diff --git a/CHANGELOG.md b/CHANGELOG.md
index 871a2c9be..d0b0e692b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -179,6 +179,8 @@ Docs: https://docs.openclaw.ai
 - Gateway/config errors: surface up to three validation issues in top-level `config.set`, `config.patch`, and `config.apply` error messages while preserving structured issue details. (#42664) Thanks @huntharo.
 - Hooks/plugin context parity followup: pass `trigger` and `channelId` through embedded `llm_input`, `agent_end`, and `llm_output` hook contexts so plugins receive the same agent metadata across hook phases. (#42362) Thanks @zhoulf1006.
 - Status/context windows: normalize provider-qualified override cache keys so `/status` resolves the active provider's configured context window even when `models.providers` keys use mixed case or surrounding whitespace. (#36389) Thanks @haoruilee.
+- ACP/main session aliases: canonicalize `main` before ACP session lookup so restarted ACP main sessions rehydrate instead of failing closed with `Session is not ACP-enabled: main`. (#43285, fixes #25692)
+- Agents/embedded runner: recover canonical allowlisted tool names from malformed `toolCallId` and malformed non-blank tool-name variants before dispatch, while failing closed on ambiguous matches. (#34485) thanks @yuweuii.
 
 ## 2026.3.8
 
diff --git a/changelog/fragments/toolcall-id-malformed-name-inference.md b/changelog/fragments/toolcall-id-malformed-name-inference.md
new file mode 100644
index 000000000..6af2b986f
--- /dev/null
+++ b/changelog/fragments/toolcall-id-malformed-name-inference.md
@@ -0,0 +1 @@
+- runner: infer canonical tool names from malformed `toolCallId` variants (e.g. `functionsread3`, `functionswrite4`) when allowlist is present, preventing `Tool not found` regressions in strict routers.
diff --git a/src/agents/pi-embedded-runner/run/attempt.test.ts b/src/agents/pi-embedded-runner/run/attempt.test.ts
index 020372122..ef88e04ef 100644
--- a/src/agents/pi-embedded-runner/run/attempt.test.ts
+++ b/src/agents/pi-embedded-runner/run/attempt.test.ts
@@ -358,6 +358,279 @@ describe("wrapStreamFnTrimToolCallNames", () => {
     expect(result).toBe(finalMessage);
   });
 
