kepler_candidatesKepler Object of Interest (KOI) candidate table -- unconfirmed candidates, not confirmed planets. Do not use this table's row count to answer a confirmed-planet-count question.
| Name | Required | Description | Default |
|---|---|---|---|
| limit | No | ||
| query | No |
| Name | Required | Description | Default |
|---|---|---|---|
| count | No | ||
| items | No |
Changes observed during successful MCP inspections.
Output schema / properties / bodyRemoved value: -{
- "description": "Non-JSON response body (first 16000 chars)",
- "type": "string"
-}Output schema / properties / countAdded value: +{
+ "type": "number"
+}Output schema / properties / formatRemoved value: -{
- "description": "Response format (json, csv, or votable)",
- "type": "string"
-}Output schema / properties / itemsAdded value: +{
+ "items": {
+ "properties": {
+ "dec": {
+ "type": "number"
+ },
+ "dec_err": {
+ "type": "number"
+ },
+ "dec_str": {
+ "type": "string"
+ },
+ "kepid": {
+ "type": "number"
+ },
+ "kepler_name": {
+ "type": [
+ "string",
+ "null"
+ ]
+ },
+ "kepoi_name": {
+ "type": "string"
+ },
+ "koi_bin_oedp_sig": {
+ "type": [
+ "number",
+ "null"
+ ]
+ },
+ "koi_comment": {
+ "type": [
+ "string",
+ "null"
+ ]
+ },
+ "koi_count": {
+ "type": "number"
+ },
+ "koi_datalink_dvr": {
+ "type": "string"
+ },
+ "koi_datalink_dvs": {
+ "type": "string"
+ },
+ "koi_delivname": {
+ "type": "string"
+ },
+ "koi_depth": {
+ "type": "number"
+ },
+ "koi_depth_err1": {
+ "type": "number"
+ },
+ "koi_depth_err2": {
+ "type": "number"
+ },
+ "koi_dicco_mdec": {
+ "type": "number"
+ },
+ "koi_dicco_mdec_err": {
+ "type": "number"
+ },
+ "koi_dicco_mra": {
+ "type": "number"
+ },
+ "koi_dicco_mra_err": {
+ "type": "number"
+ },
+ "koi_dicco_msky": {
+ "type": "number"
+ },
+ "koi_dicco_msky_err": {
+ "type": "number"
+ },
+ "koi_dikco_mdec": {
+ "type": "number"
+ },
+ "koi_dikco_mdec_err": {
+ "type": "number"
+ },
+ "koi_dikco_mra": {
+ "type": "number"
+ },
+ "koi_dikco_mra_err": {
+ "type": "number"
+ },
+ "koi_dikco_msky": {
+ "type": "number"
+ },
+ "koi_dikco_msky_err": {
+ "type": "number"
+ },
+ "koi_disp_prov": {
+ "type": "string"
+ },
+ "koi_disposition": {
+ "type": "string"
+ },
+ "koi_dor": {
+ "type": "number"
+ },
+ "koi_dor_err1": {
+ "type": "number"
+ },
+ "koi_dor_err2": {
+ "type": "number"
+ },
+ "koi_duration": {
+ "type": "number"
+ },
+ "koi_duration_err1": {
+ "type": "number"
+ },
+ "koi_duration_err2": {
+ "type": "number"
+ },
+ "koi_eccen": {
+ "type": "number"
+ },
+ "koi_eccen_err1": {
+ "type": "null"
+ },
+ "koi_eccen_err2": {
+ "type": "null"
+ },
+ "koi_fittype": {
+ "type": "string"
+ },
+ "koi_fpflag_co": {
+ "type": "number"
+ },
+ "koi_fpflag_ec": {
+ "type": "number"
+ },
+ "koi_fpflag_nt": {
+ "type": "number"
+ },
+ "koi_fpflag_ss": {
+ "type": "number"
+ },
+ "koi_fwm_pdeco": {
+ "type": [
+ "number",
+ "null"
+ ]
+ },
+ "koi_fwm_pdeco_err": {
+ "type": [
+ "number",
+ "null"
+ ]
+ },
+ "koi_fwm_prao": {
+ "type": "number"
+ },
+ "koi_fwm_prao_err": {
+ "type": "number"
+ },
+ "koi_fwm_sdec": {
+ "type": "number"
+ },
+ "koi_fwm_sdec_err": {
+ "type": "number"
+ },
+ "koi_fwm_sdeco": {
+ "type": "number"
+ },
+ "koi_fwm_sdeco_err": {
+ "type": "number"
+ },
+ "koi_fwm_sra": {
+ "type": "number"
+ },
+ "koi_fwm_sra_err": {
+ "type": "number"
+ },
+ "koi_fwm_srao": {
+ "type": "number"
+ },
+ "koi_fwm_srao_err": {
+ "type": "number"
+ },
+ "koi_fwm_stat_sig": {
