continuedev/continue · error · Error

Tool ${toolName} not found

Error message

Tool ${toolName} not found

What it means

After config loads successfully, the preprocessArgs handler looks up the tool by function.name; if no configured tool matches toolName it throws `Tool ${toolName} not found`.

Source

Thrown at core/core.ts:1090

            basePolicy,
            parsedArgs,
            processedArgs,
          );
          return { policy: evaluatedPolicy, displayValue };
        }
        return { policy: basePolicy, displayValue };
      },
    );

    on("tools/preprocessArgs", async ({ data: { toolName, args } }) => {
      const { config } = await this.configHandler.loadConfig();
      if (!config) {
        throw new Error("Config not loaded");
      }

      const tool = config?.tools.find((t) => t.function.name === toolName);
      if (!tool) {
        throw new Error(`Tool ${toolName} not found`);
      }

      try {
        const preprocessedArgs = await tool.preprocessArgs?.(args, {
          ide: this.ide,
        });
        return {
          preprocessedArgs,
        };
      } catch (e) {
        let errorReason =
          e instanceof ContinueError ? e.reason : ContinueErrorReason.Unknown;
        let errorMessage =
          e instanceof Error
            ? e.message
            : `Error preprocessing tool call args for ${toolName}\n${JSON.stringify(args)}`;
        return {
          preprocessedArgs: undefined,

View on GitHub (pinned to 5522c6f44c)

Solutions

1. Verify the exact function.name in config.tools matches toolName
2. Register the custom tool in config before calling
3. Check for typos/casing in the tool name

Example fix

// before
preprocessArgs({ toolName: "read_file", args });
// after
preprocessArgs({ toolName: "readfile", args }); // must equal t.function.name in config

const names = new Set(config.tools.map(t => t.function.name));
if (!names.has(toolName)) throw new RangeError(`unknown tool ${toolName}`);

const isKnownTool = (n: string, c: Config) => c.tools.some(t => t.function.name === n);

catch (e) { if (e.message.endsWith('not found')) { logMisconfiguredTool(e.message); } }

When it happens

Trigger: Calling preprocessArgs with a toolName that isn't in config.tools (typo, unregistered custom tool, tool removed from config).

Common situations: Custom tool not registered in config; renaming a tool; stale tool name from an old session.

Related errors

• Config not loaded
• Tool ${toolCall.function.name} not found
• Profile ${profileId} not found
• No reranker set up
• No chat model selected

AI-assisted analysis of continuedev/continue@5522c6f44c (2026-08-27). Data as JSON: /api/errors/b8814ca42d2a6dbf. Report an issue: GitHub.