+  it("infers tool names from malformed toolCallId variants when allowlist is present", async () => {
+    const partialToolCall = { type: "toolCall", id: "functions.read:0", name: "" };
+    const finalToolCallA = { type: "toolCall", id: "functionsread3", name: "" };
+    const finalToolCallB: { type: string; id: string; name?: string } = {
+      type: "toolCall",
+      id: "functionswrite4",
+    };
+    const finalToolCallC = { type: "functionCall", id: "functions.exec2", name: "" };
+    const event = {
+      type: "toolcall_delta",
+      partial: { role: "assistant", content: [partialToolCall] },
+    };
+    const finalMessage = {
+      role: "assistant",
+      content: [finalToolCallA, finalToolCallB, finalToolCallC],
+    };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [event],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["read", "write", "exec"]));
+    for await (const _item of stream) {
+      // drain
+    }
+    const result = await stream.result();
+
+    expect(partialToolCall.name).toBe("read");
+    expect(finalToolCallA.name).toBe("read");
+    expect(finalToolCallB.name).toBe("write");
+    expect(finalToolCallC.name).toBe("exec");
+    expect(result).toBe(finalMessage);
+  });
+
+  it("does not infer names from malformed toolCallId when allowlist is absent", async () => {
+    const finalToolCall: { type: string; id: string; name?: string } = {
+      type: "toolCall",
+      id: "functionsread3",
+    };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn);
+    await stream.result();
+
+    expect(finalToolCall.name).toBeUndefined();
+  });
+
+  it("infers malformed non-blank tool names before dispatch", async () => {
+    const partialToolCall = { type: "toolCall", id: "functionsread3", name: "functionsread3" };
+    const finalToolCall = { type: "toolCall", id: "functionsread3", name: "functionsread3" };
+    const event = {
+      type: "toolcall_delta",
+      partial: { role: "assistant", content: [partialToolCall] },
+    };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [event],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["read", "write"]));
+    for await (const _item of stream) {
+      // drain
+    }
+    await stream.result();
+
+    expect(partialToolCall.name).toBe("read");
+    expect(finalToolCall.name).toBe("read");
+  });
+
+  it("recovers malformed non-blank names when id is missing", async () => {
+    const finalToolCall = { type: "toolCall", name: "functionsread3" };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["read", "write"]));
+    await stream.result();
+
+    expect(finalToolCall.name).toBe("read");
+  });
+
+  it("recovers canonical tool names from canonical ids when name is empty", async () => {
+    const finalToolCall = { type: "toolCall", id: "read", name: "" };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["read", "write"]));
+    await stream.result();
+
+    expect(finalToolCall.name).toBe("read");
+  });
+
+  it("recovers tool names from ids when name is whitespace-only", async () => {
+    const finalToolCall = { type: "toolCall", id: "functionswrite4", name: "   " };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["read", "write"]));
+    await stream.result();
+
+    expect(finalToolCall.name).toBe("write");
+  });
+
+  it("keeps blank names blank and assigns fallback ids when both name and id are blank", async () => {
+    const finalToolCall = { type: "toolCall", id: "", name: "" };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["read", "write"]));
+    await stream.result();
+
+    expect(finalToolCall.name).toBe("");
+    expect(finalToolCall.id).toBe("call_auto_1");
+  });
+
+  it("assigns fallback ids when both name and id are missing", async () => {
+    const finalToolCall: { type: string; name?: string; id?: string } = { type: "toolCall" };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["read", "write"]));
+    await stream.result();
+
+    expect(finalToolCall.name).toBeUndefined();
+    expect(finalToolCall.id).toBe("call_auto_1");
+  });
+
+  it("prefers explicit canonical names over conflicting canonical ids", async () => {
+    const finalToolCall = { type: "toolCall", id: "write", name: "read" };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["read", "write"]));
+    await stream.result();
+
+    expect(finalToolCall.name).toBe("read");
+    expect(finalToolCall.id).toBe("write");
+  });
+
+  it("prefers explicit trimmed canonical names over conflicting malformed ids", async () => {
+    const finalToolCall = { type: "toolCall", id: "functionswrite4", name: " read " };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["read", "write"]));
+    await stream.result();
+
+    expect(finalToolCall.name).toBe("read");
+  });
+
+  it("does not rewrite composite names that mention multiple tools", async () => {
+    const finalToolCall = { type: "toolCall", id: "functionsread3", name: "read write" };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["read", "write"]));
+    await stream.result();
+
+    expect(finalToolCall.name).toBe("read write");
+  });
+
+  it("fails closed for malformed non-blank names that are ambiguous", async () => {
+    const finalToolCall = { type: "toolCall", id: "functions.exec2", name: "functions.exec2" };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["exec", "exec2"]));
+    await stream.result();
+
+    expect(finalToolCall.name).toBe("functions.exec2");
+  });
+
+  it("matches malformed ids case-insensitively across common separators", async () => {
+    const finalToolCall = { type: "toolCall", id: "Functions.Read_7", name: "" };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["read", "write"]));
+    await stream.result();
+
+    expect(finalToolCall.name).toBe("read");
+  });
+  it("does not override explicit non-blank tool names with inferred ids", async () => {
+    const finalToolCall = { type: "toolCall", id: "functionswrite4", name: "someOtherTool" };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["read", "write"]));
+    await stream.result();
+
+    expect(finalToolCall.name).toBe("someOtherTool");
+  });
+
+  it("fails closed when malformed ids could map to multiple allowlisted tools", async () => {
+    const finalToolCall = { type: "toolCall", id: "functions.exec2", name: "" };
+    const finalMessage = { role: "assistant", content: [finalToolCall] };
+    const baseFn = vi.fn(() =>
+      createFakeStream({
+        events: [],
+        resultMessage: finalMessage,
+      }),
+    );
+
+    const stream = await invokeWrappedStream(baseFn, new Set(["exec", "exec2"]));
+    await stream.result();
+
+    expect(finalToolCall.name).toBe("");
+  });
   it("does not collapse whitespace-only tool names to empty strings", async () => {
     const partialToolCall = { type: "toolCall", name: "   " };
     const finalToolCall = { type: "toolCall", name: "\t  " };
diff --git a/src/agents/pi-embedded-runner/run/attempt.ts b/src/agents/pi-embedded-runner/run/attempt.ts
index ef36c6dea..a1a00992f 100644
--- a/src/agents/pi-embedded-runner/run/attempt.ts
+++ b/src/agents/pi-embedded-runner/run/attempt.ts
@@ -425,19 +425,71 @@ export function wrapOllamaCompatNumCtx(baseFn: StreamFn | undefined, numCtx: num
     });
 }
 
