docs: clarify web_search freshness support

CHANGELOG.md

@@ -89,6 +89,7 @@ Docs: https://docs.openclaw.ai
 - Cron: add regression coverage for announce-mode isolated jobs so runs that already report `delivered: true` do not enqueue duplicate main-session relays, including delivery configs where `mode` is omitted and defaults to announce. (#15737) Thanks @brandonwise.
 - Cron: honor `deleteAfterRun` in isolated announce delivery by mapping it to subagent announce cleanup mode, so cron run sessions configured for deletion are removed after completion. (#15368) Thanks @arosstale.
 - Web tools/web_fetch: prefer `text/markdown` responses for Cloudflare Markdown for Agents, add `cf-markdown` extraction for markdown bodies, and redact fetched URLs in `x-markdown-tokens` debug logs to avoid leaking raw paths/query params. (#15376) Thanks @Yaxuan42.
+- Tools/web_search: support `freshness` for the Perplexity provider by mapping `pd`/`pw`/`pm`/`py` to Perplexity `search_recency_filter` values and including freshness in the Perplexity cache key. (#15343) Thanks @echoVic.
 - Clawdock: avoid Zsh readonly variable collisions in helper scripts. (#15501) Thanks @nkelner.
 - Memory: switch default local embedding model to the QAT `embeddinggemma-300m-qat-Q8_0` variant for better quality at the same footprint. (#15429) Thanks @azade-c.
 - Docs/Mermaid: remove hardcoded Mermaid init theme blocks from four docs diagrams so dark mode inherits readable theme defaults. (#15157) Thanks @heytulsiprasad.

docs/tools/web.md

@@ -175,7 +175,9 @@ Search the web using your configured provider.
 - `country` (optional): 2-letter country code for region-specific results (e.g., "DE", "US", "ALL"). If omitted, Brave chooses its default region.
 - `search_lang` (optional): ISO language code for search results (e.g., "de", "en", "fr")
 - `ui_lang` (optional): ISO language code for UI elements
-- `freshness` (optional, Brave only): filter by discovery time (`pd`, `pw`, `pm`, `py`, or `YYYY-MM-DDtoYYYY-MM-DD`)
+- `freshness` (optional): filter by discovery time
+  - Brave: `pd`, `pw`, `pm`, `py`, or `YYYY-MM-DDtoYYYY-MM-DD`
+  - Perplexity: `pd`, `pw`, `pm`, `py`
 
 **Examples:**
 

src/agents/tools/web-search.ts

@@ -64,7 +64,7 @@ const WebSearchSchema = Type.Object({
   freshness: Type.Optional(
     Type.String({
       description:
-        "Filter results by discovery time (Brave only). Values: 'pd' (past 24h), 'pw' (past week), 'pm' (past month), 'py' (past year), or date range 'YYYY-MM-DDtoYYYY-MM-DD'.",
+        "Filter results by discovery time. Brave supports 'pd', 'pw', 'pm', 'py', and date range 'YYYY-MM-DDtoYYYY-MM-DD'. Perplexity supports 'pd', 'pw', 'pm', and 'py'.",
     }),
   ),
 });