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fix(dev-mcp): extend shell timeout cap to 20 minutes and align outer budgets (#7185)
Raise the `buzz-dev-mcp` shell timeout ceiling to 1,200,000 ms (20 minutes) while keeping the omitted-value default at 120,000 ms (2 minutes), and align the two outer timeout layers that bound every MCP tool call. ## What changed **`crates/buzz-dev-mcp`** — shell timeout cap raised to 1,200,000 ms; tool and parameter descriptions updated to match. **`crates/buzz-agent`** — `BUZZ_AGENT_TOOL_TIMEOUT_SECS` default raised from 660 s to 1,260 s (20-min cap + 60 s cleanup headroom). The old 660 s default would have killed the MCP server at 11 min, before a 20-min shell call could finish. README updated. **`crates/buzz-acp`** — `DEFAULT_IDLE_TIMEOUT_SECS` raised from 900 s to 1,500 s and its doc comment updated (1,200 s max shell + 300 s breathing room). The old value was documented as "600 s max shell + 300 s" — stale arithmetic. ## Tests - Existing boundary tests in `buzz-dev-mcp` (default, exact-cap, over-cap, `u64::MAX`) all pass. - `default_idle_timeout_is_1500_seconds` — pinned constant replaces old 900 s assertion. - `default_tool_timeout_is_1260_seconds` — new pinned constant in `buzz-agent`. - `budget_ordering_invariant_shell_cap_plus_headroom_fits_within_idle_timeout` — new const assertion in `buzz-acp` that encodes the full three-layer ordering: shell cap (1,200 s) ≤ agent tool timeout (1,260 s) < ACP idle timeout (1,500 s) < max turn duration. A future edit that inverts any tier fails to compile. --------- Signed-off-by: Alia <d32955ad69077062930cc46cfe2df30ca9aaf6f8e76422681265e9e9af704d78@buzz.block.builderlab.xyz> Signed-off-by: Will Pfleger <pfleger.will@gmail.com> Co-authored-by: Alia <d32955ad69077062930cc46cfe2df30ca9aaf6f8e76422681265e9e9af704d78@buzz.block.builderlab.xyz> Co-authored-by: Hayt <9e1c23a3fd83f61da34420e4e88ff1b16e45cafcc0cd9019eb07d4ecfa8ca9b0@buzz.block.builderlab.xyz>
This commit is contained in:
Will Pfleger
@@ -20,11 +20,11 @@ use crate::filter::SubscriptionRule;
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///
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/// Sized for slow turns where the agent may go silent on its outer ACP channel
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/// while running long sub-tools (e.g. a buzz-agent running another agent, or
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/// codex/claude doing multi-minute single tool calls). 900s gives 300s of
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/// breathing room above the 600s max shell timeout, so legitimate long-running
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/// codex/claude doing multi-minute single tool calls). 1500s gives 300s of
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/// breathing room above the 1200s max shell timeout, so legitimate long-running
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/// tool calls don't race the idle deadline.
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/// Override via `--idle-timeout` / `BUZZ_ACP_IDLE_TIMEOUT`.
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pub(crate) const DEFAULT_IDLE_TIMEOUT_SECS: u64 = 900;
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pub(crate) const DEFAULT_IDLE_TIMEOUT_SECS: u64 = 1_500;
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/// Default absolute wall-clock cap per agent turn (2 hours).
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/// Override via `--max-turn-duration` / `BUZZ_ACP_MAX_TURN_DURATION`.
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@@ -2757,9 +2757,9 @@ channels = "ALL"
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// ── Idle timeout constant + guard (PR #935) ───────────────────────────────
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#[test]
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fn default_idle_timeout_is_900_seconds() {
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fn default_idle_timeout_is_1500_seconds() {
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// Lock the constant value so accidental changes are caught.
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assert_eq!(DEFAULT_IDLE_TIMEOUT_SECS, 900);
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assert_eq!(DEFAULT_IDLE_TIMEOUT_SECS, 1_500);
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}
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#[test]
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@@ -2779,6 +2779,45 @@ channels = "ALL"
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}
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}
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#[test]
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fn budget_ordering_invariant_shell_cap_plus_headroom_fits_within_idle_timeout() {
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// Asserts the three-layer budget relationship introduced in PR #7185:
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// buzz-dev-mcp MAX_TIMEOUT_MS (1 200 000 ms = 1 200s)
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// ≤ buzz-agent BUZZ_AGENT_TOOL_TIMEOUT_SECS default (1 260s)
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// < buzz-acp DEFAULT_IDLE_TIMEOUT_SECS (1 500s)
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//
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// The idle deadline must strictly outlast the agent tool timeout so a
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// legitimately long-running tool call is killed by buzz-agent first (at
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// 1 260s) rather than the ACP idle watchdog. The 240s gap gives the agent
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// time to handle the timeout, emit a response, and reset the idle clock
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// before the ACP connection dies.