-function normalizeToolCallNameForDispatch(rawName: string, allowedToolNames?: Set<string>): string {
-  const trimmed = rawName.trim();
-  if (!trimmed) {
-    // Keep whitespace-only placeholders unchanged so they do not collapse to
-    // empty names (which can later surface as toolName="" loops).
+function resolveCaseInsensitiveAllowedToolName(
+  rawName: string,
+  allowedToolNames?: Set<string>,
+): string | null {
+  if (!allowedToolNames || allowedToolNames.size === 0) {
+    return null;
+  }
+  const folded = rawName.toLowerCase();
+  let caseInsensitiveMatch: string | null = null;
+  for (const name of allowedToolNames) {
+    if (name.toLowerCase() !== folded) {
+      continue;
+    }
+    if (caseInsensitiveMatch && caseInsensitiveMatch !== name) {
+      return null;
+    }
+    caseInsensitiveMatch = name;
+  }
+  return caseInsensitiveMatch;
+}
+
+function resolveExactAllowedToolName(
+  rawName: string,
+  allowedToolNames?: Set<string>,
+): string | null {
+  if (!allowedToolNames || allowedToolNames.size === 0) {
+    return null;
+  }
+  if (allowedToolNames.has(rawName)) {
     return rawName;
   }
-  if (!allowedToolNames || allowedToolNames.size === 0) {
-    return trimmed;
+  const normalized = normalizeToolName(rawName);
+  if (allowedToolNames.has(normalized)) {
+    return normalized;
+  }
+  return (
+    resolveCaseInsensitiveAllowedToolName(rawName, allowedToolNames) ??
+    resolveCaseInsensitiveAllowedToolName(normalized, allowedToolNames)
+  );
+}
+
+function buildStructuredToolNameCandidates(rawName: string): string[] {
+  const trimmed = rawName.trim();
+  if (!trimmed) {
+    return [];
   }
 
-  const candidateNames = new Set<string>([trimmed, normalizeToolName(trimmed)]);
+  const candidates: string[] = [];
+  const seen = new Set<string>();
+  const addCandidate = (value: string) => {
+    const candidate = value.trim();
+    if (!candidate || seen.has(candidate)) {
+      return;
+    }
+    seen.add(candidate);
+    candidates.push(candidate);
+  };
+
+  addCandidate(trimmed);
+  addCandidate(normalizeToolName(trimmed));
+
   const normalizedDelimiter = trimmed.replace(/\//g, ".");
+  addCandidate(normalizedDelimiter);
+  addCandidate(normalizeToolName(normalizedDelimiter));
+
   const segments = normalizedDelimiter
     .split(".")
     .map((segment) => segment.trim())
@@ -445,11 +497,23 @@ function normalizeToolCallNameForDispatch(rawName: string, allowedToolNames?: Se
   if (segments.length > 1) {
     for (let index = 1; index < segments.length; index += 1) {
       const suffix = segments.slice(index).join(".");
-      candidateNames.add(suffix);
-      candidateNames.add(normalizeToolName(suffix));
+      addCandidate(suffix);
+      addCandidate(normalizeToolName(suffix));
     }
   }
 
+  return candidates;
+}
+
+function resolveStructuredAllowedToolName(
+  rawName: string,
+  allowedToolNames?: Set<string>,
+): string | null {
+  if (!allowedToolNames || allowedToolNames.size === 0) {
+    return null;
+  }
+
+  const candidateNames = buildStructuredToolNameCandidates(rawName);
   for (const candidate of candidateNames) {
     if (allowedToolNames.has(candidate)) {
       return candidate;
@@ -457,23 +521,116 @@ function normalizeToolCallNameForDispatch(rawName: string, allowedToolNames?: Se
   }
 
   for (const candidate of candidateNames) {
-    const folded = candidate.toLowerCase();
-    let caseInsensitiveMatch: string | null = null;
-    for (const name of allowedToolNames) {
-      if (name.toLowerCase() !== folded) {
-        continue;
-      }
-      if (caseInsensitiveMatch && caseInsensitiveMatch !== name) {
-        return candidate;
-      }
-      caseInsensitiveMatch = name;
-    }
+    const caseInsensitiveMatch = resolveCaseInsensitiveAllowedToolName(candidate, allowedToolNames);
     if (caseInsensitiveMatch) {
       return caseInsensitiveMatch;
     }
   }
 