+ "type": [
+ "number",
+ "null"
+ ]
+ },
+ "koi_gmag": {
+ "type": "number"
+ },
+ "koi_gmag_err": {
+ "type": "null"
+ },
+ "koi_hmag": {
+ "type": "number"
+ },
+ "koi_hmag_err": {
+ "type": "number"
+ },
+ "koi_imag": {
+ "type": "number"
+ },
+ "koi_imag_err": {
+ "type": "null"
+ },
+ "koi_impact": {
+ "type": "number"
+ },
+ "koi_impact_err1": {
+ "type": "number"
+ },
+ "koi_impact_err2": {
+ "type": "number"
+ },
+ "koi_incl": {
+ "type": "number"
+ },
+ "koi_incl_err1": {
+ "type": "null"
+ },
+ "koi_incl_err2": {
+ "type": "null"
+ },
+ "koi_ingress": {
+ "type": "null"
+ },
+ "koi_ingress_err1": {
+ "type": "null"
+ },
+ "koi_ingress_err2": {
+ "type": "null"
+ },
+ "koi_insol": {
+ "type": "number"
+ },
+ "koi_insol_err1": {
+ "type": "number"
+ },
+ "koi_insol_err2": {
+ "type": "number"
+ },
+ "koi_jmag": {
+ "type": "number"
+ },
+ "koi_jmag_err": {
+ "type": "number"
+ },
+ "koi_kepmag": {
+ "type": "number"
+ },
+ "koi_kepmag_err": {
+ "type": "null"
+ },
+ "koi_kmag": {
+ "type": "number"
+ },
+ "koi_kmag_err": {
+ "type": "number"
+ },
+ "koi_ldm_coeff1": {
+ "type": "number"
+ },
+ "koi_ldm_coeff2": {
+ "type": "number"
+ },
+ "koi_ldm_coeff3": {
+ "type": "number"
+ },
+ "koi_ldm_coeff4": {
+ "type": "number"
+ },
+ "koi_limbdark_mod": {
+ "type": "string"
+ },
+ "koi_longp": {
+ "type": "null"
+ },
+ "koi_longp_err1": {
+ "type": "null"
+ },
+ "koi_longp_err2": {
+ "type": "null"
+ },
+ "koi_max_mult_ev": {
+ "type": [
+ "number",
+ "null"
+ ]
+ },
+ "koi_max_sngle_ev": {
+ "type": [
+ "number",
+ "null"
+ ]
+ },
+ "koi_model_chisq": {
+ "type": "null"
+ },
+ "koi_model_dof": {
+ "type": "null"
+ },
+ "koi_model_snr": {
+ "type": "number"
+ },
+ "koi_num_transits": {
+ "type": [
+ "number",
+ "null"
+ ]
+ },
+ "koi_parm_prov": {
+ "type": "string"
+ },
+ "koi_pdisposition": {
+ "type": "string"
+ },
+ "koi_period": {
+ "type": "number"
+ },
+ "koi_period_err1": {
+ "type": "number"
+ },
+ "koi_period_err2": {
+ "type": "number"
+ },
+ "koi_prad": {
+ "type": "number"
+ },
+ "koi_prad_err1": {
+ "type": "number"
+ },
+ "koi_prad_err2": {
+ "type": "number"
+ },
+ "koi_quarters": {
+ "type": [
+ "string",
+ "null"
+ ]
+ },
+ "koi_rmag": {
+ "type": "number"
+ },
+ "koi_rmag_err": {
+ "type": "null"
+ },
+ "koi_ror": {
+ "type": "number"
+ },
+ "koi_ror_err1": {
+ "type": "number"
+ },
+ "koi_ror_err2": {
+ "type": "number"
+ },
+ "koi_sage": {
+ "type": "null"
+ },
+ "koi_sage_err1": {
+ "type": "null"
+ },
+ "koi_sage_err2": {
+ "type": "null"
+ },
+ "koi_score": {
+ "type": [
+ "number",
+ "null"
+ ]
+ },
+ "koi_slogg": {
+ "type": "number"
+ },
+ "koi_slogg_err1": {
+ "type": "number"
+ },
+ "koi_slogg_err2": {
+ "type": "number"
+ },
+ "koi_sma": {
+ "type": "number"
+ },
+ "koi_sma_err1": {
+ "type": "null"
+ },
+ "koi_sma_err2": {
+ "type": "null"
+ },
+ "koi_smass": {
+ "type": "number"
+ },
+ "koi_smass_err1": {
+ "type": "number"
+ },
+ "koi_smass_err2": {
+ "type": "number"
+ },
+ "koi_smet": {
+ "type": "number"
+ },
+ "koi_smet_err1": {
+ "type": "number"
+ },
+ "koi_smet_err2": {
+ "type": "number"
+ },
+ "koi_sparprov": {
+ "type": "string"
+ },
+ "koi_srad": {
+ "type": "number"
+ },
+ "koi_srad_err1": {
+ "type": "number"
+ },
+ "koi_srad_err2": {
+ "type": "number"
+ },
+ "koi_srho": {
+ "type": "number"
+ },
+ "koi_srho_err1": {
+ "type": "number"
+ },
+ "koi_srho_err2": {
+ "type": "number"
+ },
+ "koi_steff": {
+ "type": "number"
+ },