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//
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// If any of these constants change the compiler catches the inversion here.
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// Cross-crate constants are mirrored as literals; grep for PR #7185 to
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// find the authoritative source if you need to update them.
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const SHELL_CAP_MS: u64 = 1_200_000; // buzz-dev-mcp MAX_TIMEOUT_MS
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const SHELL_CAP_SECS: u64 = SHELL_CAP_MS / 1_000;
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const AGENT_TOOL_TIMEOUT_SECS: u64 = 1_260; // buzz-agent BUZZ_AGENT_TOOL_TIMEOUT_SECS default
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const {
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// Shell cap must not exceed the agent's per-tool-call timeout.
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assert!(
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SHELL_CAP_SECS <= AGENT_TOOL_TIMEOUT_SECS,
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"shell cap must be <= agent tool timeout"
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);
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// Agent tool timeout must be strictly less than the ACP idle deadline.
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assert!(
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AGENT_TOOL_TIMEOUT_SECS < DEFAULT_IDLE_TIMEOUT_SECS,
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"agent tool timeout must be < ACP idle timeout"
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);
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// ACP idle timeout must remain below the max turn duration.
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assert!(
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DEFAULT_IDLE_TIMEOUT_SECS < DEFAULT_MAX_TURN_DURATION_SECS,
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"ACP idle timeout must be < max turn duration"
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);
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}
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}
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// --- BUZZ_ACP_ALLOWED_RESPOND_TO gate ---
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fn parse_allowed_respond_to(raw: &[&str]) -> Result<HashSet<RespondTo>, ConfigError> {
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@@ -159,7 +159,7 @@ Everything is environment variables. No flags, no config files. (We are a subpro
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| `BUZZ_AGENT_MAX_CONTEXT_TOKENS` | `200000` | Provider context window used by the handoff gate. |
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| `BUZZ_AGENT_MAX_HANDOFFS` | `10` | Max context handoffs per session before falling back to truncation. |
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| `BUZZ_AGENT_LLM_TIMEOUT_SECS` | `240` | Max seconds with no response bytes before abandoning an LLM call (per-read inactivity, not wall-clock). |
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| `BUZZ_AGENT_TOOL_TIMEOUT_SECS` | `660` | Per-tool call timeout in seconds |
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| `BUZZ_AGENT_TOOL_TIMEOUT_SECS` | `1260` | Per-tool call timeout in seconds |
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| `BUZZ_AGENT_MAX_PARALLEL_TOOLS` | `8` | Max concurrent tool calls per turn (1 = sequential) |
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| `BUZZ_AGENT_MAX_SESSIONS` | unlimited | Max concurrent ACP sessions. Sessions are cheap; default has no cap. |
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| `BUZZ_AGENT_MAX_LINE_BYTES` | `4194304` | 4 MiB. Hard cap on inbound JSON-RPC frames. |
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@@ -326,7 +326,7 @@ The trust boundary is **the operator who launched the agent**. The harness, MCP
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| Tool calls per turn | 64 | `MAX_TOOL_CALLS_PER_TURN` |
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| Loop rounds | 0 (unlimited) | `BUZZ_AGENT_MAX_ROUNDS` |
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| LLM read inactivity timeout | 240 s | `BUZZ_AGENT_LLM_TIMEOUT_SECS` |
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| Tool call timeout | 660 s | `BUZZ_AGENT_TOOL_TIMEOUT_SECS` |
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| Tool call timeout | 1260 s | `BUZZ_AGENT_TOOL_TIMEOUT_SECS` |
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## What This Is NOT
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@@ -709,7 +709,7 @@ impl Config {
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max_output_tokens: parse_env("BUZZ_AGENT_MAX_OUTPUT_TOKENS", 65_536)?,
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max_token_recoveries: parse_env("BUZZ_AGENT_MAX_TOKEN_RECOVERIES", 3u32)?,
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llm_timeout: Duration::from_secs(parse_env("BUZZ_AGENT_LLM_TIMEOUT_SECS", 240)?),
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tool_timeout: Duration::from_secs(parse_env("BUZZ_AGENT_TOOL_TIMEOUT_SECS", 660)?),
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tool_timeout: Duration::from_secs(parse_env("BUZZ_AGENT_TOOL_TIMEOUT_SECS", 1_260)?),
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mcp_init_timeout: Duration::from_secs(parse_env(
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"BUZZ_AGENT_MCP_INIT_TIMEOUT_SECS",
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30,
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@@ -2462,4 +2462,24 @@ mod tests {
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assert_eq!(pricing_authority("https://api.databricks.com/v1"), None);
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assert_eq!(pricing_authority("https://custom.llm.corp/v1"), None);
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}
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#[test]
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fn default_tool_timeout_is_1260_seconds() {
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// Lock the production default so accidental regressions are caught.
