diff --git a/AGENTS.md b/AGENTS.md
index 64727e1e0..0898a6c33 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -107,6 +107,7 @@
 - Bug investigations: read source code of relevant npm dependencies and all related local code before concluding; aim for high-confidence root cause.
 - Code style: add brief comments for tricky logic; keep files under ~500 LOC when feasible (split/refactor as needed).
 - Tool schema guardrails (google-antigravity): avoid `Type.Union` in tool input schemas; no `anyOf`/`oneOf`/`allOf`. Use `stringEnum`/`optionalStringEnum` (Type.Unsafe enum) for string lists, and `Type.Optional(...)` instead of `... | null`. Keep top-level tool schema as `type: "object"` with `properties`.
+- Tool schema guardrails: avoid raw `format` property names in tool schemas; some validators treat `format` as a reserved keyword and reject the schema.
 - When asked to open a “session” file, open the Pi session logs under `~/.clawdbot/agents/main/sessions/*.jsonl` (newest unless a specific ID is given), not the default `sessions.json`. If logs are needed from another machine, SSH via Tailscale and read the same path there.
 - Menubar dimming + restart flow mirrors Trimmy: use `scripts/restart-mac.sh` (kills all Clawdbot variants, runs `swift build`, packages, relaunches). Icon dimming depends on MenuBarExtraAccess wiring in AppMain; keep `appearsDisabled` updates intact when touching the status item.
 - Do not rebuild the macOS app over SSH; rebuilds must be run directly on the Mac.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4389fe1ce..f86c534db 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -51,6 +51,8 @@
 
 ### Fixes
 - WhatsApp: default response prefix only for self-chat, using identity name when set.
+- Auth: merge main auth profiles into per-agent stores for sub-agents and document inheritance. (#1013) — thanks @marcmarg.
+- Agents: avoid JSON Schema `format` collisions in tool params by renaming snapshot format fields. (#1013) — thanks @marcmarg.
 - Fix: make `clawdbot update` auto-update global installs when installed via a package manager.
 - Fix: list model picker entries as provider/model pairs for explicit selection. (#970) — thanks @mcinteerj.
 - Fix: align OpenAI image-gen defaults with DALL-E 3 standard quality and document output formats. (#880) — thanks @mkbehr.
diff --git a/src/agents/pi-tools.create-clawdbot-coding-tools.adds-claude-style-aliases-schemas-without-dropping-a.test.ts b/src/agents/pi-tools.create-clawdbot-coding-tools.adds-claude-style-aliases-schemas-without-dropping-a.test.ts
index 3d593ba0a..d2791a0af 100644
--- a/src/agents/pi-tools.create-clawdbot-coding-tools.adds-claude-style-aliases-schemas-without-dropping-a.test.ts
+++ b/src/agents/pi-tools.create-clawdbot-coding-tools.adds-claude-style-aliases-schemas-without-dropping-a.test.ts
@@ -129,16 +129,16 @@ describe("createClawdbotCodingTools", () => {
     expect(Array.isArray(action?.enum)).toBe(true);
     expect(action?.enum).toContain("act");
 
-    const format = parameters.properties?.format as
+    const snapshotFormat = parameters.properties?.snapshotFormat as
       | {
           type?: unknown;
           enum?: unknown[];
           anyOf?: unknown[];
         }
       | undefined;
-    expect(format?.type).toBe("string");
-    expect(format?.anyOf).toBeUndefined();
-    expect(format?.enum).toEqual(["aria", "ai"]);
+    expect(snapshotFormat?.type).toBe("string");
+    expect(snapshotFormat?.anyOf).toBeUndefined();
+    expect(snapshotFormat?.enum).toEqual(["aria", "ai"]);
   });
   it("inlines local $ref before removing unsupported keywords", () => {
     const cleaned = __testing.cleanToolSchemaForGemini({
diff --git a/src/agents/tools/browser-tool.schema.ts b/src/agents/tools/browser-tool.schema.ts
index 5acad1688..a04b7f8d0 100644
--- a/src/agents/tools/browser-tool.schema.ts
+++ b/src/agents/tools/browser-tool.schema.ts
@@ -91,7 +91,7 @@ export const BrowserToolSchema = Type.Object({
   limit: Type.Optional(Type.Number()),
   maxChars: Type.Optional(Type.Number()),
   mode: optionalStringEnum(BROWSER_SNAPSHOT_MODES),
-  format: optionalStringEnum(BROWSER_SNAPSHOT_FORMATS),
+  snapshotFormat: optionalStringEnum(BROWSER_SNAPSHOT_FORMATS),
   refs: optionalStringEnum(BROWSER_SNAPSHOT_REFS),
   interactive: Type.Optional(Type.Boolean()),
   compact: Type.Optional(Type.Boolean()),
diff --git a/src/agents/tools/browser-tool.ts b/src/agents/tools/browser-tool.ts
index 9ed5ddd3b..37e71db7d 100644
--- a/src/agents/tools/browser-tool.ts
+++ b/src/agents/tools/browser-tool.ts
@@ -191,8 +191,8 @@ export function createBrowserTool(opts?: {
         }
         case "snapshot": {
           const format =
-            params.format === "ai" || params.format === "aria"
-              ? (params.format as "ai" | "aria")
+            params.snapshotFormat === "ai" || params.snapshotFormat === "aria"
+              ? (params.snapshotFormat as "ai" | "aria")
               : "ai";
           const mode = params.mode === "efficient" ? "efficient" : undefined;
           const labels = typeof params.labels === "boolean" ? params.labels : undefined;
diff --git a/src/agents/tools/canvas-tool.ts b/src/agents/tools/canvas-tool.ts
index 247d69fb0..092d00ab4 100644
--- a/src/agents/tools/canvas-tool.ts
+++ b/src/agents/tools/canvas-tool.ts
@@ -40,7 +40,7 @@ const CanvasToolSchema = Type.Object({
   // eval
   javaScript: Type.Optional(Type.String()),
   // snapshot
-  format: optionalStringEnum(CANVAS_SNAPSHOT_FORMATS),
+  outputFormat: optionalStringEnum(CANVAS_SNAPSHOT_FORMATS),
   maxWidth: Type.Optional(Type.Number()),
   quality: Type.Optional(Type.Number()),
   delayMs: Type.Optional(Type.Number()),
@@ -127,7 +127,7 @@ export function createCanvasTool(): AnyAgentTool {
           return jsonResult({ ok: true });
         }
         case "snapshot": {
-          const formatRaw = typeof params.format === "string" ? params.format.toLowerCase() : "png";
+          const formatRaw = typeof params.outputFormat === "string" ? params.outputFormat.toLowerCase() : "png";
           const format = formatRaw === "jpg" || formatRaw === "jpeg" ? "jpeg" : "png";
           const maxWidth =
             typeof params.maxWidth === "number" && Number.isFinite(params.maxWidth)