Mastra•2mo ago

Tools error when calling from agent

Updated mastra from 0.17.x to latest and am seeing some very odd errors when it tries to execute its first tool in the agent... the agent is planning which tools to call correctly but it just fails immediately upon executing the first tool with an error. This tool requires no input (it dosn't even have an input schema) so I'm sort of at a loss? The tool even has a description that the tool itself takes no parameters.

result: {
    error: true,
    message: 'Tool validation failed for iic_login. Please fix the following errors and try again:\n' +
      '- root: Required\n' +
      '\n' +
      'Provided arguments: undefined',
    validationErrors: { _errors: [Array] }
  },

result: {
    error: true,
    message: 'Tool validation failed for iic_login. Please fix the following errors and try again:\n' +
      '- root: Required\n' +
      '\n' +
      'Provided arguments: undefined',
    validationErrors: { _errors: [Array] }
  },

result: {
    error: true,
    message: 'Tool validation failed for iic_login. Please fix the following errors and try again:\n' +
      '- root: Required\n' +
      '\n' +
      'Provided arguments: undefined',
    validationErrors: { _errors: [Array] }
  },

result: {
    error: true,
    message: 'Tool validation failed for iic_login. Please fix the following errors and try again:\n' +
      '- root: Required\n' +
      '\n' +
      'Provided arguments: undefined',
    validationErrors: { _errors: [Array] }
  },

Mastra Triager•10/28/25, 12:05 PM

Created GitHub issue: https://github.com/mastra-ai/mastra/issues/9384

GitHub

[DISCORD:1432416782349766686] Tools error when calling from agent ...

This issue was created from Discord post: https://discord.com/channels/1309558646228779139/1432416782349766686 Updated mastra from 0.17.x to latest and am seeing some very odd errors when it tries ...

Itay Elgazar•11/8/25, 8:54 AM

any news on this one?

Abhi Aiyer•11/20/25, 1:26 AM

Hi @Itay Elgazar @Exziled do you have a reproduction I could use to figure out whats going on?

ExziledOP•11/20/25, 2:12 AM

I was just using a simple agent with a simple tool that took 0 params.

ExziledOP•11/20/25, 2:13 AM

@Abhi Aiyer pretty sure that’s literally all I had to do. Just create an agent and tell it to use appropriate tools and then provide it a single tool with no inputs required

Abhi Aiyer•11/20/25, 7:48 AM

so empty z.obect({})? or just undefined?

ExziledOP•11/20/25, 11:22 AM

I tried both

ExziledOP•11/20/25, 11:23 AM

No inputschwma provided at all and then gave tone with just an empty object same thing happened

Abhi Aiyer•11/20/25, 3:21 PM

Dope thanks for the info @Exziled, last question what model?

ExziledOP•11/20/25, 3:47 PM

I believe I was using Claude sonnet 4 at the time but if memory serves me correctly, I hit it with multiple different models

Abhi Aiyer•11/20/25, 4:03 PM

thanks dude, ill try and fix this!

_roamin_•11/20/25, 5:22 PM

Hey @Exziled & @Itay Elgazar ! I'm unable to reproduce with latest. I tried with an empty input schema and also no input schema (with a gpt model and a sonnet model).

Could you try with latest and let me know if you're still getting this error? thanks!

ExziledOP•11/20/25, 7:36 PM

I was using 0.20.1 when I encountered it so possibly it's been fixed since then!

ExziledOP•11/20/25, 7:36 PM

and aiai like 5.0.605.0.60

Tools error when calling from agent

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