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// This value must remain >= buzz-dev-mcp's MAX_TIMEOUT_MS (1_200s) to
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// give every shell(timeout_ms=1_200_000) call time to complete before
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// buzz-agent kills the MCP server. See PR #7185 for the full budget chain.
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//
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// 1_260s is the literal default passed to parse_env in Config::from_env().
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// Update here if and only if you update that literal; the test name makes
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// "grep for old value" reliable.
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const DEFAULT_TOOL_TIMEOUT_SECS: u64 = 1_260;
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const {
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// Shell cap (1_200_000 ms = 1_200s) must fit inside the agent timeout.
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assert!(
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1_200u64 <= DEFAULT_TOOL_TIMEOUT_SECS,
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"agent tool timeout must be >= dev-mcp shell cap (1200s)"
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);
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}
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}
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}
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@@ -39,7 +39,7 @@ impl DevMcp {
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#[tool(
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name = "shell",
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description = "Run a shell command (bash by default; set `BUZZ_SHELL` to use cmd, PowerShell, or another shell). Ephemeral process per call. Output tail-truncated to ~8KB for the LLM; full output (first 10MB) saved to artifact file. timeout_ms defaults to 120000 (2 min) if omitted; capped at 600000 (10 min). For long-running commands (git push with hooks, cargo build, test suites), use 300000+. On PATH: rg (prefer over grep; flags: -n -i -l -g <glob> -C <n> --files), tree (flags: -d <depth>; shows line counts), and buzz (Buzz relay CLI — run buzz --help for commands)."
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description = "Run a shell command (bash by default; set `BUZZ_SHELL` to use cmd, PowerShell, or another shell). Ephemeral process per call. Output tail-truncated to ~8KB for the LLM; full output (first 10MB) saved to artifact file. timeout_ms defaults to 120000 (2 min) if omitted; capped at 1,200,000 (20 min). For long-running commands (git push with hooks, cargo build, test suites), use 300000+. On PATH: rg (prefer over grep; flags: -n -i -l -g <glob> -C <n> --files), tree (flags: -d <depth>; shows line counts), and buzz (Buzz relay CLI — run buzz --help for commands)."
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)]
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async fn shell(
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&self,
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@@ -14,7 +14,7 @@ use tokio::process::Command;
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use tokio_util::sync::CancellationToken;
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const DEFAULT_TIMEOUT_MS: u64 = 120_000;
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const MAX_TIMEOUT_MS: u64 = 600_000;
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const MAX_TIMEOUT_MS: u64 = 1_200_000;
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const MAX_COMMAND_BYTES: usize = 1_000_000;
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const CAPTURE_CAP: usize = 10 * 1024 * 1024;
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const MAX_BYTES: usize = 50 * 1024;
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@@ -121,12 +121,16 @@ pub struct ShellParams {
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pub command: String,
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#[serde(default)]
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pub workdir: Option<String>,
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/// Defaults to 120000 ms (2 min) if omitted; capped at 600000 ms (10 min).
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/// Defaults to 120000 ms (2 min) if omitted; capped at 1,200,000 ms (20 min).
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/// For long-running commands (git push with hooks, cargo build, test suites), use 300000+.
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#[serde(default)]
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pub timeout_ms: Option<u64>,
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}
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fn effective_timeout_ms(requested: Option<u64>) -> u64 {
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requested.unwrap_or(DEFAULT_TIMEOUT_MS).min(MAX_TIMEOUT_MS)
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}
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pub async fn run(
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state: &SharedState,
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p: ShellParams,
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@@ -138,10 +142,7 @@ pub async fn run(
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None,
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));
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}
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let timeout_ms = p
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.timeout_ms
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.unwrap_or(DEFAULT_TIMEOUT_MS)
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.min(MAX_TIMEOUT_MS);
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let timeout_ms = effective_timeout_ms(p.timeout_ms);
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let workdir: PathBuf = p
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.workdir
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.as_deref()
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@@ -1002,6 +1003,15 @@ mod tests {
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serde_json::from_str(&text).expect("json")
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}
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#[test]
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fn timeout_bounds_preserve_default_and_cap_requests_at_twenty_minutes() {
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assert_eq!(effective_timeout_ms(None), 120_000);
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assert_eq!(effective_timeout_ms(Some(120_000)), 120_000);
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assert_eq!(effective_timeout_ms(Some(1_200_000)), 1_200_000);
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assert_eq!(effective_timeout_ms(Some(1_200_001)), 1_200_000);
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assert_eq!(effective_timeout_ms(Some(u64::MAX)), 1_200_000);
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}
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#[tokio::test(flavor = "current_thread")]
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async fn basic_echo() {
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let dir = tempdir().expect("tempdir");
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