checkpoint

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checkpoint.json

@@ -1,32 +1,36 @@
 {
-  "timestamp": "2026-03-20T23:25:01.443693Z",
-  "current_node": "plan",
+  "timestamp": "2026-03-20T23:25:05.024969Z",
+  "current_node": "implement",
   "completed_nodes": [
     "start",
-    "plan"
+    "plan",
+    "implement"
   ],
   "node_retries": {
+    "implement": 1,
     "start": 1,
     "plan": 1
   },
   "context_values": {
+    "internal.retry_count.implement": 1,
     "graph.goal": "https://github.com/fabro-sh/fabro/issues/126",
-    "outcome": "success",
+    "outcome": "fail",
     "thread.start.current_node": "plan",
     "response.plan": "The plan file is located at **`/home/daytona/workspace/plan.md`**.\n\nIt covers the 4 files that need modification across 4 implementation steps:\n\n1. **Add `rand` dependency** to `fabro-agent/Cargo.toml` (workspace dep already exists)\n2. **Replace UUID generation** with `format!(\"{:08x}\", rand::random::<u32>())` in `subagent.rs`\n3. **Remove 5 `short_id` truncation lines** in `fabro-agent/src/cli.rs`, using `agent_id` directly\n4. **Remove 2 `short_id` truncation lines** in `fabro-cli/src/commands/run_progress.rs`, using `agent_id` directly\n\nNo new tests or files are needed — existing tests don't depend on UUID format.",
-    "failure_signature": "",
+    "failure_signature": "implement|deterministic|failed to parse child pipeline: parse error: failed to read ../implement/workflow.fabro: no such file or directory (os error <n>)",
     "internal.retry_count.start": 1,
-    "current.preamble": "Goal: https://github.com/fabro-sh/fabro/issues/126\n",
-    "internal.thread_id": "start",
+    "current.preamble": "Goal: https://github.com/fabro-sh/fabro/issues/126\nRun ID: 01KM6RYWXA9TZ4GFKQT99NF7A7\nPipeline progress: 1 of 2 stages completed\n\n## Stage: plan\n- Status: success\n- Handler: agent\n- Model: claude-opus-4-6\n- Tokens: 15.4k in / 2.7k out\n- Files touched: /home/daytona/workspace/plan.md\n- Response:\n  > The plan file is located at **`/home/daytona/workspace/plan.md`**.\n  > \n  > It covers the 4 files that need modification across 4 implementation steps:\n  > \n  > 1. **Add `rand` dependency** to `fabro-agent/Cargo.toml` (workspace dep already exists)\n  > 2. **Replace UUID generation** with `format!(\"{:08x}\", rand::random::<u32>())` in `subagent.rs`\n  > 3. **Remove 5 `short_id` truncation lines** in `fabro-agent/src/cli.rs`, using `agent_id` directly\n  > 4. **Remove 2 `short_id` truncation lines** in `fabro-cli/src/commands/run_progress.rs`, using `agent_id` directly\n  > \n  > No new tests or files are needed — existing tests don't depend on UUID format.\n",
+    "internal.thread_id": "plan",
+    "thread.plan.current_node": "implement",
     "internal.node_visit_count": 1,
-    "internal.fidelity": "compact",
+    "internal.fidelity": "summary:high",
     "graph.model_stylesheet": "\n            * { model: claude-opus-4-6; }\n        ",
     "internal.retry_count.plan": 1,
-    "failure_class": "",
+    "failure_class": "deterministic",
     "graph.rankdir": "LR",
     "internal.run_id": "01KM6RYWXA9TZ4GFKQT99NF7A7",
     "last_stage": "plan",
-    "current_node": "plan",
+    "current_node": "implement",
     "last_response": "The plan file is located at **`/home/daytona/workspace/plan.md`**.\n\nIt covers the 4 files that need modification across 4 implementation steps:\n\n1. **Add `rand` dependency** to `fabro-agent/Cargo.toml"
   },
   "logs": [],
@@ -53,14 +57,26 @@
       ],
       "duration_ms": 95761
     },
+    "implement": {
+      "status": "fail",
+      "failure": {
+        "message": "Failed to parse child pipeline: Parse error: Failed to read ../implement/workflow.fabro: No such file or directory (os error 2)",
+        "failure_class": "deterministic"
+      },
+      "duration_ms": 0
+    },
     "start": {
       "status": "success",
       "duration_ms": 0
     }
   },
-  "next_node_id": "implement",
+  "next_node_id": "exit",
+  "loop_failure_signatures": {
+    "implement|deterministic|failed to parse child pipeline: parse error: failed to read ../implement/workflow.fabro: no such file or directory (os error <n>)": 1
+  },
   "node_visits": {
     "start": 1,
-    "plan": 1
+    "plan": 1,
+    "implement": 1
   }
 }

