()
+    for path in logs.glob("*.copper"):
+        name = re.sub(r"_\d+\.copper$", ".copper", path.name)
+        bases.add(logs / name)
+    return sorted(bases)
+
+
+def choose_log(candidates: list[Path]) -> Path:
+    if not candidates:
+        fail("no logs/*.copper slabs found; run the example first")
+    preferred = [
+        path
+        for path in candidates
+        if "resim" not in path.stem and "replay" not in path.stem
+    ]
+    if preferred:
+        candidates = preferred
+    non_compute = [path for path in candidates if "compute" not in path.stem]
+    if non_compute:
+        candidates = non_compute
+    if len(candidates) != 1:
+        names = ", ".join(path.name for path in candidates)
+        fail(f"multiple plausible logs ({names}); use `just plan log=... bin=...`")
+    return candidates[0]
+
+
+def choose_logreader(targets: list[dict[str, Any]], log: Path) -> dict[str, Any]:
+    candidates = [
+        target
+        for target in targets
+        if "bin" in target.get("kind", []) and "logreader" in target.get("name", "")
+    ]
+    if not candidates:
+        fail("this example has no typed logreader binary")
+    wants_compute = "compute" in log.stem
+    matched = [
+        target
+        for target in candidates
+        if ("compute" in target["name"]) == wants_compute
+    ]
+    if matched:
+        candidates = matched
+    if len(candidates) != 1:
+        names = ", ".join(target["name"] for target in candidates)
+        fail(f"multiple plausible logreaders ({names}); use `just plan log=... bin=...`")
+    return candidates[0]
+
+
+def main() -> None:
+    if len(sys.argv) != 2:
+        fail("expected the example directory")
+    directory = Path(sys.argv[1]).resolve()
+    metadata = json.loads(
+        subprocess.check_output(
+            ["cargo", "metadata", "--format-version", "1", "--no-deps"],
+            cwd=directory,
+            text=True,
+            encoding="utf-8",
+        )
+    )
+    packages = [
+        package
+        for package in metadata.get("packages", [])
+        if Path(package["manifest_path"]).resolve().parent == directory
+    ]
+    if len(packages) != 1:
+        fail(f"could not identify one Cargo package in {directory}")
+    log = choose_log(copper_log_bases(directory))
+    target = choose_logreader(packages[0].get("targets", []), log)
+    required_features = target.get("required-features", [])
+    print(target["name"])
+    print(",".join(required_features))
+    print(log)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/support/just/plan.just b/support/just/plan.just
index b3c1980e3a3..8d5481180e8 100644
--- a/support/just/plan.just
+++ b/support/just/plan.just
@@ -11,13 +11,19 @@ plan *options:
   mission_value=""
   features_value=""
   config_value=""
+  log_value=""
+  bin_value=""
+  log_features_value=""
   for option in "$@"; do
     case "$option" in
       mission=*) mission_value="${option#mission=}" ;;
       features=*) features_value="${option#features=}" ;;
       config=*) config_value="${option#config=}" ;;
+      log=*) log_value="${option#log=}" ;;
+      bin=*) bin_value="${option#bin=}" ;;
+      logfeatures=*) log_features_value="${option#logfeatures=}" ;;
       *)
-        echo "Unknown plan option '$option'; expected mission=<id>, features=<a,b>, or config=<file>." >&2
+        echo "Unknown plan option '$option'; expected mission=<id>, features=<a,b>, config=<file>, log=<file>, bin=<logreader>, or logfeatures=<a,b>." >&2
         exit 2
         ;;
     esac
@@ -64,5 +70,51 @@ plan *options:
     args+=(--features "$features_value")
   fi
 
+  if [[ -n "$log_value" ]]; then
+    [[ -n "$bin_value" ]] || { echo "bin=<logreader> is required with log=<file>." >&2; exit 2; }
+    if [[ "$log_value" = /* ]]; then
+      log_path="$log_value"
+    else
+      log_path="${invocation_dir}/${log_value}"
+    fi
+    [[ "$log_path" != *_0.copper ]] || log_path="${log_path%_0.copper}.copper"
+    log_slab="${log_path%.copper}_0.copper"
+    [[ -f "$log_path" || -f "$log_slab" ]] || { echo "Copper log not found: $log_path" >&2; exit 1; }
+    stats_path="${output_dir}/target/cu29_plan_logstats.json"
+    mkdir -p "$(dirname "$stats_path")"
+    logreader_args=(run --bin "$bin_value")
+    [[ -z "$log_features_value" ]] || logreader_args+=(--features "$log_features_value")
+    logreader_args+=(-- "$log_path" log-stats --config "$cfg_path" --output "$stats_path")
+    [[ -z "$mission_value" ]] || logreader_args+=(--mission "$mission_value")
+    config_features_value="$features_value"
+    [[ -n "$config_features_value" ]] || config_features_value="$log_features_value"
+    [[ -z "$config_features_value" ]] || logreader_args+=(--features "$config_features_value")
+    (cd "$invocation_dir" && cargo "${logreader_args[@]}")
+    args+=(--logstats "$stats_path")
+  fi
+
   cd "{{PLAN_WORKSPACE_ROOT}}"
   cargo run -p cu29-runtime --bin cu29-plan -- "${args[@]}"
+
+# Render observed timing from this example's default local Copper log.
+[positional-arguments]
+plan-log *options:
+  #!/usr/bin/env bash
+  set -euo pipefail
+
+  invocation_dir="{{invocation_directory()}}"
+  defaults="$(python3 "{{PLAN_WORKSPACE_ROOT}}/support/ci/plan_defaults.py" "$invocation_dir")"
+  bin_default="$(printf '%s\n' "$defaults" | sed -n '1p')"
+  features_default="$(printf '%s\n' "$defaults" | sed -n '2p')"
+  log_default="$(printf '%s\n' "$defaults" | sed -n '3p')"
+  if [[ -z "$bin_default" || -z "$log_default" ]]; then
+    echo "Could not discover plan-log defaults for ${invocation_dir}." >&2
+    exit 1
+  fi
+
+  args=("log=${log_default}" "bin=${bin_default}")
+  if [[ -n "$features_default" ]]; then
+    args+=("features=${features_default}" "logfeatures=${features_default}")
+  fi
+  args+=("$@")
+  (cd "$invocation_dir" && just plan "${args[@]}")