+ "koi_steff_err1": {
+ "type": "number"
+ },
+ "koi_steff_err2": {
+ "type": "number"
+ },
+ "koi_tce_delivname": {
+ "type": "string"
+ },
+ "koi_tce_plnt_num": {
+ "type": "number"
+ },
+ "koi_teq": {
+ "type": "number"
+ },
+ "koi_teq_err1": {
+ "type": "null"
+ },
+ "koi_teq_err2": {
+ "type": "null"
+ },
+ "koi_time0": {
+ "type": "number"
+ },
+ "koi_time0_err1": {
+ "type": "number"
+ },
+ "koi_time0_err2": {
+ "type": "number"
+ },
+ "koi_time0bk": {
+ "type": "number"
+ },
+ "koi_time0bk_err1": {
+ "type": "number"
+ },
+ "koi_time0bk_err2": {
+ "type": "number"
+ },
+ "koi_trans_mod": {
+ "type": "string"
+ },
+ "koi_vet_date": {
+ "type": "string"
+ },
+ "koi_vet_stat": {
+ "type": "string"
+ },
+ "koi_zmag": {
+ "type": "number"
+ },
+ "koi_zmag_err": {
+ "type": "null"
+ },
+ "ra": {
+ "type": "number"
+ },
+ "ra_err": {
+ "type": "number"
+ },
+ "ra_str": {
+ "type": "string"
+ }
+ },
+ "type": "object"
+ },
+ "type": "array"
+}Input schema / examplesAdded value: +[
+ {
+ "query": "koi_disposition = 'CONFIRMED'"
+ },
+ {
+ "limit": 100,
+ "query": "koi_period > 100"
+ }
+]Output schema / (root)Previous value: -nullNew value: +{
+ "description": "Query result from Kepler Object of Interest table",
+ "properties": {
+ "body": {
+ "description": "Non-JSON response body (first 16000 chars)",
+ "type": "string"
+ },
+ "format": {
+ "description": "Response format (json, csv, or votable)",
+ "type": "string"
+ }
+ },
+ "type": "object"
+}Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare read-only, idempotent, non-destructive, and open-world behavior. The description adds important domain semantics: the data is unconfirmed candidates, and its row count must not be used for confirmed-planet counts. No operational details like pagination are given, but the output schema covers returns.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two sentences, front-loaded with the resource definition and then a critical usage warning. There is no filler; every sentence earns its place.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With an output schema and rich annotations, the description covers purpose and a key exclusion, but it omits any guidance on the query parameter syntax or limit behavior. The schema examples provide some help, but the description itself is incomplete for correct invocation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0% for the two parameters (limit, query), and the description says nothing about query syntax, limit behavior, or any parameter meaning. It fails to compensate for the complete lack of schema descriptions, leaving parameter semantics undocumented.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description identifies the resource as the KOI candidate table and distinguishes it from confirmed planets, but it does not use a specific verb like 'query' or 'list' to state the operation. An agent can infer it is a query tool from the schema, yet the description itself is a noun phrase.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
It gives an explicit when-not: do not use this table's row count for confirmed-planet-count questions, which points toward the sibling confirmed_planet_count. Usage for unconfirmed candidates is implied, but there is no positive 'use this when' instruction or named alternative tool.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Add one secure layer between your agents and this server.