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minglong51 merged 1 commit into from
Aug 9, 2026
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docs(design): document policy.py, the fail-closed resource limits #13

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27 changes: 26 additions & 1 deletion docs/design/LLD.md
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Expand Up @@ -475,7 +475,32 @@ output; on durable failure print `resume with: --store ... --resume <id>`

## Config / Env Surface

Environment variables (all read in `llm.py`):
### `policy.py` — fail-closed resource limits

Module-level constants, no env override, imported by `ir.py`, `parser.py`,
`runtime.py` and `server.py`. Its docstring is the scope statement worth keeping:
these are **conservative defaults for the single-node runtime, not
distributed-runtime service-level guarantees** — a workload that needs more should
split programs or put an authenticated admission layer in front of the server,
rather than raise the numbers.

| Constant | Value | Bounds |
|---|---|---|
| `MAX_SOURCE_BYTES` | 256 KiB | `.thread` source accepted by the parser |
| `MAX_IR_BYTES` | 1 MiB | serialized IR accepted by `load_ir_bytes` |
| `MAX_STRING_CHARS` | 64 Ki | any single string value |
| `MAX_AGENT_ITERS` | 32 | agent-step loop ceiling |
| `MAX_REGEX_PATTERN_CHARS` / `MAX_REGEX_INPUT_CHARS` | 512 / 64 Ki | regex surface |
| `REGEX_TIMEOUT_SECONDS` | 1.0 | per-match wall clock — the ReDoS floor |
| `MAX_REQUEST_BYTES` | 1 MiB | HTTP body |
| `MAX_INPUTS` / `MAX_INPUT_KEY_CHARS` / `MAX_INPUT_VALUE_CHARS` | 128 / 128 / 64 Ki | run inputs |
| `DEFAULT_MAX_PENDING_RUNS` / `DEFAULT_MAX_RETAINED_RUNS` | 1 000 / 10 000 | queue + retention |
| `DEFAULT_LIST_LIMIT` / `MAX_LIST_LIMIT` | 100 / 1 000 | list pagination |

Fail-closed means a value over the limit is rejected, never truncated — a silently
clipped program would execute something the author did not write.

### Environment variables (all read in `llm.py`)

- `ANTHROPIC_API_KEY` — `AnthropicClient` when no `api_key` passed
(`llm.py:143`).
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