-  return trimmed;
+  return null;
+}
+
+function inferToolNameFromToolCallId(
+  rawId: string | undefined,
+  allowedToolNames?: Set<string>,
+): string | null {
+  if (!rawId || !allowedToolNames || allowedToolNames.size === 0) {
+    return null;
+  }
+  const id = rawId.trim();
+  if (!id) {
+    return null;
+  }
+
+  const candidateTokens = new Set<string>();
+  const addToken = (value: string) => {
+    const trimmed = value.trim();
+    if (!trimmed) {
+      return;
+    }
+    candidateTokens.add(trimmed);
+    candidateTokens.add(trimmed.replace(/[:._/-]\d+$/, ""));
+    candidateTokens.add(trimmed.replace(/\d+$/, ""));
+
+    const normalizedDelimiter = trimmed.replace(/\//g, ".");
+    candidateTokens.add(normalizedDelimiter);
+    candidateTokens.add(normalizedDelimiter.replace(/[:._-]\d+$/, ""));
+    candidateTokens.add(normalizedDelimiter.replace(/\d+$/, ""));
+
+    for (const prefixPattern of [/^functions?[._-]?/i, /^tools?[._-]?/i]) {
+      const stripped = normalizedDelimiter.replace(prefixPattern, "");
+      if (stripped !== normalizedDelimiter) {
+        candidateTokens.add(stripped);
+        candidateTokens.add(stripped.replace(/[:._-]\d+$/, ""));
+        candidateTokens.add(stripped.replace(/\d+$/, ""));
+      }
+    }
+  };
+
+  const preColon = id.split(":")[0] ?? id;
+  for (const seed of [id, preColon]) {
+    addToken(seed);
+  }
+
+  let singleMatch: string | null = null;
+  for (const candidate of candidateTokens) {
+    const matched = resolveStructuredAllowedToolName(candidate, allowedToolNames);
+    if (!matched) {
+      continue;
+    }
+    if (singleMatch && singleMatch !== matched) {
+      return null;
+    }
+    singleMatch = matched;
+  }
+
+  return singleMatch;
+}
+
+function looksLikeMalformedToolNameCounter(rawName: string): boolean {
+  const normalizedDelimiter = rawName.trim().replace(/\//g, ".");
+  return (
+    /^(?:functions?|tools?)[._-]?/i.test(normalizedDelimiter) &&
+    /(?:[:._-]\d+|\d+)$/.test(normalizedDelimiter)
+  );
+}
+
+function normalizeToolCallNameForDispatch(
+  rawName: string,
+  allowedToolNames?: Set<string>,
+  rawToolCallId?: string,
+): string {
+  const trimmed = rawName.trim();
+  if (!trimmed) {
+    // Keep whitespace-only placeholders unchanged unless we can safely infer
+    // a canonical name from toolCallId and allowlist.
+    return inferToolNameFromToolCallId(rawToolCallId, allowedToolNames) ?? rawName;
+  }
+  if (!allowedToolNames || allowedToolNames.size === 0) {
+    return trimmed;
+  }
+
+  const exact = resolveExactAllowedToolName(trimmed, allowedToolNames);
+  if (exact) {
+    return exact;
+  }
+  // Some providers put malformed toolCallId-like strings into `name`
+  // itself (for example `functionsread3`). Recover conservatively from the
+  // name token before consulting the separate id so explicit names like
+  // `someOtherTool` are preserved.
+  const inferredFromName = inferToolNameFromToolCallId(trimmed, allowedToolNames);
+  if (inferredFromName) {
+    return inferredFromName;
+  }
+
+  // If the explicit name looks like a provider-mangled tool-call id with a
+  // numeric suffix, fail closed when inference is ambiguous instead of routing
+  // to whichever structured candidate happens to match.
+  if (looksLikeMalformedToolNameCounter(trimmed)) {
+    return trimmed;
+  }
+
+  return resolveStructuredAllowedToolName(trimmed, allowedToolNames) ?? trimmed;
 }
 
 function isToolCallBlockType(type: unknown): boolean {
@@ -549,13 +706,21 @@ function trimWhitespaceFromToolCallNamesInMessage(
     if (!block || typeof block !== "object") {
       continue;
     }
-    const typedBlock = block as { type?: unknown; name?: unknown };
-    if (!isToolCallBlockType(typedBlock.type) || typeof typedBlock.name !== "string") {
+    const typedBlock = block as { type?: unknown; name?: unknown; id?: unknown };
+    if (!isToolCallBlockType(typedBlock.type)) {
       continue;
     }
-    const normalized = normalizeToolCallNameForDispatch(typedBlock.name, allowedToolNames);
-    if (normalized !== typedBlock.name) {
-      typedBlock.name = normalized;
+    const rawId = typeof typedBlock.id === "string" ? typedBlock.id : undefined;
+    if (typeof typedBlock.name === "string") {
+      const normalized = normalizeToolCallNameForDispatch(typedBlock.name, allowedToolNames, rawId);
+      if (normalized !== typedBlock.name) {
+        typedBlock.name = normalized;
+      }
+      continue;
+    }
+    const inferred = inferToolNameFromToolCallId(rawId, allowedToolNames);
+    if (inferred) {
+      typedBlock.name = inferred;
     }
   }
   normalizeToolCallIdsInMessage(message);