nodes/implement/status.json

@@ -0,0 +1,6 @@
+{
+  "status": "fail",
+  "notes": null,
+  "failure_reason": "Failed to parse child pipeline: Parse error: Failed to read ../implement/workflow.fabro: No such file or directory (os error 2)",
+  "timestamp": "2026-03-20T23:25:05.024719+00:00"
+}

nodes/plan/diff.patch

@@ -0,0 +1,80 @@
+diff --git a/plan.md b/plan.md
+new file mode 100644
+index 00000000..ca795485
+--- /dev/null
++++ b/plan.md
+@@ -0,0 +1,74 @@
++# Plan: Use short hex IDs for subagents instead of UUIDs
++
++## Issue Summary
++
++GitHub Issue #126: Subagent IDs are currently full UUID v4 strings (36 chars, e.g. `550e8400-e29b-41d4-a716-446655440000`). These appear in CLI output and must be passed back by the LLM to tools like `send_input`, `wait`, and `close_agent`. A shorter, random 8-character hex string (e.g. `a3f1b20c`) is easier to read and less error-prone. The codebase already truncates agent IDs to 8 chars in multiple display locations — this change makes the canonical ID match what's already shown.
++
++## Files to Modify
++
++1. **`lib/crates/fabro-agent/Cargo.toml`** — Add `rand` dependency (already a workspace dep).
++2. **`lib/crates/fabro-agent/src/subagent.rs`** — Replace UUID generation with 8-char hex.
++3. **`lib/crates/fabro-agent/src/cli.rs`** — Remove 5 instances of `short_id` truncation; use `agent_id` directly.
++4. **`lib/crates/fabro-cli/src/commands/run_progress.rs`** — Remove 2 instances of `short_id` truncation; use `agent_id` directly.
++
++No files need to be created.
++
++## Step-by-step Implementation
++
++### Step 1: Add `rand` to `fabro-agent` dependencies
++
++In `lib/crates/fabro-agent/Cargo.toml`, add `rand.workspace = true` to `[dependencies]`. The `rand = "0.8"` workspace dependency already exists in the root `Cargo.toml`.
++
++Note: Do **not** remove `uuid` — it is still used for session IDs in `session.rs:58`.
++
++### Step 2: Replace UUID with random hex in `subagent.rs`
++
++In `lib/crates/fabro-agent/src/subagent.rs`, line 67, change:
++
++```rust
++let agent_id = uuid::Uuid::new_v4().to_string();
++```
++
++to:
++
++```rust
++let agent_id = format!("{:08x}", rand::random::<u32>());
++```
++
++This generates an 8-character lowercase hex string from a random `u32` (~4 billion possible values, effectively collision-free within a session).
++
++### Step 3: Remove `short_id` truncation in `cli.rs`
++
++In `lib/crates/fabro-agent/src/cli.rs`, there are 5 occurrences of `let short_id = &agent_id[..8.min(agent_id.len())];` (lines 542, 561, 574, 583, 596). Since the agent ID is now exactly 8 chars, these truncation lines are redundant. For each occurrence:
++
++- Remove the `let short_id = ...` line.
++- Replace all uses of `short_id` with `agent_id` in the surrounding format strings.
++
++The 5 locations are inside match arms for:
++1. `AgentEvent::SubAgentSpawned` (line 542)
++2. `AgentEvent::SubAgentCompleted` (line 561)
++3. `AgentEvent::SubAgentFailed` (line 574)
++4. `AgentEvent::SubAgentClosed` (line 583)
++5. `AgentEvent::SubAgentEvent` (line 596, inside `if verbose` guard)
++
++### Step 4: Remove `short_id` truncation in `run_progress.rs`
++
++In `lib/crates/fabro-cli/src/commands/run_progress.rs`, there are 2 occurrences of `let short_id = &agent_id[..agent_id.len().min(8)];` (lines 1416, 1432). For each:
++
++- Remove the `let short_id = ...` line.
++- Replace `short_id` with `agent_id` in the surrounding format strings.
++
++The 2 locations are inside match arms for:
++1. `AgentEvent::SubAgentSpawned` (line 1416)
++2. `AgentEvent::SubAgentCompleted` (line 1432)
++
++## Verification / Test Cases
++
++No new tests are needed. Existing tests use hardcoded IDs (like `"sa-1"`, `"nonexistent-id"`, `"x"`) and don't depend on the UUID format. The spawn test (`spawn_creates_agent_and_returns_id`) asserts the ID is non-empty, which still passes.
++
++Run these commands to verify:
++
++1. `cargo test -p fabro-agent` — all subagent tests pass
++2. `cargo test -p fabro-cli` — run_progress tests pass
++3. `cargo clippy --workspace -- -D warnings` — no warnings
++4. `cargo build --workspace` — clean build